Rule of 72 Calculator
Estimate how long it takes for an investment to double using the Rule of 72
Result
About the Rule of 72
The Rule of 72 is a simple way to estimate how long an investment will take to double given a fixed annual rate of return. Divide 72 by the annual interest rate to get the approximate number of years required. You can also rearrange it to find the rate needed to double your money within a set number of years.
Example
At an 8% annual interest rate, it will take approximately 9 years (72 ÷ 8 = 9) for your investment to double. To double in 9 years instead, you would need a rate of about 8% (72 ÷ 9 = 8).
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Disclaimer: This calculator provides estimates for educational purposes only. Results do not account for taxes, fees, inflation, or market fluctuations. Actual investment returns may vary. Consult with a qualified financial advisor before making investment decisions.