Rule of 72 Calculator

The Rule of 72 is a simple way to estimate how long it will take for your money to double based on a fixed annual rate of return.

To use it, divide 72 by your interest rate:

Years to double ≈ 72 ÷ interest rate

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Try the Calculator

Enter your expected annual return:

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This rule works best for interest rates between 6% and 10% and provides a quick mental shortcut for estimating growth.

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For more detailed projections including monthly contributions:

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