# Doubling Time Calculator

 Growth rate: %

The online Doubling Time Calculator is used to calculate the doubling time for a constant growth rate.

## Doubling Time Definition

In finance, the doubling time is the period of time required for an investment or money in an interest bearing account to double in size or value. It is also applied to population growth, inflation, resource extraction, compound interest, and many other things which tend to grow over time.

## Doubling Time Formula

For a constant growth rate, the doubling time calculation formula is as following:

Td = log(2) / log(1 + r)

Where:
Td = doubling time
r = a constant growth rate

## Doubling Time Table

Some doubling times calculated with the above formula are shown in the following table.

r%Tdr%Tdr%Tdr%Tdr%Tdr%Tdr%Td
0.1693.49 1.163.36 2.133.35 3.122.7 4.117.25 5.512.95 116.64
0.2346.92 1.258.11 2.231.85 3.222.01 4.216.85 6.011.9 126.12
0.3231.4 1.353.66 2.330.48 3.321.35 4.316.46 6.511.01 135.67
0.4173.63 1.449.86 2.429.23 3.420.73 4.416.1 7.010.24 145.29
0.5138.98 1.546.56 2.528.07 3.520.15 4.515.75 7.59.58 154.96
0.6115.87 1.643.67 2.627 3.619.6 4.615.41 8.09.01 164.67
0.799.36 1.741.12 2.726.02 3.719.08 4.715.09 8.58.5 174.41
0.886.99 1.838.85 2.825.1 3.818.59 4.814.78 9.08.04 184.19
0.977.36 1.936.83 2.924.25 3.918.12 4.914.49 9.57.64 193.98
1.069.66 2.035 3.023.45 4.017.67 5.014.21 107.27 203.8