This Doubling Time Calculator calculates the time it takes for an investment to double in value given a constant growth rate.

How to calculate doubling time?

Formula: Doubling Time = log(2) / log(1+r)

r = interest rate

Example: If an investment pays 8% interest, how long will it take to double the investment?

Step 1: Plug into formula and solve

log(2) / log(1 + 0.08) = 9.01 years