<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:95a4a7f8-48bd-48f4-9cd7-eeccdb95f758,g:742a4f4a-5b28-4752-971f-ccf458953a84-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://pwp.com/role/ConsolidatedStatementsofFinancialCondition" xlink:type="simple" xlink:href="pwp-20211231.xsd#ConsolidatedStatementsofFinancialCondition"/>
  <link:calculationLink xlink:role="http://pwp.com/role/ConsolidatedStatementsofFinancialCondition" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_1975da33-fc5e-47df-b35e-e7b71073d2f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_24f154e8-5724-43be-bb02-e93d01ecf1f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1975da33-fc5e-47df-b35e-e7b71073d2f6" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_24f154e8-5724-43be-bb02-e93d01ecf1f3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_a033b337-937b-4800-959d-ad9b461e2572" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1975da33-fc5e-47df-b35e-e7b71073d2f6" xlink:to="loc_us-gaap_CommonStockValue_a033b337-937b-4800-959d-ad9b461e2572" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_ac667f20-91d4-4744-8403-be7ed5417610" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1975da33-fc5e-47df-b35e-e7b71073d2f6" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_ac667f20-91d4-4744-8403-be7ed5417610" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_a3276aa9-e154-4bb1-8c86-81b25fabbb2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1975da33-fc5e-47df-b35e-e7b71073d2f6" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_a3276aa9-e154-4bb1-8c86-81b25fabbb2a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_32e318b8-9eff-4525-8893-29fbd824488e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LimitedPartnersCapitalAccount"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1975da33-fc5e-47df-b35e-e7b71073d2f6" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccount_32e318b8-9eff-4525-8893-29fbd824488e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_46a11b5d-c46d-411d-b0ec-93bb706f6f46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValue"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1975da33-fc5e-47df-b35e-e7b71073d2f6" xlink:to="loc_us-gaap_TreasuryStockValue_46a11b5d-c46d-411d-b0ec-93bb706f6f46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_412396c8-1129-4b95-874b-37fd4e23ee1b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_fffa415a-7f6e-4524-a0ee-2e15c527339c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_412396c8-1129-4b95-874b-37fd4e23ee1b" xlink:to="loc_us-gaap_Liabilities_fffa415a-7f6e-4524-a0ee-2e15c527339c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_39fedf70-4217-4b82-8c6a-5e40d547df9e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_412396c8-1129-4b95-874b-37fd4e23ee1b" xlink:to="loc_us-gaap_CommitmentsAndContingencies_39fedf70-4217-4b82-8c6a-5e40d547df9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_974ae56e-2178-4b0b-80af-667d07f11854" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_412396c8-1129-4b95-874b-37fd4e23ee1b" xlink:to="loc_us-gaap_StockholdersEquity_974ae56e-2178-4b0b-80af-667d07f11854" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_7ad51bb7-7928-45e8-bdae-4e3088958d82" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_412396c8-1129-4b95-874b-37fd4e23ee1b" xlink:to="loc_us-gaap_MinorityInterest_7ad51bb7-7928-45e8-bdae-4e3088958d82" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3795483b-410f-45b9-8321-3a3e5b6d62bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_3795483b-410f-45b9-8321-3a3e5b6d62bc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_f196dba9-75cd-4ee5-87b5-84a12dab0113" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCash"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_RestrictedCash_f196dba9-75cd-4ee5-87b5-84a12dab0113" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_64878e5c-9a38-4069-9096-707feb087ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_AccountsReceivableNet_64878e5c-9a38-4069-9096-707feb087ee3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueFromRelatedParties_81cd7d17-00a9-48a2-80d2-6c7ae08efdcd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DueFromRelatedParties"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_DueFromRelatedParties_81cd7d17-00a9-48a2-80d2-6c7ae08efdcd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_a49f0c38-b801-4900-8d9e-cdecfb8aa102" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_a49f0c38-b801-4900-8d9e-cdecfb8aa102" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_5aa9d776-4a26-4a28-a687-9fe243693895" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_5aa9d776-4a26-4a28-a687-9fe243693895" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_6e6955f4-d194-4283-a803-76f269ff6964" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_Goodwill_6e6955f4-d194-4283-a803-76f269ff6964" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_0b623eb1-39f5-4129-9a82-3d38d607c11f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_0b623eb1-39f5-4129-9a82-3d38d607c11f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_e09a6598-9cbc-413a-94ad-6d946f1a7c49" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_e09a6598-9cbc-413a-94ad-6d946f1a7c49" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_b07abc57-0dd3-4ae8-ab49-2ce3472a5f63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_bcf8a654-ebb5-4012-968d-6df5ac10f847" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_b07abc57-0dd3-4ae8-ab49-2ce3472a5f63" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_6052baea-f038-472e-9d79-aab27efb2e87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_dbf08817-0e6b-490e-a379-1a252b3f6b99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_6052baea-f038-472e-9d79-aab27efb2e87" xlink:to="loc_us-gaap_StockholdersEquity_dbf08817-0e6b-490e-a379-1a252b3f6b99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_1d31f23b-61e9-4941-9d04-754458c686f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_6052baea-f038-472e-9d79-aab27efb2e87" xlink:to="loc_us-gaap_MinorityInterest_1d31f23b-61e9-4941-9d04-754458c686f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_c9665e98-b5ff-4a5c-a5ef-b915cc1e3b91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_c9665e98-b5ff-4a5c-a5ef-b915cc1e3b91" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_7a43431b-ff1b-4d14-ab6e-c2effd8d3fca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_7a43431b-ff1b-4d14-ab6e-c2effd8d3fca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_9eed23dc-ee1a-463f-9a42-601e4fdae51e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_9eed23dc-ee1a-463f-9a42-601e4fdae51e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_f3ec2516-ab41-4dd1-82e0-8f168569c288" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:to="loc_us-gaap_ContractWithCustomerLiability_f3ec2516-ab41-4dd1-82e0-8f168569c288" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_62a615fb-ef46-47b5-8de3-1fe6b04e0ea5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:to="loc_us-gaap_OperatingLeaseLiability_62a615fb-ef46-47b5-8de3-1fe6b04e0ea5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_4a92c664-43a4-421b-8efa-dd31e00121e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:to="loc_us-gaap_LongTermDebt_4a92c664-43a4-421b-8efa-dd31e00121e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_f1d5e4af-aa8e-4300-9732-03df6ad3b6c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:to="loc_us-gaap_DerivativeLiabilities_f1d5e4af-aa8e-4300-9732-03df6ad3b6c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_938a211e-d85f-4ba3-ae2c-37e2397dc08b" xlink:href="pwp-20211231.xsd#pwp_AmountDuePursuantToTaxReceivableAgreement"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e032276-0f34-4d50-8b03-e0cf3fcb6478" xlink:to="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_938a211e-d85f-4ba3-ae2c-37e2397dc08b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/ConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="pwp-20211231.xsd#ConsolidatedStatementsofOperations"/>
