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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fa8e4-19ee-7d47-b3b3-a935c98c4a1d,g:f61c6a18-118b-4462-bbe8-a92dcedde772-->
<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:arcroleRef arcroleURI="https://xbrl.org/2023/arcrole/summation-item" xlink:type="simple" xlink:href="https://www.xbrl.org/2023/calculation-1.1.xsd#summation-item"/>
  <link:roleRef roleURI="http://www.hl.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="hli-20260630.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fa8e4-1aae-7b50-bfbc-13ba40af6e85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fa8e4-1aae-7b50-bfbc-13ba40af6e85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecurities_019fa8e4-1aae-741a-9b8a-3d3a486a345c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_us-gaap_MarketableSecurities_019fa8e4-1aae-741a-9b8a-3d3a486a345c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_019fa8e4-1aae-7cf5-96b8-b6d88b96b4e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_us-gaap_AccountsReceivableNet_019fa8e4-1aae-7cf5-96b8-b6d88b96b4e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hli_UnbilledReceivablesWorkInProcess_019fa8e4-1aae-7c25-a492-93c9ec1936ab" xlink:href="hli-20260630.xsd#hli_UnbilledReceivablesWorkInProcess"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_hli_UnbilledReceivablesWorkInProcess_019fa8e4-1aae-7c25-a492-93c9ec1936ab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa8e4-1aae-7e84-96f5-04c208826d48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa8e4-1aae-7e84-96f5-04c208826d48" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019fa8e4-1aae-714c-a399-1d40211a8345" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019fa8e4-1aae-714c-a399-1d40211a8345" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019fa8e4-1aae-7b44-a646-1c4ed1460ea3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_us-gaap_Goodwill_019fa8e4-1aae-7b44-a646-1c4ed1460ea3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsNet_019fa8e4-1aae-7d2f-abe3-2db5bdb3918c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherIntangibleAssetsNet"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_us-gaap_OtherIntangibleAssetsNet_019fa8e4-1aae-7d2f-abe3-2db5bdb3918c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019fa8e4-1aae-70ba-8109-999aac6c9c5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_019fa8e4-1aae-7ad3-a5e2-565cf482c698" xlink:to="loc_us-gaap_OtherAssets_019fa8e4-1aae-70ba-8109-999aac6c9c5e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fa8f7-b060-7ef6-b292-c8194911e469" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019fa8f7-b060-78bf-802a-653181819a4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fa8f7-b060-7ef6-b292-c8194911e469" xlink:to="loc_us-gaap_CommonStockValue_019fa8f7-b060-78bf-802a-653181819a4d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019fa8f7-b060-7fd8-88d8-aab73ab35cbe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fa8f7-b060-7ef6-b292-c8194911e469" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019fa8f7-b060-7fd8-88d8-aab73ab35cbe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fa8f7-b060-7168-88d0-45d824f5ad06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fa8f7-b060-7ef6-b292-c8194911e469" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019fa8f7-b060-7168-88d0-45d824f5ad06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019fa8f7-b060-7186-8acc-c6b7eff6d08c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_019fa8f7-b060-7ef6-b292-c8194911e469" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019fa8f7-b060-7186-8acc-c6b7eff6d08c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa8e4-1aae-738f-821d-b7fb570fa4e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fa8e4-1aae-716d-adfb-eacac3254567" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa8e4-1aae-738f-821d-b7fb570fa4e3" xlink:to="loc_us-gaap_Liabilities_019fa8e4-1aae-716d-adfb-eacac3254567" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019fa8e4-1aae-7a0d-9176-0474d1ca0409" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa8e4-1aae-738f-821d-b7fb570fa4e3" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019fa8e4-1aae-7a0d-9176-0474d1ca0409" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019fa8f8-3e19-7440-b06b-707e33285b2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa8e4-1aae-738f-821d-b7fb570