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Rule of 72 Calculator
Estimate how many years it takes for money to double at a given annual return, using the classic Rule of 72.
How to use this tool
- 1Paste or type your input above.
- 2The result updates instantly.
- 3Copy the output with one click.
Frequently asked questions
How accurate is the Rule of 72?+
Very good for rates between 4% and 15% β within a few months of the exact answer. The calculator also shows the precise logarithmic result for comparison.
Is my data private?+
Yes. The tool runs entirely in your browser β nothing you paste or type is uploaded to a server.
Learn more
- Rule of 72 Calculator: formula and example
- rule of 72 calculator explained
- Common mistakes with rule of 72 calculator