Rule of 72 Calculator

Calculate how long it takes to double your investment using the Rule of 72. Also includes Rule of 114 and Rule of 144.

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Important Financial Disclaimer

This calculator provides estimates based on standard financial formulas from verified references. Results are for informational and educational purposes only and should not be considered as professional financial, investment, or tax advice.

For important financial decisions such as loans, investments, mortgages, retirement planning, or tax matters, please consult with qualified financial advisors, certified financial planners, or licensed tax professionals who can review your specific situation.

Calculations may not account for all variables specific to your circumstances, local regulations, or current market conditions. Always verify results and consult professionals before making financial commitments.

Not a substitute for professional financial advice

Investment Details

8%
1%30%
$10,000
$1,000$10,00,000
10 years
1 years30 years

Years to Double (Rule of 72)

9.0 years

Exact: 9.01 years

Years to Triple
14.3 yrs

Exact: 14.27

Years to Quadruple
18.0 yrs

Exact: 18.01

Doubled Amount
$20,000
Tripled Amount
$30,000

Rate Needed to Double in 10 Years

Rule of 72 Estimate7.20%
Exact Rate7.18%

The Rule of 72

Years to Double = 72 / Interest Rate
Rule of 72

Years to 2x

Rule of 114

Years to 3x

Rule of 144

Years to 4x

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