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Rule of 72 Calculator By Years

How It Works

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.

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.