Investment Doubling Time Calculator

Enter a nominal annual rate and compounding frequency to calculate exact mathematical doubling time and compare a Rule-of-72 estimate.

Nominal annual rate (%)

Compounding

—Exact doubling time

—Rule of 72 estimate

—Effective annual yield

—Estimate difference

—Assumes a constant nominal rate and reinvestment. Actual returns are not constant or guaranteed.

How to use this Investment Doubling Time Calculator

Enter a positive nominal annual rate and choose compounding frequency to calculate exact mathematical doubling time.

Enter a nominal annual rate and compounding frequency to calculate exact mathematical doubling time and compare a Rule-of-72 estimate.

Assumes a constant rate, reinvestment, and no taxes or fees. It is a mathematical scenario, not a return forecast.