  <link:calculationLink xlink:role="http://pwp.com/role/ConsolidatedStatementsofOperations" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_1692f052-fbbb-4677-b8be-9357b0c39f69" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_abd79043-cdba-4388-a37d-241f91abfc99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_1692f052-fbbb-4677-b8be-9357b0c39f69" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_abd79043-cdba-4388-a37d-241f91abfc99" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty_035e670e-acfb-4650-8247-8bc13a992f42" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_1692f052-fbbb-4677-b8be-9357b0c39f69" xlink:to="loc_us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty_035e670e-acfb-4650-8247-8bc13a992f42" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_cc790dc3-6de8-4746-98f8-2a6869f1f796" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_1692f052-fbbb-4677-b8be-9357b0c39f69" xlink:to="loc_us-gaap_InterestExpense_cc790dc3-6de8-4746-98f8-2a6869f1f796" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_2624877b-e8fa-4296-be5a-5e2804676eb9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_1692f052-fbbb-4677-b8be-9357b0c39f69" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_2624877b-e8fa-4296-be5a-5e2804676eb9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_82a39fba-4cd1-4a1c-9933-2ccc99f6164e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_1692f052-fbbb-4677-b8be-9357b0c39f69" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_82a39fba-4cd1-4a1c-9933-2ccc99f6164e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f1ea16c5-d667-49f5-a595-de0bf13c015a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_27bf4c21-a1cd-498a-8a6a-db949ee14cb4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_f1ea16c5-d667-49f5-a595-de0bf13c015a" xlink:to="loc_us-gaap_ProfitLoss_27bf4c21-a1cd-498a-8a6a-db949ee14cb4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_97454c70-323d-45df-9c7e-f4de00a72dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_f1ea16c5-d667-49f5-a595-de0bf13c015a" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_97454c70-323d-45df-9c7e-f4de00a72dd1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_ac86cf29-a307-4f8e-8088-41ef72d46eb9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_4a18a3b7-7822-4669-9ed0-88623491d025" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_ac86cf29-a307-4f8e-8088-41ef72d46eb9" xlink:to="loc_us-gaap_OperatingIncomeLoss_4a18a3b7-7822-4669-9ed0-88623491d025" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_a541856a-4936-4089-a0a6-ad8dcede71d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_ac86cf29-a307-4f8e-8088-41ef72d46eb9" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_a541856a-4936-4089-a0a6-ad8dcede71d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_c4754584-88c3-49b5-8691-d6156380f771" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_1e2adc04-3283-45cf-b230-f5055e71c5fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_c4754584-88c3-49b5-8691-d6156380f771" xlink:to="loc_us-gaap_LaborAndRelatedExpense_1e2adc04-3283-45cf-b230-f5055e71c5fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_0846653a-f0d8-4c9b-88a3-fb9392285f1e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfessionalFees"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_c4754584-88c3-49b5-8691-d6156380f771" xlink:to="loc_us-gaap_ProfessionalFees_0846653a-f0d8-4c9b-88a3-fb9392285f1e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_9ff0a311-3d6b-4841-bf78-dad672e75414" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommunicationsAndInformationTechnology"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_c4754584-88c3-49b5-8691-d6156380f771" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_9ff0a311-3d6b-4841-bf78-dad672e75414" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_97d45cfd-9cd2-46f0-826e-ef6a593306dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OccupancyNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_c4754584-88c3-49b5-8691-d6156380f771" xlink:to="loc_us-gaap_OccupancyNet_97d45cfd-9cd2-46f0-826e-ef6a593306dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TravelAndEntertainmentExpense_0475b2e4-c0e4-473c-a5e3-7450dad42079" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TravelAndEntertainmentExpense"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_c4754584-88c3-49b5-8691-d6156380f771" xlink:to="loc_us-gaap_TravelAndEntertainmentExpense_0475b2e4-c0e4-473c-a5e3-7450dad42079" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_28cdf03a-b5eb-4170-9c60-f2a5c40f3581" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_c4754584-88c3-49b5-8691-d6156380f771" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_28cdf03a-b5eb-4170-9c60-f2a5c40f3581" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_3cf2edc8-91b8-4851-b2b2-81dc8f2f7b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_c4754584-88c3-49b5-8691-d6156380f771" xlink:to="loc_us-gaap_DepreciationAndAmortization_3cf2edc8-91b8-4851-b2b2-81dc8f2f7b7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_5cd008c1-43d1-4c1b-b98b-b146566e6461" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_CompensationExpenseExcludingEquityBasedCompensation_2aeea838-f46e-4c45-ba7f-c1f19ad05b83" xlink:href="pwp-20211231.xsd#pwp_CompensationExpenseExcludingEquityBasedCompensation"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LaborAndRelatedExpense_5cd008c1-43d1-4c1b-b98b-b146566e6461" xlink:to="loc_pwp_CompensationExpenseExcludingEquityBasedCompensation_2aeea838-f46e-4c45-ba7f-c1f19ad05b83" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_2b56dade-9c8f-48ef-8228-2bab0ecb96e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LaborAndRelatedExpense_5cd008c1-43d1-4c1b-b98b-b146566e6461" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_2b56dade-9c8f-48ef-8228-2bab0ecb96e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_9bc7dceb-38b6-4682-8569-e3d856c3c919" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f43efdb3-3ee8-4d97-b595-74ac9f049e5d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9bc7dceb-38b6-4682-8569-e3d856c3c919" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f43efdb3-3ee8-4d97-b595-74ac9f049e5d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_6e72896c-3375-4b8b-800b-dbd0b94383ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9bc7dceb-38b6-4682-8569-e3d856c3c919" xlink:to="loc_us-gaap_OperatingExpenses_6e72896c-3375-4b8b-800b-dbd0b94383ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_2b23aeca-bb51-4b34-8211-6dfe3ab3acb2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_1e800609-3e53-4db5-af0c-78c31cc8ad20" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_2b23aeca-bb51-4b34-8211-6dfe3ab3acb2" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_1e800609-3e53-4db5-af0c-78c31cc8ad20" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_c7299601-d74e-43c0-a0cb-ba9ad9282dda" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_2b23aeca-bb51-4b34-8211-6dfe3ab3acb2" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_c7299601-d74e-43c0-a0cb-ba9ad9282dda" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/ConsolidatedStatementsofComprehensiveIncomeLoss" xlink:type="simple" xlink:href="pwp-20211231.xsd#ConsolidatedStatementsofComprehensiveIncomeLoss"/>
