Rule of 72

Want to know how long it will take to double your money? Use this calculator to get a quick estimate. Simply enter a given rate of return and this calculator will tell you how long it will take for the money to double by using the rule of 72. That rule states you can divide 72 by the rate of return to estimate the doubling frequency.

Fill out either of the two fields below and click “Calculate” to see the computed other value. For example, if you want to know how long it would take to double your money at 10% APR, enter “10” into the Interest Rate box and click calculate.