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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName AMERICAN GROWTH FUND INC
Prospectus Date rr_ProspectusDate Nov. 30, 2017
Supplement [Text Block] agfi_SupplementTextBlock

American Grown Fund, Inc.

American Growth Fund Series One

 

Supplement dated May 21, 2018, to the Prospectus dated November 30, 2017

 

This Supplement replaces certain information contained in the Prospectus of American Growth Fund Series One dated November 30, 2017.

 

Effective immediately, the table that follows the bar chart in the section titled “Risk/Return Bar Chart and Table” is deleted and replaced with the following:

 

Average annual total returns for the periods ended December 31, 2016

One Year

Five Years

Ten Years

    

Class A Return before taxes*

4.31%

11.75%

2.40%

Class B Return before taxes*

4.94%

12.03%

2.85%**

Class C Return before taxes*

8.76%

12.26%

2.26%

Class D Return before taxes*

4.29%

11.99%

2.71%

Class D Return after taxes on Distributions

4.29%

11.99%

2.71%

Class D Return after taxes on Distributions and Sale of Fund Shares

2.28%

9.82%

2.12%

Standard and Poor’s 500 Index (reflects no deduction for fees expenses, or taxes)

11.96%

14.66%

6.95%

 

* Assumes redemption at end of time period.
** After seven years Class B Shares convert to Class A Shares. The ten year return for Class B reflects the first seven year returns for Class B and the remaining 3 years as Class A.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;
Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.
AMERICAN GROWTH FUND Series One  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] agfi_SupplementTextBlock

American Grown Fund, Inc.

American Growth Fund Series One

 

Supplement dated May 21, 2018, to the Prospectus dated November 30, 2017

 

This Supplement replaces certain information contained in the Prospectus of American Growth Fund Series One dated November 30, 2017.

 

Effective immediately, the table that follows the bar chart in the section titled “Risk/Return Bar Chart and Table” is deleted and replaced with the following:

 

Average annual total returns for the periods ended December 31, 2016

One Year

Five Years

Ten Years

    

Class A Return before taxes*

4.31%

11.75%

2.40%

Class B Return before taxes*

4.94%

12.03%

2.85%**

Class C Return before taxes*

8.76%

12.26%

2.26%

Class D Return before taxes*

4.29%

11.99%

2.71%

Class D Return after taxes on Distributions

4.29%

11.99%

2.71%

Class D Return after taxes on Distributions and Sale of Fund Shares

2.28%

9.82%

2.12%

Standard and Poor’s 500 Index (reflects no deduction for fees expenses, or taxes)

11.96%

14.66%

6.95%

 

* Assumes redemption at end of time period.
** After seven years Class B Shares convert to Class A Shares. The ten year return for Class B reflects the first seven year returns for Class B and the remaining 3 years as Class A.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;
Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.
Performance Table Heading rr_PerformanceTableHeading Average annual total returns for the periods ended December 31, 2016
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes;
Actual after-tax returns depend on an investor´s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.
AMERICAN GROWTH FUND Series One | Class A  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 4.31% [1]
Five Years rr_AverageAnnualReturnYear05 11.75% [1]
Ten Years rr_AverageAnnualReturnYear10 2.40% [1]
AMERICAN GROWTH FUND Series One | Class B  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 4.94% [1]
Five Years rr_AverageAnnualReturnYear05 12.03% [1]
Ten Years rr_AverageAnnualReturnYear10 2.85% [1],[2]
AMERICAN GROWTH FUND Series One | Class C  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 8.76% [1]
Five Years rr_AverageAnnualReturnYear05 12.26% [1]
Ten Years rr_AverageAnnualReturnYear10 2.26% [1]
AMERICAN GROWTH FUND Series One | Class D  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 4.29% [1]
Five Years rr_AverageAnnualReturnYear05 11.99% [1]
Ten Years rr_AverageAnnualReturnYear10 2.71% [1]
AMERICAN GROWTH FUND Series One | Return after taxes on Distributions | Class D  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 4.29%
Five Years rr_AverageAnnualReturnYear05 11.99%
Ten Years rr_AverageAnnualReturnYear10 2.71%
AMERICAN GROWTH FUND Series One | Return after taxes on Distributions and Sale of Fund Shares | Class D  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 2.28%
Five Years rr_AverageAnnualReturnYear05 9.82%
Ten Years rr_AverageAnnualReturnYear10 2.12%
AMERICAN GROWTH FUND Series One | Standard and Poor’s 500 Index (reflects no deduction for fees expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 11.96%
Five Years rr_AverageAnnualReturnYear05 14.66%
Ten Years rr_AverageAnnualReturnYear10 6.95%
[1] Assumes redemption at end of time period.
[2] After seven years Class B Shares convert to Class A Shares. The ten year return for Class B reflects the first seven year returns for Class B and the remaining 3 years as Class A.