Rule of 72 Calculator
Estimate how many years it may take to double an investment, or the annual return needed to double in a target time.
%
Estimated time to double
9.0 years
Based on the Rule of 72 approximation: 72 divided by annual return rate.
Estimated annual return needed
7.2%
Based on the Rule of 72 approximation: 72 divided by years to double.
This is an estimate, not an exact forecast. The Rule of 72 is commonly used as a quick mental shortcut for compound growth.
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