  <link:calculationLink xlink:role="http://pwp.com/role/ConsolidatedStatementsofComprehensiveIncomeLoss" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_7bea0eb7-efd9-4188-a544-563e11942cc2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_2bd0471b-0783-4ebb-9546-a8e1470d1b22" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_7bea0eb7-efd9-4188-a544-563e11942cc2" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_2bd0471b-0783-4ebb-9546-a8e1470d1b22" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_c09e063e-ca98-4260-ac47-a0e0bc3b15ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_7bea0eb7-efd9-4188-a544-563e11942cc2" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_c09e063e-ca98-4260-ac47-a0e0bc3b15ee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_7ef4c2e5-ca99-412b-9ae0-d45a67fa6472" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_c27e59c2-6633-4e0f-80be-4f6e42835925" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_7ef4c2e5-ca99-412b-9ae0-d45a67fa6472" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_c27e59c2-6633-4e0f-80be-4f6e42835925" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_8809828a-f9eb-4525-8ea2-5929977d3aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_7ef4c2e5-ca99-412b-9ae0-d45a67fa6472" xlink:to="loc_us-gaap_ProfitLoss_8809828a-f9eb-4525-8ea2-5929977d3aa0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="pwp-20211231.xsd#ConsolidatedStatementsofCashFlows"/>
  <link:calculationLink xlink:role="http://pwp.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_8aafd883-5a8f-4c4f-af3c-cc134ea08655" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_8aafd883-5a8f-4c4f-af3c-cc134ea08655" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_f752375c-ddd7-42b5-b7eb-93b0e12dea54" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_f752375c-ddd7-42b5-b7eb-93b0e12dea54" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_37c11427-8d20-4200-b3b7-7d18c6de6256" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_37c11427-8d20-4200-b3b7-7d18c6de6256" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_750d6df3-bef9-44cb-b066-18e3a2dafae6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_750d6df3-bef9-44cb-b066-18e3a2dafae6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_0e7b03bd-ebe2-4ebf-bea5-73765cca7d79" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_ShareBasedCompensation_0e7b03bd-ebe2-4ebf-bea5-73765cca7d79" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_928be881-09c1-4edf-9d69-7c1f19c4bd9f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_928be881-09c1-4edf-9d69-7c1f19c4bd9f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrent_accce799-437f-4e3d-a691-05ccf060ecba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrent"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrent_accce799-437f-4e3d-a691-05ccf060ecba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_b9b907c1-e460-401e-8c82-ab3819bd2b25" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_b9b907c1-e460-401e-8c82-ab3819bd2b25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_2a6a5172-fe06-45ec-936f-00ea76032be1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_2a6a5172-fe06-45ec-936f-00ea76032be1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_6ae00df9-29ea-4e0d-b08b-cf67a440df14" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_ProfitLoss_6ae00df9-29ea-4e0d-b08b-cf67a440df14" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_5f63f966-180c-4671-a3ca-3b3856104b6f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_5f63f966-180c-4671-a3ca-3b3856104b6f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredCompensation_b4ee8c49-d974-4f86-bd8f-34e2232ca646" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredCompensation"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredCompensation_b4ee8c49-d974-4f86-bd8f-34e2232ca646" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_67c4d751-1c5c-4643-974a-488e1f71d541" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_67c4d751-1c5c-4643-974a-488e1f71d541" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_93270455-a6be-4e2c-b286-2326d5654ef4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAdjustmentOfWarrants"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_FairValueAdjustmentOfWarrants_93270455-a6be-4e2c-b286-2326d5654ef4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_59b94bfc-d30d-40b1-acae-28f8344a53d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="15" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_59b94bfc-d30d-40b1-acae-28f8344a53d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6c2823f0-ba99-4471-bc93-d336d4a61455" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6c2823f0-ba99-4471-bc93-d336d4a61455" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_fd53a1e3-ee9a-4980-ac50-d6bfdfe0a442" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_DepreciationAndAmortization_fd53a1e3-ee9a-4980-ac50-d6bfdfe0a442" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_550fa7f3-c436-4bbf-a02f-b14a1bc789f0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:calculationArc order="18" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_73e44b2a-723f-433c-8cea-5dd3d629e5bf" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_550fa7f3-c436-4bbf-a02f-b14a1bc789f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_08b95184-9a61-4b52-8f11-ae75b46963a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9afed488-7d34-4166-bf94-a7a9d33521b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_08b95184-9a61-4b52-8f11-ae75b46963a1" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9afed488-7d34-4166-bf94-a7a9d33521b4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_3d09ff13-3150-4e40-9b67-257dab5e9287" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_08b95184-9a61-4b52-8f11-ae75b46963a1" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_3d09ff13-3150-4e40-9b67-257dab5e9287" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0e7f9210-6254-435a-9389-140cf993555f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_08b95184-9a61-4b52-8f11-ae75b46963a1" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_0e7f9210-6254-435a-9389-140cf993555f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4f06a905-8566-499b-a828-12349e15b069" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_08b95184-9a61-4b52-8f11-ae75b46963a1" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4f06a905-8566-499b-a828-12349e15b069" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfMergerRelatedCostsFinancingActivities_e191b818-b6a3-440e-a6b8-719e7fb7a254" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfMergerRelatedCostsFinancingActivities"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_PaymentsOfMergerRelatedCostsFinancingActivities_e191b818-b6a3-440e-a6b8-719e7fb7a254" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_60579baa-698d-46fb-8a68-ac12f2b7f556" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_60579baa-698d-46fb-8a68-ac12f2b7f556" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_RedemptionOfPartnersInterest_4d9fe015-6a5b-4bef-9594-e1c40f14400e" xlink:href="pwp-20211231.xsd#pwp_RedemptionOfPartnersInterest"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_pwp_RedemptionOfPartnersInterest_4d9fe015-6a5b-4bef-9594-e1c40f14400e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquity_fb7baa3e-16b4-40aa-b167-4ffeee1bc7fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRepurchaseOfEquity"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquity_fb7baa3e-16b4-40aa-b167-4ffeee1bc7fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfCapitalDistribution_a557900e-7123-4cf8-8d23-7ec97f1619c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfCapitalDistribution"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_PaymentsOfCapitalDistribution_a557900e-7123-4cf8-8d23-7ec97f1619c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt_d23da007-bdee-4700-817f-eba479604890" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfRelatedPartyDebt_d23da007-bdee-4700-817f-eba479604890" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_1c78f606-4556-493c-903e-278315fdabe0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_1c78f606-4556-493c-903e-278315fdabe0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_4c0336c0-c71b-401c-9c3d-6b9a6cdfa911" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_4c0336c0-c71b-401c-9c3d-6b9a6cdfa911" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_ProceedsFromBusinessCombination_8e4a0f59-999d-4854-b4d2-41d2313be65c" xlink:href="pwp-20211231.xsd#pwp_ProceedsFromBusinessCombination"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_pwp_ProceedsFromBusinessCombination_8e4a0f59-999d-4854-b4d2-41d2313be65c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_9c9471b0-23e3-42ed-a8b1-0ed28f5b167c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_9c9471b0-23e3-42ed-a8b1-0ed28f5b167c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_07197041-fa72-4c10-bba1-a0777c264943" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_07197041-fa72-4c10-bba1-a0777c264943" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_26634816-fb61-4627-a145-9e7d050d8909" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_26634816-fb61-4627-a145-9e7d050d8909" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_fca8d661-2782-4e2b-8bf6-4edb55ee80a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_672c80a9-7bf6-4b72-9fb5-97cc9f3cafb3" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_fca8d661-2782-4e2b-8bf6-4edb55ee80a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cced4723-0244-4871-80e1-31605e79b039" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_b82f26b3-70fe-4f47-828e-f014d54f032a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cced4723-0244-4871-80e1-31605e79b039" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_b82f26b3-70fe-4f47-828e-f014d54f032a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLifeInsurancePolicies_32cbd030-9799-4647-8334-17da54749d37" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromLifeInsurancePolicies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cced4723-0244-4871-80e1-31605e79b039" xlink:to="loc_us-gaap_ProceedsFromLifeInsurancePolicies_32cbd030-9799-4647-8334-17da54749d37" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_be5c470b-d154-4d92-af49-1584df2074ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cced4723-0244-4871-80e1-31605e79b039" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_be5c470b-d154-4d92-af49-1584df2074ce" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/SummaryofSignificantAccountingPoliciesReconciliationofCashCashEquivalentsandRestrictedCashDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#SummaryofSignificantAccountingPoliciesReconciliationofCashCashEquivalentsandRestrictedCashDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/SummaryofSignificantAccountingPoliciesReconciliationofCashCashEquivalentsandRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_eeabc0f0-282c-481c-b200-42077604d915" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_043f45c1-52cb-4711-8f92-f3d38b35934b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Cash"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_eeabc0f0-282c-481c-b200-42077604d915" xlink:to="loc_us-gaap_Cash_043f45c1-52cb-4711-8f92-f3d38b35934b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashEquivalentsAtCarryingValue_2f8c2660-569a-403a-a64b-c2ac774db681" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_eeabc0f0-282c-481c-b200-42077604d915" xlink:to="loc_us-gaap_CashEquivalentsAtCarryingValue_2f8c2660-569a-403a-a64b-c2ac774db681" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_47828220-a178-4576-baf4-11da6a889c05" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCash"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_eeabc0f0-282c-481c-b200-42077604d915" xlink:to="loc_us-gaap_RestrictedCash_47828220-a178-4576-baf4-11da6a889c05" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/LeasesSummaryofOperatingLeasesDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#LeasesSummaryofOperatingLeasesDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/LeasesSummaryofOperatingLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_693631e9-f816-4494-83d1-5ca5dcc15006" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_0291cdec-8a11-48ce-ace8-2499636333b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_693631e9-f816-4494-83d1-5ca5dcc15006" xlink:to="loc_us-gaap_OperatingLeaseCost_0291cdec-8a11-48ce-ace8-2499636333b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_16ab079e-4524-4ae5-9188-001b8938b922" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_693631e9-f816-4494-83d1-5ca5dcc15006" xlink:to="loc_us-gaap_VariableLeaseCost_16ab079e-4524-4ae5-9188-001b8938b922" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_58ff69e9-db03-4e87-820d-cf064419ed24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubleaseIncome"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_693631e9-f816-4494-83d1-5ca5dcc15006" xlink:to="loc_us-gaap_SubleaseIncome_58ff69e9-db03-4e87-820d-cf064419ed24" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/LeasesScheduleofOperatingLeaseMaturitiesDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#LeasesScheduleofOperatingLeaseMaturitiesDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/LeasesScheduleofOperatingLeaseMaturitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearThree_255999bf-1a04-4eb7-bf3a-9f2ffcad989c" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearThree"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearThree_cd352da3-9149-4d38-8ce4-e1eb12a607fc" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearThree"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearThree_255999bf-1a04-4eb7-bf3a-9f2ffcad989c" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearThree_cd352da3-9149-4d38-8ce4-e1eb12a607fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_720fc8da-a543-408d-9c27-c1d5c675525e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearThree_255999bf-1a04-4eb7-bf3a-9f2ffcad989c" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_720fc8da-a543-408d-9c27-c1d5c675525e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueAfterYearFive_40264001-7090-458e-ab59-667411a43415" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueAfterYearFive"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_b2e50150-45a9-4aee-8d2e-7bb4b332d394" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueAfterYearFive_40264001-7090-458e-ab59-667411a43415" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_b2e50150-45a9-4aee-8d2e-7bb4b332d394" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedAfterYearFive_21ebfb31-9f2a-4751-a7fb-6cc5100ee83a" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedAfterYearFive"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueAfterYearFive_40264001-7090-458e-ab59-667411a43415" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedAfterYearFive_21ebfb31-9f2a-4751-a7fb-6cc5100ee83a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDue_d9bea6bd-b532-416b-8384-a506fcf6d373" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFive_416fd8cb-dbc2-487c-8b3e-ce64f92c27f5" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDue_d9bea6bd-b532-416b-8384-a506fcf6d373" xlink:to="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFive_416fd8cb-dbc2-487c-8b3e-ce64f92c27f5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearThree_fc9877da-ea12-44a2-bb8b-7ea12721c9df" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearThree"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDue_d9bea6bd-b532-416b-8384-a506fcf6d373" xlink:to="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearThree_fc9877da-ea12-44a2-bb8b-7ea12721c9df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearTwo_7caf9f9f-1835-47bb-a00b-c8ad1b82557b" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDue_d9bea6bd-b532-416b-8384-a506fcf6d373" xlink:to="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearTwo_7caf9f9f-1835-47bb-a00b-c8ad1b82557b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFour_a8b1ba4c-e277-4783-acaa-dfd6136308a2" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDue_d9bea6bd-b532-416b-8384-a506fcf6d373" xlink:to="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFour_a8b1ba4c-e277-4783-acaa-dfd6136308a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueAfterYearFive_6cf74324-8474-4a00-a044-2f98cb2281b0" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueAfterYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDue_d9bea6bd-b532-416b-8384-a506fcf6d373" xlink:to="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueAfterYearFive_6cf74324-8474-4a00-a044-2f98cb2281b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearOne_80e5d4af-73d6-430d-8bfc-235d59d6187f" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearOne"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDue_d9bea6bd-b532-416b-8384-a506fcf6d373" xlink:to="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearOne_80e5d4af-73d6-430d-8bfc-235d59d6187f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFive_ecaa4b64-1b6b-4af5-b910-6334b1e779f6" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFive"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFive_e731edbe-601d-49cf-84c2-01e70028834c" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFive"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFive_ecaa4b64-1b6b-4af5-b910-6334b1e779f6" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFive_e731edbe-601d-49cf-84c2-01e70028834c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_4eed4a85-d571-41c0-a6f5-a4107147dd4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFive_ecaa4b64-1b6b-4af5-b910-6334b1e779f6" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_4eed4a85-d571-41c0-a6f5-a4107147dd4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_24b6ebf4-52f3-41a9-ab81-89e6b791fbb6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_669a9b35-eefd-46a3-834e-c8413e990d20" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_24b6ebf4-52f3-41a9-ab81-89e6b791fbb6" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_669a9b35-eefd-46a3-834e-c8413e990d20" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_c540d0bb-c21c-4856-a049-9feb56aaf689" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_24b6ebf4-52f3-41a9-ab81-89e6b791fbb6" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_c540d0bb-c21c-4856-a049-9feb56aaf689" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_7ec32b85-ee2b-4d98-91dc-cc0bba3352b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_24b6ebf4-52f3-41a9-ab81-89e6b791fbb6" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_7ec32b85-ee2b-4d98-91dc-cc0bba3352b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_014b42ee-fe5f-4fe8-b917-8ec8c7a78121" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_24b6ebf4-52f3-41a9-ab81-89e6b791fbb6" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_014b42ee-fe5f-4fe8-b917-8ec8c7a78121" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_ded9c4a0-cf99-4911-beb8-aae093ccf692" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_24b6ebf4-52f3-41a9-ab81-89e6b791fbb6" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_ded9c4a0-cf99-4911-beb8-aae093ccf692" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_a05fcc35-4e0f-4b36-b12d-54b58bbfbcbe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_24b6ebf4-52f3-41a9-ab81-89e6b791fbb6" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_a05fcc35-4e0f-4b36-b12d-54b58bbfbcbe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFour_863c047a-b59e-4cbd-93eb-ce3f2c58f91c" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFour"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_b6b0b4ea-1fc9-462f-bd9b-1f4c27c5f919" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFour_863c047a-b59e-4cbd-93eb-ce3f2c58f91c" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_b6b0b4ea-1fc9-462f-bd9b-1f4c27c5f919" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFour_355100d9-2d56-4ec9-ad40-6953a8acf86c" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFour"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearFour_863c047a-b59e-4cbd-93eb-ce3f2c58f91c" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFour_355100d9-2d56-4ec9-ad40-6953a8acf86c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceived_d786f6c0-6f20-4b2a-b4f4-0b6e80ccba34" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceived"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearThree_4b8508eb-1517-4f54-8892-bcfc263590dd" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearThree"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceived_d786f6c0-6f20-4b2a-b4f4-0b6e80ccba34" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearThree_4b8508eb-1517-4f54-8892-bcfc263590dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFour_81ea9bb4-3a18-4537-bc72-996bd27a2ecb" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFour"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceived_d786f6c0-6f20-4b2a-b4f4-0b6e80ccba34" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFour_81ea9bb4-3a18-4537-bc72-996bd27a2ecb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFive_7bb47e32-05d3-47cb-8dc7-9a9054bd8252" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFive"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceived_d786f6c0-6f20-4b2a-b4f4-0b6e80ccba34" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearFive_7bb47e32-05d3-47cb-8dc7-9a9054bd8252" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedAfterYearFive_b3305cc1-6df3-413e-8b19-b3c9ae4b5fc1" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedAfterYearFive"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceived_d786f6c0-6f20-4b2a-b4f4-0b6e80ccba34" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedAfterYearFive_b3305cc1-6df3-413e-8b19-b3c9ae4b5fc1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearTwo_5e2ab5fe-1360-4def-9749-558917a30f0a" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearTwo"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceived_d786f6c0-6f20-4b2a-b4f4-0b6e80ccba34" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearTwo_5e2ab5fe-1360-4def-9749-558917a30f0a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearOne_b45c5528-ab9e-4260-ab31-43b7f239bcee" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearOne"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceived_d786f6c0-6f20-4b2a-b4f4-0b6e80ccba34" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearOne_b45c5528-ab9e-4260-ab31-43b7f239bcee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearTwo_6544afce-e8b2-40ef-b3d2-fb8a80a27392" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearTwo"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_c20dcaa7-3044-4a52-95d1-602dc51e8bf7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearTwo_6544afce-e8b2-40ef-b3d2-fb8a80a27392" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_c20dcaa7-3044-4a52-95d1-602dc51e8bf7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearTwo_78f5064f-e288-4c26-b124-6c756497782b" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearTwo"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearTwo_6544afce-e8b2-40ef-b3d2-fb8a80a27392" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearTwo_78f5064f-e288-4c26-b124-6c756497782b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearOne_e95afa17-295d-463f-9c81-ffa343f35b5a" xlink:href="pwp-20211231.xsd#pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearOne"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_f3a21f52-911c-41b7-a162-8dda958d8606" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearOne_e95afa17-295d-463f-9c81-ffa343f35b5a" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_f3a21f52-911c-41b7-a162-8dda958d8606" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearOne_213fc5e7-723a-42d2-8ad2-9baced9820d8" xlink:href="pwp-20211231.xsd#pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearOne"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_OperatingLeaseLiabilitiesNetMinimumPaymentsDueYearOne_e95afa17-295d-463f-9c81-ffa343f35b5a" xlink:to="loc_pwp_LessorSubleaseRentalsPaymentsToBeReceivedYearOne_213fc5e7-723a-42d2-8ad2-9baced9820d8" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/LeasesScheduleofOperatingLeaseMaturitiesDetails_1" xlink:type="simple" xlink:href="pwp-20211231.xsd#LeasesScheduleofOperatingLeaseMaturitiesDetails_1"/>
  <link:calculationLink xlink:role="http://pwp.com/role/LeasesScheduleofOperatingLeaseMaturitiesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_6b37cea8-fa85-459b-a67e-b10d18d6e753" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_6a453d6e-66c3-4e3f-a48d-1700ba1984d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_6b37cea8-fa85-459b-a67e-b10d18d6e753" xlink:to="loc_us-gaap_OperatingLeaseLiability_6a453d6e-66c3-4e3f-a48d-1700ba1984d3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_ae01a160-3f9f-4f93-a7c7-d19d2eb26a30" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_6b37cea8-fa85-459b-a67e-b10d18d6e753" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_ae01a160-3f9f-4f93-a7c7-d19d2eb26a30" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/GoodwillandIntangibleAssetsSummaryofComponentsofGrossandNetIntangibleAssetDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#GoodwillandIntangibleAssetsSummaryofComponentsofGrossandNetIntangibleAssetDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/GoodwillandIntangibleAssetsSummaryofComponentsofGrossandNetIntangibleAssetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_b357d075-04af-4110-a38b-cc72802c196e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2a852a20-e1b2-4d24-958c-27803383f1c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_b357d075-04af-4110-a38b-cc72802c196e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_2a852a20-e1b2-4d24-958c-27803383f1c5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_a42c2d25-f569-4024-8ff7-89d2123f40ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_b357d075-04af-4110-a38b-cc72802c196e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_a42c2d25-f569-4024-8ff7-89d2123f40ab" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/FixedAssetsSummaryofFixedAssetsDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#FixedAssetsSummaryofFixedAssetsDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/FixedAssetsSummaryofFixedAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_32695da6-f1d9-4654-be6a-9a034b63af9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_bba9eebc-cfe8-4586-9920-c2f0acd94fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_32695da6-f1d9-4654-be6a-9a034b63af9b" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_bba9eebc-cfe8-4586-9920-c2f0acd94fb2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_ca02a9de-b536-4489-8d59-627ccb14ab6c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_32695da6-f1d9-4654-be6a-9a034b63af9b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_ca02a9de-b536-4489-8d59-627ccb14ab6c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/IncomeTaxesComponentsofIncomeLossBeforeIncomeTaxesDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#IncomeTaxesComponentsofIncomeLossBeforeIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/IncomeTaxesComponentsofIncomeLossBeforeIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a84f4079-9771-4975-a217-9ba1c7ec1e2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_f5c5f68b-6f27-4218-acf6-629322c91341" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a84f4079-9771-4975-a217-9ba1c7ec1e2b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_f5c5f68b-6f27-4218-acf6-629322c91341" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_ee6f644f-d5a9-467d-9606-83cb1aafdbc1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a84f4079-9771-4975-a217-9ba1c7ec1e2b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_ee6f644f-d5a9-467d-9606-83cb1aafdbc1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/IncomeTaxesCurrentandDeferredComponentsofIncomeTaxProvisionDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#IncomeTaxesCurrentandDeferredComponentsofIncomeTaxProvisionDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/IncomeTaxesCurrentandDeferredComponentsofIncomeTaxProvisionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_4df8d5dd-ddca-48c8-8193-d8efd37db882" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_c6e1663b-903d-4888-829e-78ecdcc80cf8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_4df8d5dd-ddca-48c8-8193-d8efd37db882" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_c6e1663b-903d-4888-829e-78ecdcc80cf8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_14660cdc-5ba6-4f1e-b0e2-b51fbbe6eb77" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_4df8d5dd-ddca-48c8-8193-d8efd37db882" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_14660cdc-5ba6-4f1e-b0e2-b51fbbe6eb77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_809e7306-f6b2-4bd3-a7a8-1496083e05c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_4df8d5dd-ddca-48c8-8193-d8efd37db882" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_809e7306-f6b2-4bd3-a7a8-1496083e05c2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_66d63f8c-4385-44fa-a111-7bddca4f620f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_75c3fcb2-