On this page is a *doubling time calculator*. Enter a rate of return in percentage form, and the tool will tell you how many periods at that rate of return it'll take something to double.

## Doubling Time Calculator

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## Doubling Time Formula

The doubling time formula is:

doubling\ time=\frac{\ln(2)}{\ln(1+rate)}

Where *rate* is the percentage increase you expect per period, expressed as a decimal (for example, 5% would be ".05"). Doubling time, then, is the number of those periods it'd take for a quantity to double.

## Using the Doubling Time Calculator

The doubling time calculator has a fixed endpoint, so merely enter how quickly an investment or quantity is appreciating. If you enter a negative return, the calculator will let you know how many periods in the past the amount was twice as high assuming a constant negative return.

Also, try the tripling time calculator and quadrupling time calculator.

*Next, visit our other calculators and tools.*