

<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" 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">
  <link:roleRef roleURI="http://www.liquidityservices.com/role/BusinessRealignmentExpenses" xlink:href="lqdt-20180630.xsd#BusinessRealignmentExpenses" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/BusinessRealignmentExpensesNarrativeDetails" xlink:href="lqdt-20180630.xsd#BusinessRealignmentExpensesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/BusinessRealignmentExpensesRestructuringRelatedCostsDetails" xlink:href="lqdt-20180630.xsd#BusinessRealignmentExpensesRestructuringRelatedCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/BusinessRealignmentExpensesTables" xlink:href="lqdt-20180630.xsd#BusinessRealignmentExpensesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/ConsolidatedBalanceSheets" xlink:href="lqdt-20180630.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="lqdt-20180630.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/DefinedBenefitPensionPlan" xlink:href="lqdt-20180630.xsd#DefinedBenefitPensionPlan" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/DefinedBenefitPensionPlanNetPeriodicBenefitDetails" xlink:href="lqdt-20180630.xsd#DefinedBenefitPensionPlanNetPeriodicBenefitDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/DefinedBenefitPensionPlanTables" xlink:href="lqdt-20180630.xsd#DefinedBenefitPensionPlanTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/DocumentAndEntityInformation" xlink:href="lqdt-20180630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/FairValueMeasurement" xlink:href="lqdt-20180630.xsd#FairValueMeasurement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/FairValueMeasurementChangeInLevel3AssetsDetails" xlink:href="lqdt-20180630.xsd#FairValueMeasurementChangeInLevel3AssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/FairValueMeasurementNarrativeDetails" xlink:href="lqdt-20180630.xsd#FairValueMeasurementNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/FairValueMeasurementTables" xlink:href="lqdt-20180630.xsd#FairValueMeasurementTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/Goodwill" xlink:href="lqdt-20180630.xsd#Goodwill" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/GoodwillAdjustmentsDetails" xlink:href="lqdt-20180630.xsd#GoodwillAdjustmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/GoodwillTables" xlink:href="lqdt-20180630.xsd#GoodwillTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/Guarantees" xlink:href="lqdt-20180630.xsd#Guarantees" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/GuaranteesNarrativeDetails" xlink:href="lqdt-20180630.xsd#GuaranteesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/IncomeTaxes" xlink:href="lqdt-20180630.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/IncomeTaxesNarrativeDetails" xlink:href="lqdt-20180630.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/IntangibleAssets" xlink:href="lqdt-20180630.xsd#IntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/IntangibleAssetsAmortizationDetails" xlink:href="lqdt-20180630.xsd#IntangibleAssetsAmortizationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/IntangibleAssetsCarryingAmountDetails" xlink:href="lqdt-20180630.xsd#IntangibleAssetsCarryingAmountDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/IntangibleAssetsNarrativeDetails" xlink:href="lqdt-20180630.xsd#IntangibleAssetsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/IntangibleAssetsTables" xlink:href="lqdt-20180630.xsd#IntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/LegalProceedings" xlink:href="lqdt-20180630.xsd#LegalProceedings" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/LegalProceedingsNarrativeDetails" xlink:href="lqdt-20180630.xsd#LegalProceedingsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/Organization" xlink:href="lqdt-20180630.xsd#Organization" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/OrganizationNarrativeDetails" xlink:href="lqdt-20180630.xsd#OrganizationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SegmentInformation" xlink:href="lqdt-20180630.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SegmentInformationNarrativeDetails" xlink:href="lqdt-20180630.xsd#SegmentInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SegmentInformationReconciliationOfRevenueDetails" xlink:href="lqdt-20180630.xsd#SegmentInformationReconciliationOfRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SegmentInformationTables" xlink:href="lqdt-20180630.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SignificantContracts" xlink:href="lqdt-20180630.xsd#SignificantContracts" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SignificantContractsNarrativeDetails" xlink:href="lqdt-20180630.xsd#SignificantContractsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/StockholdersEquity" xlink:href="lqdt-20180630.xsd#StockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/StockholdersEquity2006PlanActivityDetails" xlink:href="lqdt-20180630.xsd#StockholdersEquity2006PlanActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/StockholdersEquityNarrativeDetails" xlink:href="lqdt-20180630.xsd#StockholdersEquityNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/StockholdersEquityRestrictedShareActivityDetails" xlink:href="lqdt-20180630.xsd#StockholdersEquityRestrictedShareActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/StockholdersEquityTables" xlink:href="lqdt-20180630.xsd#StockholdersEquityTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SubsequentEvent" xlink:href="lqdt-20180630.xsd#SubsequentEvent" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SubsequentEventNarrativeDetails" xlink:href="lqdt-20180630.xsd#SubsequentEventNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="lqdt-20180630.