fa4e3" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_019fa8f8-3e19-7440-b06b-707e33285b2c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019fa8f8-3e19-71da-9194-1b4c1199640e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_019fa8e4-1aae-738f-821d-b7fb570fa4e3" xlink:to="loc_us-gaap_StockholdersEquity_019fa8f8-3e19-71da-9194-1b4c1199640e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019fa8e4-1aae-7bde-a2d3-81e38b6f6b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019fa8e4-1aae-7f6e-a4c7-cd413caca7c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa8e4-1aae-7bde-a2d3-81e38b6f6b8c" xlink:to="loc_us-gaap_OperatingLeaseLiability_019fa8e4-1aae-7f6e-a4c7-cd413caca7c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019fa8e4-1aae-75e7-87cf-2530f36326da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa8e4-1aae-7bde-a2d3-81e38b6f6b8c" xlink:to="loc_us-gaap_OtherLiabilities_019fa8e4-1aae-75e7-87cf-2530f36326da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_019fa8e4-1aae-7d1f-aaa0-35d66e67c953" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa8e4-1aae-7bde-a2d3-81e38b6f6b8c" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent_019fa8e4-1aae-7d1f-aaa0-35d66e67c953" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019fa8e4-1aae-7150-a364-992737e147c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_019fa8e4-1aae-7bde-a2d3-81e38b6f6b8c" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019fa8e4-1aae-7150-a364-992737e147c5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="simple" xlink:href="hli-20260630.xsd#CONSOLIDATEDSTATEMENTSOFINCOME"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_019fa8e4-1aae-7f24-8df2-37cd72df3124" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_019fa8e4-1aae-7f24-8df2-37cd72df3124" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_019fa8e4-1aae-72d6-b2a3-061633248b8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_us-gaap_OperatingLeaseExpense_019fa8e4-1aae-72d6-b2a3-061633248b8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_019fa8e4-1aae-73c8-933c-14137390b875" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommunicationsAndInformationTechnology"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_019fa8e4-1aae-73c8-933c-14137390b875" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_019fa8e4-1aae-7d77-b6af-326bd365b181" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfessionalFees"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_us-gaap_ProfessionalFees_019fa8e4-1aae-7d77-b6af-326bd365b181" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019fa8e4-1aae-7ba3-9a06-ab6ca2ba7567" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019fa8e4-1aae-7ba3-9a06-ab6ca2ba7567" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TravelAndEntertainmentExpense_019fa8e4-1aae-7920-9bf0-8051d6b702a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TravelAndEntertainmentExpense"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_us-gaap_TravelAndEntertainmentExpense_019fa8e4-1aae-7920-9bf0-8051d6b702a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019fa8e4-1aae-76d1-9f68-846b5d8f3039" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019fa8e4-1aae-76d1-9f68-846b5d8f3039" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_019fa8e4-1aae-7202-bec7-f0541bf357ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_us-gaap_DepreciationAndAmortization_019fa8e4-1aae-7202-bec7-f0541bf357ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hli_BusinessCombination.RevaluationOfContingentConsideration_019fa8e4-1aae-7fc0-811e-b3083d777602" xlink:href="hli-20260630.xsd#hli_BusinessCombination.RevaluationOfContingentConsideration"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-7ac0-89f3-c1e27c90fd8b" xlink:to="loc_hli_BusinessCombination.RevaluationOfContingentConsideration_019fa8e4-1aae-7fc0-811e-b3083d777602" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019fa8e4-1aae-7fb0-af7b-fe5ec89c2c0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-73ca-8290-8431a52153e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_019fa8e4-1aae-7fb0-af7b-fe5ec89c2c0c" xlink:to="loc_us-gaap_OperatingExpenses_019fa8e4-1aae-73ca-8290-8431a52153e3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fa8e4-1aae-78c2-b0c7-444d6f1266e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_019fa8e4-1aae-7fb0-af7b-fe5ec89c2c0c" