Doubling Time Calculator

Doubling time calculator calculates how long for your investment to be doubled with a certain growth rate or return rate.

Doubling Time Formula

The doubling time formula is:
T=log(2)/log(1+Rate)

For example,
if the return rate of your investment is 8% annually, it needs about 9 years for the principal to be doubled.

It is calculated as :
log(2)/log(1+8/100)
=9 years.

To prove it:
if the principal amount of your investment is $100, the total after 9 years of an 8% return rate will calculated as:
100 x(1+0.08)⁹
=200.