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails" xlink:href="lqdt-20180630.xsd#SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:href="lqdt-20180630.xsd#SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="lqdt-20180630.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="lqdt-20180630.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/UnauditedConsolidatedStatementsOfCashFlows" xlink:href="lqdt-20180630.xsd#UnauditedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/UnauditedConsolidatedStatementsOfComprehensiveLoss" xlink:href="lqdt-20180630.xsd#UnauditedConsolidatedStatementsOfComprehensiveLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.liquidityservices.com/role/UnauditedConsolidatedStatementsOfOperations" xlink:href="lqdt-20180630.xsd#UnauditedConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/BusinessRealignmentExpenses" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/BusinessRealignmentExpensesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/BusinessRealignmentExpensesRestructuringRelatedCostsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/BusinessRealignmentExpensesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07da1db4-2708-4446-4250-1fdd5956185e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07da1db4-2708-4446-4250-1fdd5956185e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_dd7775cd-f4ab-5607-9b31-1ee98f605818" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_dd7775cd-f4ab-5607-9b31-1ee98f605818" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PrepaidTaxes" xlink:label="loc_us-gaap_PrepaidTaxes_02645454-7101-7c15-39a1-317d5d74cc69" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_PrepaidTaxes_02645454-7101-7c15-39a1-317d5d74cc69" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_d585eba8-c5c0-6186-d29a-3180d2b06f0a" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_ShortTermInvestments_d585eba8-c5c0-6186-d29a-3180d2b06f0a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_93a64cae-271a-5e6b-8c83-5adf9f941142" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_Goodwill_93a64cae-271a-5e6b-8c83-5adf9f941142" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsGrossNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsGrossNoncurrent_005d7dfb-314a-2061-3659-035579b71a4d" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_DeferredTaxAssetsGrossNoncurrent_005d7dfb-314a-2061-3659-035579b71a4d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_7a72b51a-735c-1ad4-bd3f-d9bcf2d6a26d" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_AccountsPayableCurrent_7a72b51a-735c-1ad4-bd3f-d9bcf2d6a26d" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_AccruedExpensesAndOtherCurrentLiabilities" xlink:label="loc_lqdt_AccruedExpensesAndOtherCurrentLiabilities_df9916ec-8e46-47ca-3392-9e551ccb2b4e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_lqdt_AccruedExpensesAndOtherCurrentLiabilities_df9916ec-8e46-47ca-3392-9e551ccb2b4e" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_ProfitSharingDistributionsPayable" xlink:label="loc_lqdt_ProfitSharingDistributionsPayable_716e8e99-f973-95d7-fb81-9e551cccfe10" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_lqdt_ProfitSharingDistributionsPayable_716e8e99-f973-95d7-fb81-9e551cccfe10" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_PayablesToSellersCurrent" xlink:label="loc_lqdt_PayablesToSellersCurrent_8EE28C8E720A53B12CDE221A9D8388ED" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_lqdt_PayablesToSellersCurrent_8EE28C8E720A53B12CDE221A9D8388ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent_3bdd6481-d3f9-8073-51b0-5e638af7354d" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent_3bdd6481-d3f9-8073-51b0-5e638af7354d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_c3f7606a-e7e9-61d5-b60b-b4b059f68b26" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_CommonStockValue_c3f7606a-e7e9-61d5-b60b-b4b059f68b26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_41895068-9590-2880-73df-521995865843" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_41895068-9590-2880-73df-521995865843" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_04f0961a-a0bc-88cf-6658-3f950da4a458" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_04f0961a-a0bc-88cf-6658-3f950da4a458" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_065cb284-7fca-cc9b-5752-2feaf74d0011" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b158f76-5f04-5e4d-ead3-d80e1f9943db" