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Rule of 72 Calculator
Estimate the years required for money to double at a given annual return.
About this calculator
The Rule of 72 is a mental-math approximation: divide 72 by the annual percentage return. It is most useful as a quick estimate, not a projection or guarantee.
How to use it
Enter your information in the fields above. Results update automatically as you change the values, making it easy to compare different scenarios.
Important: This calculator provides estimates for planning and educational purposes. Actual rates, fees, taxes and results can vary. It is not financial, tax, legal or investment advice.