485BPOS

AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON
November 29, 2012
SECURITIES ACT FILE NO. 2-14543 INVESTMENT COMPANY ACT FILE NO. 811-825

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [x]
PRE-EFFECTIVE AMENDMENT NO. __ [_]
POST-EFFECTIVE AMENDMENT NO. 77 [x]

AND/OR
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
AMENDMENT NO. 46 [x]

(CHECK APPROPRIATE BOX OR BOXES)
AMERICAN GROWTH FUND, INC.
(EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
1917 Market Street, Denver, Colorado 80202
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (ZIP CODE)
REGISTRANTS TELEPHONE NUMBER, INCLUDING AREA CODE (303) 626-0600

Robert Brody, 1917 Market Street, Denver, CO 80202
(Name and Address of Agent for Service)
Approximate Date of Proposed Public Offering: as soon as practicable after
the effective date of the Registration Statement
It is proposed that this filing will become effective (check appropriate box)

[X] immediately upon filing pursuant to paragraph (b)
[_] on pursuant to paragraph (b)
[_] 60 days after filing pursuant to paragraph (a)(1)
[_] on ___________ Pursuant to paragraph (a)(1)
[_] 75 days after filing pursuant to paragraph (a)(2)
[_] on (date) pursuant to paragraph (a)(2) of Rule 485

If appropriate, check the following box:
[_] this post-effective amendment designates a new effective Date for a previously filed post-effective amendment.


SIGNATURES
Pursuant to the requirements of (the Securities Act and) the Investment Company Act, the Fund has duly caused this registration statement to be signed on its behalf by the undersigned, duly authorized, in the City of Denver, and State of Colorado on the day of November 29, 2012.


American Growth Fund, Inc.
Fund

By /s/ Robert Brody
Robert Brody, President



Pursuant to the requirements of the Securities Act, this registration statement has been signed below by the following persons in the capacities and on the date(s) indicated.


/s/ Robert Brody
Robert Brody
President and Director
11/29/2012

/s/ Timothy E. Taggart
Timothy E. Taggart
Treasurer
11/29/2012

/s/ Eddie R. Bush
Eddie R. Bush
Director
11/29/2012

/s/ Harold Rosen
Harold Rosen
Director
11/29/2012

/s/ John Pasco III
John Pasco III
Director
11/29/2012

/s/ Dr. Brian Brody
Dr. Brian Brody
Director
11/29/2012



Exhibit Index


Index No. and Description of Exhibit

EX-101.INS XBRL Instance Document

EX-101.SCH XBRL Taxonomy Extension Schema Document

EX-101.CAL XBRL Taxonomy Extension Calculation Linkbase

EX-101.DEF XBRL Taxonomy Extension Definition Linkbase

EX-101.LAB XBRL Taxonomy Extension Labels Linkbase

EX-101.PRE XBRL Taxonomy Extension Presentation Linkbase

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	AMERICAN GROWTH FUND INC
Prospectus Date	rr_ProspectusDate	Nov. 29, 2012
Document Creation Date	dei_DocumentCreationDate	Nov. 29, 2012

XML

American Growth Fund Series Two

Risk Return Summary

Investment Objectives/Goals

The Fund´s primary objective is growth of capital.

Fee Table

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the American Growth Fund. More information about these and other discounts is available from your financial professional and in How to Reduce your Sales Charge, page 8 of the Fund´s prospectus and under Distribution of Fund Shares, Page 14 of the Fund´s statement of additional information.

SHAREHOLDER FEES: (fees paid directly from your investment)

Shareholder Fees American Growth Fund Series Two	Class E		Class F
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.75%		none
Maximum deferred sales charge (load) as a percentage of original purchase price or redemption proceeds, whichever is lower	1.00%	[1]	1.00%	[2]
Maximum sales charge (load) imposed on reinvested dividends	none		none
Redemption Fees	none		none
Exchange Fee	none		none
Maximum Account Fee	none		none

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment):

Annual Fund Operating Expenses American Growth Fund Series Two		Class E	Class F
Management Fees		1.00%	1.00%
Distribution and Service (12b-1) fees		0.30%	1.00%
Other Expenses	[1]	5.08%	5.14%
Total Annual Fund Operating Expenses		6.38%	7.14%

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund´s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example American Growth Fund Series Two (USD $)	1 Year	3 Years
Class E	1,172	2,342
Class F	806	2,074

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption American Growth Fund Series Two (USD $)	1 Year	3 Years
Class E	1,172	2,342
Class F	706	2,074

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund´s performance.

Principal Investment Strategy

Investment Research Corporation (the "Adviser") manages the Fund using a growth style of investing. We use a consistent approach to build the Fund´s security portfolio which is made up primarily of common stocks and securities convertible into common stock. These securities are issued by large companies, and to a lesser extent, small and mid-sized companies. When a company´s fundamentals are strong, we believe earnings growth will follow.

