Rule of 72 Calculator
Calculate investment doubling time using the Rule of 72.
The Rule of 72 is a simple way to estimate doubling time: divide 72 by the annual interest rate.
Doubling Time
10.3
years (Rule of 72 estimate)
Exact (compound): 10.24 years
Rate → Doubling Time
1%72.0 years
2%36.0 years
3%24.0 years
4%18.0 years
5%14.4 years
6%12.0 years
7%10.3 years
8%9.0 years
10%7.2 years
12%6.0 years
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