Rule of 72 calculator
Use the rule of 72 shortcut and the exact logarithmic answer to find the doubling time of an investment.
7.0%
$
Years to double
10.3 yr
Rule of 72 shortcut
Exact answer
10.2 yr
- Doubles to
- $50,000
- Quadruples after
- 20.5 yr
- Eight-fold after
- 30.7 yr
How this is calculated
- · Returns are constant
- · No tax or fees
Estimates only — not financial, tax or legal advice.