Principal risks of investing in the Fund

The primary risks of investing in the Fund are:

• Stock Market Risk - the value of an investment may fluctuate,

• Industry and Security Risk - risks relating to an industry as a whole or a company´s prospects for business success,

• Management Risk - risks that the Adviser´s assessment of a company´s growth prospects may not be accurate,

• Liquidity Risk - a given security or asset may not be readily marketable,

• Small Cap Risk - small cap stocks tend to have a high exposure to market fluctuations and failure,

• Mid Cap Risk - mid cap stocks tend to have a greater exposure to market fluctuations and failure.

• Convertible Security Risk - risk of loss of principal at maturity.

Loss of some or all of the money you invest is a risk of investing in the Fund.

[1] Purchases of Class E shares in amounts of $1,000,000 or more which are not subject to an initial sales charge generally will be subject to a contingent deferred sales charge of 1.0% of amounts redeemed within the first year of purchase.

[2] For one year.

[1] "Other Expenses" are based on estimated amounts for the current fiscal year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	AMERICAN GROWTH FUND INC
Prospectus Date	rr_ProspectusDate	Nov. 29, 2012
American Growth Fund Series Two
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Risk Return Summary
Objective [Heading]	rr_ObjectiveHeading	Investment Objectives/Goals
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund´s primary objective is growth of capital.
Expense [Heading]	rr_ExpenseHeading	Fee Table
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the American Growth Fund. More information about these and other discounts is available from your financial professional and in How to Reduce your Sales Charge, page 8 of the Fund´s prospectus and under Distribution of Fund Shares, Page 14 of the Fund´s statement of additional information.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES: (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment):
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund´s performance.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the American Growth Fund.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	"Other Expenses" are based on estimated amounts for the current fiscal year.
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund´s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	You would pay the following expenses if you did not redeem your shares:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Investment Research Corporation (the "Adviser") manages the Fund using a growth style of investing. We use a consistent approach to build the Fund´s security portfolio which is made up primarily of common stocks and securities convertible into common stock. These securities are issued by large companies, and to a lesser extent, small and mid-sized companies. When a company´s fundamentals are strong, we believe earnings growth will follow.
Risk [Heading]	rr_RiskHeading	Principal risks of investing in the Fund
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The primary risks of investing in the Fund are: Stock Market Risk - the value of an investment may fluctuate, Industry and Security Risk - risks relating to an industry as a whole or a company´s prospects for business success, Management Risk - risks that the Adviser´s assessment of a company´s growth prospects may not be accurate, Liquidity Risk - a given security or asset may not be readily marketable, Small Cap Risk - small cap stocks tend to have a high exposure to market fluctuations and failure, Mid Cap Risk - mid cap stocks tend to have a greater exposure to market fluctuations and failure. Convertible Security Risk - risk of loss of principal at maturity. Loss of some or all of the money you invest is a risk of investing in the Fund.
Risk Lose Money [Text]	rr_RiskLoseMoney	Loss of some or all of the money you invest is a risk of investing in the Fund.
American Growth Fund Series Two | Class E
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load) as a percentage of original purchase price or redemption proceeds, whichever is lower	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[1]
Maximum sales charge (load) imposed on reinvested dividends	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fees	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Maximum Account Fee	rr_MaximumAccountFeeOverAssets	none
Management Fees	rr_ManagementFeesOverAssets	1.00%
Distribution and Service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses	rr_OtherExpensesOverAssets	5.08%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	6.38%
1 Year	rr_ExpenseExampleYear01	1,172
3 Years	rr_ExpenseExampleYear03	2,342
1 Year	rr_ExpenseExampleNoRedemptionYear01	1,172
3 Years	rr_ExpenseExampleNoRedemptionYear03	2,342
American Growth Fund Series Two | Class F
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) as a percentage of original purchase price or redemption proceeds, whichever is lower	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[3]
Maximum sales charge (load) imposed on reinvested dividends	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fees	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Maximum Account Fee	rr_MaximumAccountFeeOverAssets	none
Management Fees	rr_ManagementFeesOverAssets	1.00%
Distribution and Service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	5.14%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	7.14%
1 Year	rr_ExpenseExampleYear01	806
3 Years	rr_ExpenseExampleYear03	2,074
1 Year	rr_ExpenseExampleNoRedemptionYear01	706
3 Years	rr_ExpenseExampleNoRedemptionYear03	2,074

[1] Purchases of Class E shares in amounts of $1,000,000 or more which are not subject to an initial sales charge generally will be subject to a contingent deferred sales charge of 1.0% of amounts redeemed within the first year of purchase.

[2] "Other Expenses" are based on estimated amounts for the current fiscal year.

[3] For one year.

XML

Document and Entity Information	12 Months Ended
	Nov. 29, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Jul. 31, 2012
Registrant Name	AMERICAN GROWTH FUND INC
Central Index Key	0000005138
Amendment Flag	false
Document Creation Date	Nov. 29, 2012
Document Effective Date	Nov. 29, 2012
Prospectus Date	Nov. 29, 2012