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fa8e4-1aae-78c2-b0c7-444d6f1266e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019fa8e4-1aae-7713-9840-f2470e05cc89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019fa8e4-1aae-79e8-82aa-019f1cd536c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_019fa8e4-1aae-7713-9840-f2470e05cc89" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019fa8e4-1aae-79e8-82aa-019f1cd536c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fa8e4-1aae-7aae-be79-d63b5da2125c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_019fa8e4-1aae-7713-9840-f2470e05cc89" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fa8e4-1aae-7aae-be79-d63b5da2125c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fa8e4-1aae-79fb-8e7f-029f120f8592" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019fa8e4-1aae-7f8c-98ef-918f11c4545f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fa8e4-1aae-79fb-8e7f-029f120f8592" xlink:to="loc_us-gaap_OperatingIncomeLoss_019fa8e4-1aae-7f8c-98ef-918f11c4545f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019fa8e4-1aae-7b5e-8b64-dc4690908831" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fa8e4-1aae-79fb-8e7f-029f120f8592" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019fa8e4-1aae-7b5e-8b64-dc4690908831" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fa8f9-b694-7898-a551-8966728f2a18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019fa8f9-b694-70c0-99df-1c7d0f8b24c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019fa8f9-b694-7898-a551-8966728f2a18" xlink:to="loc_us-gaap_ProfitLoss_019fa8f9-b694-70c0-99df-1c7d0f8b24c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019fa8f9-b694-7587-b7d2-a36d5518f954" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_019fa8f9-b694-7898-a551-8966728f2a18" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019fa8f9-b694-7587-b7d2-a36d5518f954" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="hli-20260630.xsd#CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_019fa8fc-121f-718b-a5b3-b347db9019ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fa8fc-121f-7f8d-89da-be56112b2eaf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_019fa8fc-121f-718b-a5b3-b347db9019ac" xlink:to="loc_us-gaap_NetIncomeLoss_019fa8fc-121f-7f8d-89da-be56112b2eaf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_019fa8fc-121f-7916-943a-9ec138697cc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_019fa8fc-121f-718b-a5b3-b347db9019ac" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_019fa8fc-121f-7916-943a-9ec138697cc5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fa8fc-cc91-7df3-8cb4-083966cdf0a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_019fa8fc-cc92-7cdc-a983-60f2a9426e5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fa8fc-cc91-7df3-8cb4-083966cdf0a9" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_019fa8fc-cc92-7cdc-a983-60f2a9426e5d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_019fa8fc-cc92-7810-9b17-d2c6ff0a041c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_019fa8fc-cc91-7df3-8cb4-083966cdf0a9" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_019fa8fc-cc92-7810-9b17-d2c6ff0a041c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="hli-20260630.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019fa8e4-1aae-75cf-83be-eb08b5001803" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_ProfitLoss_019fa8e4-1aae-75cf-83be-eb08b5001803" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019fa8e4-1aae-7789-b2e0-9189270231df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019fa8e4-1aae-7789-b2e0-9189270231df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019fa8e4-1aae-77a5-8c0b-8c7f62f8c230" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019fa8e4-1aae-77a5-8c0b-8c7f62f8c230" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_019fa8e4-1aae-76c0-a5ee-fd76680f6f6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_019fa8e4-1aae-76c0-a5ee-fd76680f6f6a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019fa8e4-1aae-7e4e-b0a9-0ac99eab4655" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019fa8e4-1aae-7e4e-b0a9-0ac99eab4655" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_019fa8e4-1aae-7fd1-8724-bec3584373a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_019fa8e4-1aae-7fd1-8724-bec3584373a6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019fa8e4