226a-472c-8239-50d589c78d72" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_66d63f8c-4385-44fa-a111-7bddca4f620f" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_75c3fcb2-226a-472c-8239-50d589c78d72" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_8d47da62-1925-41bf-8940-adca1bcd7516" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_66d63f8c-4385-44fa-a111-7bddca4f620f" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_8d47da62-1925-41bf-8940-adca1bcd7516" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_2957f31f-7a60-4174-ae34-1fb32990b6a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_66d63f8c-4385-44fa-a111-7bddca4f620f" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_2957f31f-7a60-4174-ae34-1fb32990b6a0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_38360e16-8c1a-4e1e-9b57-199cd6de65b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_77e5da54-93d5-4880-af29-57acc2c8b6e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_38360e16-8c1a-4e1e-9b57-199cd6de65b2" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_77e5da54-93d5-4880-af29-57acc2c8b6e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_d71d8bb2-4d0e-4373-8fb6-fa561acfd3eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_38360e16-8c1a-4e1e-9b57-199cd6de65b2" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_d71d8bb2-4d0e-4373-8fb6-fa561acfd3eb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/IncomeTaxesReconciliationtoEffectiveIncomeTaxRateDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#IncomeTaxesReconciliationtoEffectiveIncomeTaxRateDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/IncomeTaxesReconciliationtoEffectiveIncomeTaxRateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_15913e88-1054-4175-830b-e62534be5cb2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome_717207ca-c9d3-459b-acb6-d547df504f36" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_15913e88-1054-4175-830b-e62534be5cb2" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome_717207ca-c9d3-459b-acb6-d547df504f36" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_ee2aee15-06a0-40d8-9967-4129df28d147" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_15913e88-1054-4175-830b-e62534be5cb2" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_ee2aee15-06a0-40d8-9967-4129df28d147" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_bee8b77e-2f1e-4f92-bf72-b845eeb602af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_15913e88-1054-4175-830b-e62534be5cb2" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_bee8b77e-2f1e-4f92-bf72-b845eeb602af" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_c481a16f-bf08-418d-b9c0-130e77049666" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_15913e88-1054-4175-830b-e62534be5cb2" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_c481a16f-bf08-418d-b9c0-130e77049666" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther_44d409a0-1007-4e55-b3fe-bd8a6c2528b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_15913e88-1054-4175-830b-e62534be5cb2" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther_44d409a0-1007-4e55-b3fe-bd8a6c2528b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_e6ad7989-bdc6-488c-8346-49c280d5289f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_15913e88-1054-4175-830b-e62534be5cb2" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_e6ad7989-bdc6-488c-8346-49c280d5289f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_6603257c-19cf-405e-ae37-decf6b32795a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_15913e88-1054-4175-830b-e62534be5cb2" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_6603257c-19cf-405e-ae37-decf6b32795a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_98b9f462-1cd9-4e7a-8df5-43106d12312d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_00303079-ab3d-40b4-8f93-f2542c6c3c45" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_98b9f462-1cd9-4e7a-8df5-43106d12312d" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_00303079-ab3d-40b4-8f93-f2542c6c3c45" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_9d120e05-5f46-48b2-8440-b06f01551d6f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_98b9f462-1cd9-4e7a-8df5-43106d12312d" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_9d120e05-5f46-48b2-8440-b06f01551d6f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_5d2dfbcb-096f-4400-97fc-01590949feb0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_51e2436f-7145-494e-b701-0071a02d5ba5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_5d2dfbcb-096f-4400-97fc-01590949feb0" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_51e2436f-7145-494e-b701-0071a02d5ba5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits_d6eecdb2-2856-4870-a8ac-988506863c6d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_5d2dfbcb-096f-4400-97fc-01590949feb0" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits_d6eecdb2-2856-4870-a8ac-988506863c6d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_DeferredTaxAssetsOperatingLeaseLiabilities_5612992d-4f51-4d19-91be-fac073ceeb5f" xlink:href="pwp-20211231.xsd#pwp_DeferredTaxAssetsOperatingLeaseLiabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_5d2dfbcb-096f-4400-97fc-01590949feb0" xlink:to="loc_pwp_DeferredTaxAssetsOperatingLeaseLiabilities_5612992d-4f51-4d19-91be-fac073ceeb5f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_DeferredTaxAssetsDueToStepUpAndDifferenceInBasis_c4509512-8b9c-4845-ae09-b16af220b06b" xlink:href="pwp-20211231.xsd#pwp_DeferredTaxAssetsDueToStepUpAndDifferenceInBasis"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_5d2dfbcb-096f-4400-97fc-01590949feb0" xlink:to="loc_pwp_DeferredTaxAssetsDueToStepUpAndDifferenceInBasis_c4509512-8b9c-4845-ae09-b16af220b06b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_67e0708c-1628-4e13-ad6e-9a924629ed68" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_97ece266-e1b6-46fc-a46f-e19d088dd075" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_67e0708c-1628-4e13-ad6e-9a924629ed68" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_97ece266-e1b6-46fc-a46f-e19d088dd075" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_37053238-ca73-425e-8048-0241d8f5db53" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_67e0708c-1628-4e13-ad6e-9a924629ed68" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_37053238-ca73-425e-8048-0241d8f5db53" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_c0e397f0-d9e7-46fb-bac2-ab31a4c91ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_f57feacd-42d2-4cd2-a37e-18ea63f380c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_c0e397f0-d9e7-46fb-bac2-ab31a4c91ff3" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_f57feacd-42d2-4cd2-a37e-18ea63f380c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_df80e28f-f272-462c-b53c-65470f6597eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxLiabilitiesLeasingArrangements"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_c0e397f0-d9e7-46fb-bac2-ab31a4c91ff3" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_df80e28f-f272-462c-b53c-65470f6597eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_38c727ca-7489-474c-9fbb-189a2d549a4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_c0e397f0-d9e7-46fb-bac2-ab31a4c91ff3" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_38c727ca-7489-474c-9fbb-189a2d549a4a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/DebtSummaryofDebtDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#DebtSummaryofDebtDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/DebtSummaryofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_pwp_TotalLongTermDebtNet_403d72c9-4f8d-421a-b77c-9208e90fc0bf" xlink:href="pwp-20211231.xsd#pwp_TotalLongTermDebtNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_0267809a-a210-496d-acad-ac47b142e728" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_TotalLongTermDebtNet_403d72c9-4f8d-421a-b77c-9208e90fc0bf" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_0267809a-a210-496d-acad-ac47b142e728" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_b7b8acc6-3b61-49ef-b9f2-3c4841c5fc62" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_TotalLongTermDebtNet_403d72c9-4f8d-421a-b77c-9208e90fc0bf" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_b7b8acc6-3b61-49ef-b9f2-3c4841c5fc62" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/NetIncomeLossPerShareAttributabletoClassACommonShareholdersScheduleofComputationofBasicandDilutedNetIncomeLossPerShareAttributabletoClassACommonShareholdersDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#NetIncomeLossPerShareAttributabletoClassACommonShareholdersScheduleofComputationofBasicandDilutedNetIncomeLossPerShareAttributabletoClassACommonShareholdersDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/NetIncomeLossPerShareAttributabletoClassACommonShareholdersScheduleofComputationofBasicandDilutedNetIncomeLossPerShareAttributabletoClassACommonShareholdersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_8fecb8af-3a1e-4b59-99ae-67feb9a7e00c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_0cf7d72f-1a94-4751-b702-04c0b44ed0dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_8fecb8af-3a1e-4b59-99ae-67feb9a7e00c" xlink:to="loc_us-gaap_NetIncomeLoss_0cf7d72f-1a94-4751-b702-04c0b44ed0dd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_AmountOfDilutiveSecuritiesPWPOpCoUnits_15e97a9b-9892-4c23-9166-7a21877acad5" xlink:href="pwp-20211231.xsd#pwp_AmountOfDilutiveSecuritiesPWPOpCoUnits"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_8fecb8af-3a1e-4b59-99ae-67feb9a7e00c" xlink:to="loc_pwp_AmountOfDilutiveSecuritiesPWPOpCoUnits_15e97a9b-9892-4c23-9166-7a21877acad5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_831a0790-d9cb-4c78-8bd1-e96092b178dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a2176cdc-d35f-4018-8e88-8cede5958357" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_831a0790-d9cb-4c78-8bd1-e96092b178dc" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a2176cdc-d35f-4018-8e88-8cede5958357" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_IncrementalCommonSharesAttributableToExchangeOfOtherUnits_5a26125e-69b7-4d4f-8a3e-1d2d3414bec9" xlink:href="pwp-20211231.xsd#pwp_IncrementalCommonSharesAttributableToExchangeOfOtherUnits"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_831a0790-d9cb-4c78-8bd1-e96092b178dc" xlink:to="loc_pwp_IncrementalCommonSharesAttributableToExchangeOfOtherUnits_5a26125e-69b7-4d4f-8a3e-1d2d3414bec9" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/FairValueMeasurementsandInvestmentsScheduleofAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#FairValueMeasurementsandInvestmentsScheduleofAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/FairValueMeasurementsandInvestmentsScheduleofAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_6a4bdc55-c54f-43fa-8c2f-04af2d5ecbf8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_88a3e81c-e8e9-466e-9344-5dd8c9798b00" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_6a4bdc55-c54f-43fa-8c2f-04af2d5ecbf8" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_88a3e81c-e8e9-466e-9344-5dd8c9798b00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueFairValueDisclosure_3c1a191a-869a-490d-98e1-6e6b26feb440" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashSurrenderValueFairValueDisclosure"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_6a4bdc55-c54f-43fa-8c2f-04af2d5ecbf8" xlink:to="loc_us-gaap_CashSurrenderValueFairValueDisclosure_3c1a191a-869a-490d-98e1-6e6b26feb440" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_62871311-d11c-455a-af0c-688402b0de17" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_de75ec70-442e-413c-8d54-5fc84651d618" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_62871311-d11c-455a-af0c-688402b0de17" xlink:to="loc_us-gaap_DerivativeLiabilities_de75ec70-442e-413c-8d54-5fc84651d618" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://pwp.com/role/RelatedPartyTransactionsScheduleofEstimatedPaymentsUnderTaxReceivableAgreementDetails" xlink:type="simple" xlink:href="pwp-20211231.xsd#RelatedPartyTransactionsScheduleofEstimatedPaymentsUnderTaxReceivableAgreementDetails"/>
  <link:calculationLink xlink:role="http://pwp.com/role/RelatedPartyTransactionsScheduleofEstimatedPaymentsUnderTaxReceivableAgreementDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_29685502-3880-4f34-ba94-d282860c7db4" xlink:href="pwp-20211231.xsd#pwp_AmountDuePursuantToTaxReceivableAgreement"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementAfterYearFive_8cae5cc7-43d8-4104-96c3-5e6ff6f23615" xlink:href="pwp-20211231.xsd#pwp_EstimatedPaymentsUnderTaxReceivableAgreementAfterYearFive"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_29685502-3880-4f34-ba94-d282860c7db4" xlink:to="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementAfterYearFive_8cae5cc7-43d8-4104-96c3-5e6ff6f23615" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearFive_fe354067-3cdf-425a-a625-674eb5915548" xlink:href="pwp-20211231.xsd#pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearFive"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_29685502-3880-4f34-ba94-d282860c7db4" xlink:to="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearFive_fe354067-3cdf-425a-a625-674eb5915548" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearFour_f00311c5-6b6e-495a-8484-092028a77740" xlink:href="pwp-20211231.xsd#pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearFour"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_29685502-3880-4f34-ba94-d282860c7db4" xlink:to="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearFour_f00311c5-6b6e-495a-8484-092028a77740" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearTwo_003e3eb9-3519-45bb-b0ce-1bb41b9cf538" xlink:href="pwp-20211231.xsd#pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearTwo"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_29685502-3880-4f34-ba94-d282860c7db4" xlink:to="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearTwo_003e3eb9-3519-45bb-b0ce-1bb41b9cf538" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearThree_99c16c5b-e6c4-4f6b-b021-b319110e69b0" xlink:href="pwp-20211231.xsd#pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearThree"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_29685502-3880-4f34-ba94-d282860c7db4" xlink:to="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearThree_99c16c5b-e6c4-4f6b-b021-b319110e69b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearOne_03868571-15af-45b7-824a-771a983b83ef" xlink:href="pwp-20211231.xsd#pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearOne"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pwp_AmountDuePursuantToTaxReceivableAgreement_29685502-3880-4f34-ba94-d282860c7db4" xlink:to="loc_pwp_EstimatedPaymentsUnderTaxReceivableAgreementYearOne_03868571-15af-45b7-824a-771a983b83ef" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
