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Rule 72 Time to Double Calculator

This calculator uses Rule 72 to estimate how long it will take to double an investment at a given interest rate. Input the annual interest rate, and the calculator will show you the approximate number of years required to achieve your goal.

Calculate the Time to Double Your Investment Using Rule 72

Input Fields
rate
%
Enter the annual rate of return (%)
If enabled, the result will update automatically when you change any value.

Rule 70 Formula for Time to Double

Formula
$$text{Time to Double} = frac{72}{r}$$

Where:

  • r – Annual interest rate (as a percentage)

The Rule of 72 is an easy-to-use rule of thumb for estimating how long it takes for an investment to double, given a fixed interest rate. It is widely applied in personal finance, investing, and savings planning. This rule assumes that interest is compounded periodically (monthly, quarterly, etc.). While it provides a good approximation, the actual time to double will depend on the frequency of compounding.

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