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Rule of 72 Calculator


How It Works

YEARS

The Rule of 72 is a way to estimate how long it will take for an investment to double at a given interest rate, assuming a fixed annual rate of interest. You simply take 72 and divide it by the interest rate number. So, if the interest rate is 6%, you would divide 72 by 6 to get 12. This means that the investment will take about 12 years to double with a 6% fixed annual interest rate.

This calculator flips the 72 rule and shows what interest rate you would need to double your investment in a set number of years. Enter the number of years you'd like an investment to double and see what the interest rate would be to make it happen.






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How It Works

Ineterest rate

The Rule of 72 predicts how long an investment will take to double based on a fixed annual interest rate. The rule is this: 72 divided by the interest rate number equals the number of years for the investment to double in size. For example, if the interest rate is 12%, you would divide 72 by 12 to get 6. This means that the investment will take about 6 years to double with a 12% fixed annual interest rate. Enter a fixed annual interest rate into the calculator to see how long it will take for the investment to double in size.















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