-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 DkQ8yaDbSTcoYAnrHnZM316KQa6erPEuu6oaBzu5S15HaoMySmrhWnlSB4JbozkU
 Quj9FETCGsHIhzgGPQILQw==

<SEC-DOCUMENT>0001209191-10-057074.txt : 20101129
<SEC-HEADER>0001209191-10-057074.hdr.sgml : 20101129
<ACCEPTANCE-DATETIME>20101129144757
ACCESSION NUMBER:		0001209191-10-057074
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20101123
FILED AS OF DATE:		20101129
DATE AS OF CHANGE:		20101129

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Bluestein Scott
		CENTRAL INDEX KEY:			0001505910

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	814-00702
		FILM NUMBER:		101218544

	MAIL ADDRESS:	
		STREET 1:		303 COLUMBUS AVENUE
		STREET 2:		APT 506
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HERCULES TECHNOLOGY GROWTH CAPITAL INC
		CENTRAL INDEX KEY:			0001280784
		IRS NUMBER:				743113410
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		400 HAMILTON AVE
		STREET 2:		SUITE 310
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94301
		BUSINESS PHONE:		650-289-3060

	MAIL ADDRESS:	
		STREET 1:		400 HAMILTON AVE
		STREET 2:		SUITE 310
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94301
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-11-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001280784</issuerCik>
        <issuerName>HERCULES TECHNOLOGY GROWTH CAPITAL INC</issuerName>
        <issuerTradingSymbol>HTGC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001505910</rptOwnerCik>
            <rptOwnerName>Bluestein Scott</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O HERCULES TECHNOLOGY GROWTH CAPITAL</rptOwnerStreet1>
            <rptOwnerStreet2>31 ST. JAMES AVENUE, SUITE 790</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Credit Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Option to Purchase Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.90</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2010-11-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>125000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2017-11-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>125000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>125000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">One-third of the options vest on 11/23/2011 and two-thirds of the options vest prorata over the following twenty four months ending 11/23/2013.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Scott Harvey, Attorney-in-Fact for Scott Bluestein</signatureName>
        <signatureDate>2010-11-29</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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