-1aae-7b97-a201-159e4f8413f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019fa8e4-1aae-7b97-a201-159e4f8413f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hli_IncreaseDecreaseinUnbilledWorkinProcessNetofAcquisition_019fa8e4-1aae-7740-a1c8-8d9c8463c388" xlink:href="hli-20260630.xsd#hli_IncreaseDecreaseinUnbilledWorkinProcessNetofAcquisition"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_hli_IncreaseDecreaseinUnbilledWorkinProcessNetofAcquisition_019fa8e4-1aae-7740-a1c8-8d9c8463c388" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019fa8e4-1aae-702b-a727-d142b0984023" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019fa8e4-1aae-702b-a727-d142b0984023" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_019fa8e4-1aae-78e5-9344-02fe4d1f84df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_019fa8e4-1aae-78e5-9344-02fe4d1f84df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_019fa8e4-1aae-713b-b9ad-dd6e5874ae7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-72aa-b48a-05f99f53306f" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_019fa8e4-1aae-713b-b9ad-dd6e5874ae7d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa8e4-1aae-7711-bd00-3fc6eb0bd491" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividends_019fa8e4-1aae-72b6-9d7f-591f643e126d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividends"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa8e4-1aae-7711-bd00-3fc6eb0bd491" xlink:to="loc_us-gaap_PaymentsOfDividends_019fa8e4-1aae-72b6-9d7f-591f643e126d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquity_019fa8e4-1aae-7e9f-b914-3f07b8d51595" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfEquity"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa8e4-1aae-7711-bd00-3fc6eb0bd491" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquity_019fa8e4-1aae-7e9f-b914-3f07b8d51595" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019fa8e4-1aae-7dc8-bc38-0a72fad95173" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa8e4-1aae-7711-bd00-3fc6eb0bd491" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019fa8e4-1aae-7dc8-bc38-0a72fad95173" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019fa8e4-1aae-7f59-8515-e1fed05141b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa8e4-1aae-7711-bd00-3fc6eb0bd491" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019fa8e4-1aae-7f59-8515-e1fed05141b8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa8e4-1aae-7a5d-b790-bf0fa4873fec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019fa8e4-1aae-75dd-951a-58e02844871e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa8e4-1aae-7a5d-b790-bf0fa4873fec" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019fa8e4-1aae-75dd-951a-58e02844871e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_019fa8e4-1aae-73cd-bfc9-5c58caf90c10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireInvestments"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa8e4-1aae-7a5d-b790-bf0fa4873fec" xlink:to="loc_us-gaap_PaymentsToAcquireInvestments_019fa8e4-1aae-73cd-bfc9-5c58caf90c10" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019fa8e4-1aae-7679-a486-5d2f5bbd6d30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa8e4-1aae-7a5d-b790-bf0fa4873fec" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019fa8e4-1aae-7679-a486-5d2f5bbd6d30" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments_019fa8e4-1aae-761e-bbdb-4434f7638702" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa8e4-1aae-7a5d-b790-bf0fa4873fec" xlink:to="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments_019fa8e4-1aae-761e-bbdb-4434f7638702" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa8e4-1aae-727a-be65-3bccdf8a5bc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-7c6b-ab84-27485e4edd75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa8e4-1aae-727a-be65-3bccdf8a5bc7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019fa8e4-1aae-7c6b-ab84-27485e4edd75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa8e4-1aae-7e3b-9329-f9c8ebfd6fef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa8e4-1aae-727a-be65-3bccdf8a5bc7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019fa8e4-1aae-7e3b-9329-f9c8ebfd6fef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa8e4-1aae-72ca-9d0f-d5fc99cb450b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa8e4-1aae-727a-be65-3bccdf8a5bc7