Rule of 72 Calculator

Quick Doubling Estimate

The Rule of 72 estimates how long it takes money to double at a fixed annual return.

Formula: years to double = 72 / annual rate.

Understanding Rule of 72

1. What This Calculator Measures

The Rule of 72 is a quick estimate for how long money takes to double.

2. How the Calculation Works

The calculator divides 72 by the annual return rate and also shows an exact compound-interest comparison.

3. Formula or Rule Used

years to double = 72 / annual rate.

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