Finance
Rule of 72
Approximate years to double an investment.
Formula
Formula
t ≈ 72rate%
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| rate | annual rate percent | computed result | — | result |
Try it yourself
Interactive calculator
Worked examples
Example 1
Givenrate (%) = 8
Result9
Example 2
Givenrate (%) = 6
Result12