CalculatorFinance

Rule of 72 Calculator

Estimate how many years an investment may take to double at a fixed annual return.

Instant · no account

Input

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Annual return%

Method

How it works

Change any input above and the result updates instantly. The formula or method used by this tool is shown below.

Approximate doubling time = 72 ÷ annual return %

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About this tool

What does the Rule of 72 Calculator do?+

Estimate how many years an investment may take to double at a fixed annual return.

How does this calculator calculate the result?+

It uses this method: Approximate doubling time = 72 ÷ annual return %

Are my inputs saved or sent to an account?+

Core CalcForge tools require no account, and most calculations run locally in your browser. Favorites and recent-tool history, when used, stay in this browser.