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019fa8e4-1aae-72ca-9d0f-d5fc99cb450b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fa8e4-1aae-711d-984c-fb498bd7f42f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019fa8e4-1aae-727a-be65-3bccdf8a5bc7" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fa8e4-1aae-711d-984c-fb498bd7f42f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/BASISOFPRESENTATIONANDCONSOLIDATIONReconciliationofCashCashEquivalentsandRestrictedCashDetails" xlink:type="simple" xlink:href="hli-20260630.xsd#BASISOFPRESENTATIONANDCONSOLIDATIONReconciliationofCashCashEquivalentsandRestrictedCashDetails"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/BASISOFPRESENTATIONANDCONSOLIDATIONReconciliationofCashCashEquivalentsandRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fa8e4-1aae-7c68-a01f-6788c1f15b54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fa8e4-1aae-7fe8-a5fd-3810ee4c4dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fa8e4-1aae-7c68-a01f-6788c1f15b54" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019fa8e4-1aae-7fe8-a5fd-3810ee4c4dd6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019fa8e4-1aae-7bc7-b3ef-ef36aaa9c4f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019fa8e4-1aae-7c68-a01f-6788c1f15b54" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019fa8e4-1aae-7bc7-b3ef-ef36aaa9c4f8" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/INVESTMENTSECURITIESScheduleofAmortizedCostGrossUnrealizedGainsandLossesandFairValueofSecuritiesHeldtoMaturityDetails" xlink:type="simple" xlink:href="hli-20260630.xsd#INVESTMENTSECURITIESScheduleofAmortizedCostGrossUnrealizedGainsandLossesandFairValueofSecuritiesHeldtoMaturityDetails"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/INVESTMENTSECURITIESScheduleofAmortizedCostGrossUnrealizedGainsandLossesandFairValueofSecuritiesHeldtoMaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fa8e4-1b60-721d-aeaf-f8948fa39d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebtAmortizedCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_hli_DebtSecuritiesTradingAccumulatedUnrecognizedGain_019fa8e4-1b60-73b1-8bc9-6e0f4fccb4a2" xlink:href="hli-20260630.xsd#hli_DebtSecuritiesTradingAccumulatedUnrecognizedGain"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fa8e4-1b60-721d-aeaf-f8948fa39d8e" xlink:to="loc_hli_DebtSecuritiesTradingAccumulatedUnrecognizedGain_019fa8e4-1b60-73b1-8bc9-6e0f4fccb4a2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_hli_DebtSecuritiesTradingAccumulatedUnrecognizedLoss_019fa8e4-1b60-76e0-8c51-933854e7cefe" xlink:href="hli-20260630.xsd#hli_DebtSecuritiesTradingAccumulatedUnrecognizedLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fa8e4-1b60-721d-aeaf-f8948fa39d8e" xlink:to="loc_hli_DebtSecuritiesTradingAccumulatedUnrecognizedLoss_019fa8e4-1b60-76e0-8c51-933854e7cefe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019fa8e4-1b60-7fd3-a8fa-688edc8bb75a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_TradingSecuritiesDebtAmortizedCost_019fa8e4-1b60-721d-aeaf-f8948fa39d8e" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019fa8e4-1b60-7fd3-a8fa-688edc8bb75a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/INVESTMENTSECURITIESScheduleofMaturitiesofDebtSecuritiesDetails" xlink:type="simple" xlink:href="hli-20260630.xsd#INVESTMENTSECURITIESScheduleofMaturitiesofDebtSecuritiesDetails"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/INVESTMENTSECURITIESScheduleofMaturitiesofDebtSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fa8e4-1b60-747c-a789-2ccced900a66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_019fa8e4-1b60-72f5-8f84-6db8c35a473a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fa8e4-1b60-747c-a789-2ccced900a66" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_019fa8e4-1b60-72f5-8f84-6db8c35a473a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019fa8e4-1b60-7d25-baeb-525ee89379c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue_019fa8e4-1b60-747c-a789-2ccced900a66" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019fa8e4-1b60-7d25-baeb-525ee89379c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fa8e4-1b60-78cb-ab8e-5f53ed1c0737" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_019fa8e4-1b60-7e53-819a-a3d4d8d21ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fa8e4-1b60-78cb-ab8e-5f53ed1c0737" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