Rule of 72 Calculator

Quickly estimate how long it takes for your investment to double, or what return rate you need to double your money in a specific time frame.

Calculate Doubling Time

Choose your calculation mode

What is the Rule of 72?

A simple mental math formula to estimate doubling time. Divide 72 by your return rate to get approximate years, or divide 72 by years to get the required rate. Most accurate for rates between 6-10%.

Enter a value to see results