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_065cb284-7fca-cc9b-5752-2feaf74d0011" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_058e01e4-b9a1-623e-29f5-1b5c79bf095a" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_CommitmentsAndContingencies_058e01e4-b9a1-623e-29f5-1b5c79bf095a" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/DefinedBenefitPensionPlan" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/DefinedBenefitPensionPlanNetPeriodicBenefitDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_89ad3af5-a7a9-a0b6-3ed0-1824210c7a90" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_89ad3af5-a7a9-a0b6-3ed0-1824210c7a90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_50406d00-3746-2e05-3a50-4b2bf529ff14" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_50406d00-3746-2e05-3a50-4b2bf529ff14" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_053c4475-6836-cf00-1abe-b15f58110eab" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_053c4475-6836-cf00-1abe-b15f58110eab" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_DefinedBenefitPlanSettlementCost" xlink:label="loc_lqdt_DefinedBenefitPlanSettlementCost_E4547A9CC9A6D37C679E1ECC2B3FB20C" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_bae25320-9d69-b27b-4684-0b60368d617f" xlink:to="loc_lqdt_DefinedBenefitPlanSettlementCost_E4547A9CC9A6D37C679E1ECC2B3FB20C" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/DefinedBenefitPensionPlanTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/FairValueMeasurement" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/FairValueMeasurementChangeInLevel3AssetsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/FairValueMeasurementNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/FairValueMeasurementTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/Goodwill" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/GoodwillAdjustmentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/GoodwillTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/Guarantees" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/GuaranteesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/IncomeTaxes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/IntangibleAssets" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/IntangibleAssetsAmortizationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_eddc9cd1-842c-4ab4-6a14-582ff2d019b0" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_eddc9cd1-842c-4ab4-6a14-582ff2d019b0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_e44a1606-1eda-278a-1c39-e2fcbf96f248" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_e44a1606-1eda-278a-1c39-e2fcbf96f248" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6a8745e2-e4b9-1a92-2a4b-72abaf326824" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6a8745e2-e4b9-1a92-2a4b-72abaf326824" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_ceebb9d8-94b3-173f-0af1-6bad40ca326c" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_ceebb9d8-94b3-173f-0af1-6bad40ca326c" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_FiniteLivedIntangibleAssetsAmortizationExpenseYearFiveAndThereafter" xlink:label="loc_lqdt_FiniteLivedIntangibleAssetsAmortizationExpenseYearFiveAndThereafter_d9b1a4a4-30d3-752b-cbce-9e551d157264" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:to="loc_lqdt_FiniteLivedIntangibleAssetsAmortizationExpenseYearFiveAndThereafter_d9b1a4a4-30d3-752b-cbce-9e551d157264" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/IntangibleAssetsCarryingAmountDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5d62e128-f1a1-954f-82e2-1936cb67d793" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5d62e128-f1a1-954f-82e2-1936cb67d793" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c3ed8a56-abe0-6418-c541-e6b647d6318a" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_1fe06082-076b-052d-6e2e-930afe9d6b2d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c3ed8a56-abe0-6418-c541-e6b647d6318a" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/IntangibleAssetsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/IntangibleAssetsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/LegalProceedings" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/LegalProceedingsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/Organization" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/OrganizationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SegmentInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SegmentInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SegmentInformationReconciliationOfRevenueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_aaae347c-fa91-e2c3-dd05-1b008b13fd0c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:to="loc_us-gaap_GrossProfit_aaae347c-fa91-e2c3-dd05-1b008b13fd0c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:to="loc_us-gaap_OperatingExpenses_23a4428c-a5e3-3b9c-fc88-04ae5be27ab3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_1df5100d-c7c3-27c8-1405-81abbd3827e1" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_1df5100d-c7c3-27c8-1405-81abbd3827e1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SignificantContracts" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SignificantContractsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/StockholdersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/StockholdersEquity2006PlanActivityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/StockholdersEquityRestrictedShareActivityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/StockholdersEquityTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SubsequentEvent" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SubsequentEventNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_86e61cf2-b7b2-e230-65f1-5a2b152f3a30" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_86e61cf2-b7b2-e230-65f1-5a2b152f3a30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_7b1369dd-f813-fe00-b292-96e275568f1b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_7b1369dd-f813-fe00-b292-96e275568f1b" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/UnauditedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_dd2e9db6-10f9-d78a-ba84-b18268245a83" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_dd2e9db6-10f9-d78a-ba84-b18268245a83" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent" xlink:label="loc_us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent_5b016183-9a4c-5629-5ddd-e2d0239e5483" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_IncreaseDecreaseInIntangibleAssetsCurrent_5b016183-9a4c-5629-5ddd-e2d0239e5483" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fee12b15-6b42-6245-2e2f-ff030b98332c" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fee12b15-6b42-6245-2e2f-ff030b98332c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_f7ed6106-862d-edb5-3fd1-677e7651af64" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_f7ed6106-862d-edb5-3fd1-677e7651af64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_e9694662-6637-d237-1a9d-f800fe1b0696" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_e9694662-6637-d237-1a9d-f800fe1b0696" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_dd2e9db6-10f9-d78a-ba84-b18268245a83" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_cfab4180-0727-b022-76c1-dcd34f4a6382" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_DepreciationAndAmortization_cfab4180-0727-b022-76c1-dcd34f4a6382" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryWriteDown" xlink:label="loc_us-gaap_InventoryWriteDown_465a701c-1a09-e612-58d3-e97e6f9af962" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_InventoryWriteDown_465a701c-1a09-e612-58d3-e97e6f9af962" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_3bb02469-191c-4baa-c8ee-e08be21b11bb" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_3bb02469-191c-4baa-c8ee-e08be21b11bb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_f75d01b7-d271-b07d-c4a7-6ae60293303d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_1aa7b6d6-aeca-d9ef-dbf5-8b872fd5ab04" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_1aa7b6d6-aeca-d9ef-dbf5-8b872fd5ab04" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_26d5f1bc-c2c5-92ae-e713-aacdbfe080be" xlink:type="locator" />
    <link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_26d5f1bc-c2c5-92ae-e713-aacdbfe080be" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_5b3d4a64-864e-a67c-1d85-8163ad700c58" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_5b3d4a64-864e-a67c-1d85-8163ad700c58" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_dd4bfa5e-1979-c817-e8a9-371104c0d4f7" xlink:type="locator" />
    <link:calculationArc order="10" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_dd4bfa5e-1979-c817-e8a9-371104c0d4f7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_bf3f9720-ba63-7ecd-52ae-e754a6f349db" xlink:type="locator" />
    <link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_bf3f9720-ba63-7ecd-52ae-e754a6f349db" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_IncreaseDecreaseInPrepaidExpensesAndDeferredTaxes" xlink:label="loc_lqdt_IncreaseDecreaseInPrepaidExpensesAndDeferredTaxes_d1f072cd-4166-6d0c-b337-9e551cd9020a" xlink:type="locator" />
    <link:calculationArc order="12" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_lqdt_IncreaseDecreaseInPrepaidExpensesAndDeferredTaxes_d1f072cd-4166-6d0c-b337-9e551cd9020a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_c998cbd2-a633-c2ec-1932-e3bfedecbc9f" xlink:type="locator" />
    <link:calculationArc order="13" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_c998cbd2-a633-c2ec-1932-e3bfedecbc9f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_a8b6fe35-4809-bddf-7ef6-3144a6c89165" xlink:type="locator" />
    <link:calculationArc order="14" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_a8b6fe35-4809-bddf-7ef6-3144a6c89165" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_06dd9f1c-1525-26ac-8777-af6cdc28e5fc" xlink:type="locator" />
    <link:calculationArc order="15" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_06dd9f1c-1525-26ac-8777-af6cdc28e5fc" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_IncreaseDecreaseInProfitSharingDistributionsPayable" xlink:label="loc_lqdt_IncreaseDecreaseInProfitSharingDistributionsPayable_73d9ca49-a33f-6cf3-184d-9e551cc740ef" xlink:type="locator" />