_019fa8e4-1b60-7e53-819a-a3d4d8d21ec7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_019fa8e4-1b60-77a3-b0f0-6d74a01307f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019fa8e4-1b60-78cb-ab8e-5f53ed1c0737" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_019fa8e4-1b60-77a3-b0f0-6d74a01307f2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/PROPERTYANDEQUIPMENTDetails" xlink:type="simple" xlink:href="hli-20260630.xsd#PROPERTYANDEQUIPMENTDetails"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/PROPERTYANDEQUIPMENTDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa8e4-1b60-7c63-85a3-a16b71ab7821" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019fa8e4-1b60-756a-9cd0-4da64db799a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa8e4-1b60-7c63-85a3-a16b71ab7821" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019fa8e4-1b60-756a-9cd0-4da64db799a6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019fa8e4-1b60-7040-8537-1d74c99b7418" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_019fa8e4-1b60-7c63-85a3-a16b71ab7821" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019fa8e4-1b60-7040-8537-1d74c99b7418" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofGoodwillandOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="hli-20260630.xsd#GOODWILLANDOTHERINTANGIBLEASSETSScheduleofGoodwillandOtherIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofGoodwillandOtherIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hli_IntangibleAssetsGrossIncludingGoodwill_019fa8e4-1b60-78ec-939d-d2e5bed41df6" xlink:href="hli-20260630.xsd#hli_IntangibleAssetsGrossIncludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019fa8e4-1b60-77a0-ac33-7fd2a1363fdd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hli_IntangibleAssetsGrossIncludingGoodwill_019fa8e4-1b60-78ec-939d-d2e5bed41df6" xlink:to="loc_us-gaap_Goodwill_019fa8e4-1b60-77a0-ac33-7fd2a1363fdd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedTradeNames_019fa8e4-1b60-71b0-a293-973c0ed3fffc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedTradeNames"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hli_IntangibleAssetsGrossIncludingGoodwill_019fa8e4-1b60-78ec-939d-d2e5bed41df6" xlink:to="loc_us-gaap_IndefiniteLivedTradeNames_019fa8e4-1b60-71b0-a293-973c0ed3fffc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherFiniteLivedIntangibleAssetsGross_019fa8e4-1b60-7b94-93de-3b55f3c43619" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherFiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_hli_IntangibleAssetsGrossIncludingGoodwill_019fa8e4-1b60-78ec-939d-d2e5bed41df6" xlink:to="loc_us-gaap_OtherFiniteLivedIntangibleAssetsGross_019fa8e4-1b60-7b94-93de-3b55f3c43619" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_019fa8e4-1b60-7e46-9e5b-b35b806a52b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_hli_IntangibleAssetsGrossIncludingGoodwill_019fa8e4-1b60-7c13-a767-8de5529868f8" xlink:href="hli-20260630.xsd#hli_IntangibleAssetsGrossIncludingGoodwill"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_019fa8e4-1b60-7e46-9e5b-b35b806a52b9" xlink:to="loc_hli_IntangibleAssetsGrossIncludingGoodwill_019fa8e4-1b60-7c13-a767-8de5529868f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019fa8e4-1b60-772c-9a8d-16eb438faa95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_019fa8e4-1b60-7e46-9e5b-b35b806a52b9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019fa8e4-1b60-772c-9a8d-16eb438faa95" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.hl.com/role/EARNINGSPERCOMMONSHAREDetails" xlink:type="simple" xlink:href="hli-20260630.xsd#EARNINGSPERCOMMONSHAREDetails"/>
  <link:calculationLink xlink:role="http://www.hl.com/role/EARNINGSPERCOMMONSHAREDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fa8e4-1b60-748f-bce7-15db1dc40085" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019fa90c-ec01-79aa-90e6-ff229a50133c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fa8e4-1b60-748f-bce7-15db1dc40085" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019fa90c-ec01-79aa-90e6-ff229a50133c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fa8e4-1b60-7e01-8a95-3089d579412d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019fa8e4-1b60-748f-bce7-15db1dc40085" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019fa8e4-1b60-7e01-8a95-3089d579412d" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
