Rule of 72 Calculator
The Rule of 72 estimates how many years it takes to double your investment by dividing 72 by the annual rate of return.
%
$
Your money doubles in
10.3years
$10,000 → $20,000
Compare Scenarios
Savings Account
1% annual return
72.0years
$10,000 → $20,000
Bonds
4% annual return
18.0years
$10,000 → $20,000
Stock Market
7% annual return
10.3years
$10,000 → $20,000
This calculator is for educational purposes only. The Rule of 72 is an approximation that works best for returns between about 4% and 12%. Actual investment returns vary and past performance does not guarantee future results.