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Rule of 72 Calculator by Interest Rate

How It Works

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.

Information and interactive calculators are made available to you as self-help tools for your independent use. We cannot and do not guarantee their accuracy, their applicability to your circumstances or guarantee of credit. We encourage you to seek personalized advice from qualified professionals regarding all personal finance issues.