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Finance

Rule of 72 (Doubling Time)

Estimate the number of years required to double your investment at a given annual interest rate.

Inputs

0.5100

Calculation Results

Years to Double (Rule of 72)

9

Exact Years to Double

9.01

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Formula & Mathematical Explanation

t≈72R\displaystyle t \approx \frac{72}{R}

The Rule of 72 states that the time to double (t) is approximately equal to 72 divided by the annual interest rate (R).

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