    <link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_lqdt_IncreaseDecreaseInProfitSharingDistributionsPayable_73d9ca49-a33f-6cf3-184d-9e551cc740ef" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_IncreaseDecreaseInPayablesToSellers" xlink:label="loc_lqdt_IncreaseDecreaseInPayablesToSellers_9293acc3-6fa0-04f3-65c0-9e551cd14347" xlink:type="locator" />
    <link:calculationArc order="17" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_lqdt_IncreaseDecreaseInPayablesToSellers_9293acc3-6fa0-04f3-65c0-9e551cd14347" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_7e3bb724-19f9-7fc7-d3fb-60f34a11e15a" xlink:type="locator" />
    <link:calculationArc order="18" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_7e3bb724-19f9-7fc7-d3fb-60f34a11e15a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_8629a772-7004-5d77-9980-0f501e29c5c8" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_dd2e9db6-10f9-d78a-ba84-b18268245a83" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_8629a772-7004-5d77-9980-0f501e29c5c8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_dd2e9db6-10f9-d78a-ba84-b18268245a83" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_d04df344-47da-0222-79d0-99b7d739fd60" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_d04df344-47da-0222-79d0-99b7d739fd60" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/UnauditedConsolidatedStatementsOfComprehensiveLoss" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_4230dd8a-1a56-db80-c035-2fabf7b960fd" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_72d12753-e25c-cdc0-88b6-98db8d7b7fae" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_4230dd8a-1a56-db80-c035-2fabf7b960fd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.liquidityservices.com/role/UnauditedConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:to="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_ff017a48-8743-bfac-8af0-ca31401cb6de" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:to="loc_us-gaap_SalesRevenueNet_ff017a48-8743-bfac-8af0-ca31401cb6de" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueGoodsNet" xlink:label="loc_us-gaap_SalesRevenueGoodsNet_318cebec-2b05-42bf-a988-02b2e99cecfb" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesRevenueNet_ff017a48-8743-bfac-8af0-ca31401cb6de" xlink:to="loc_us-gaap_SalesRevenueGoodsNet_318cebec-2b05-42bf-a988-02b2e99cecfb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_ad6c862c-c374-70de-502e-5f168b553492" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesRevenueNet_ff017a48-8743-bfac-8af0-ca31401cb6de" xlink:to="loc_us-gaap_SalesRevenueServicesNet_ad6c862c-c374-70de-502e-5f168b553492" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:to="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfGoodsSold" xlink:label="loc_us-gaap_CostOfGoodsSold_23c68b7c-81fb-cba2-1814-b7ab4991d5d0" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_CostOfGoodsSold_23c68b7c-81fb-cba2-1814-b7ab4991d5d0" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_ProfitSharingDistributions" xlink:label="loc_lqdt_ProfitSharingDistributions_66a4dc9f-ca72-3cc6-6ac7-9e551d626cc6" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_lqdt_ProfitSharingDistributions_66a4dc9f-ca72-3cc6-6ac7-9e551d626cc6" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_TechnologyAndOperationsExpense" xlink:label="loc_lqdt_TechnologyAndOperationsExpense_bf281d89-8c99-47f2-37ab-9e551d746010" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_lqdt_TechnologyAndOperationsExpense_bf281d89-8c99-47f2-37ab-9e551d746010" xlink:type="arc" />
    <link:loc xlink:href="lqdt-20180630.xsd#lqdt_SalesAndMarketing" xlink:label="loc_lqdt_SalesAndMarketing_c1d39388-3ce0-d80b-0908-9e551ce4838f" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_lqdt_SalesAndMarketing_c1d39388-3ce0-d80b-0908-9e551ce4838f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_87411e46-c979-a1ff-e8b3-f4f75d86b855" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_87411e46-c979-a1ff-e8b3-f4f75d86b855" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_cfab4180-0727-b022-76c1-dcd34f4a6382" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_DepreciationAndAmortization_cfab4180-0727-b022-76c1-dcd34f4a6382" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseNet" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_ab06ec5a-9261-11bd-0689-b1274ed341b3" xlink:type="locator" />
    <link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_ab06ec5a-9261-11bd-0689-b1274ed341b3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_1df5100d-c7c3-27c8-1405-81abbd3827e1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0eb47183-f513-314d-ceda-ee2412d9eee8" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_1df5100d-c7c3-27c8-1405-81abbd3827e1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_3d9b4bd2-957e-ddb5-7841-6a572de70646" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="arc" />
  </link:calculationLink>
</link:linkbase>





