Rule of 72 Calculator
Estimate how fast money doubles: enter a return rate to get the years, or a number of years to get the required rate.
Doubling time (Rule of 72)
—
Exact doubling time
—
Required rate for your years
—
Frequently asked questions
How accurate is the Rule of 72?
Very accurate for typical returns between roughly 4% and 15% a year. The calculator also shows the exact doubling time next to the estimate so you can compare.