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Rule of 72 Calculator
Calculate how long it takes to double your investment using the Rule of 72.
Rule of 72 Calculator
Years to double ≈ 72 ÷ Rate (%) | Exact: ln(2) ÷ ln(1 + r/100)
Results
Rule of 72 Estimate
10.29 years
Exact Doubling Time
10.24 years
At a rate of 7.00%: your investment doubles in approximately 10.29 years.
Common Rates — Doubling Time Reference
| Rate (%) | Years to Double (Rule of 72) |
|---|---|
| 1% | 72.00 years |
| 2% | 36.00 years |
| 3% | 24.00 years |
| 4% | 18.00 years |
| 5% | 14.40 years |
| 6% | 12.00 years |
| 7% | 10.29 years |
| 8% | 9.00 years |
| 9% | 8.00 years |
| 10% | 7.20 years |
| 12% | 6.00 years |
| 15% | 4.80 years |
| 18% | 4.00 years |
| 20% | 3.60 years |
| 24% | 3.00 years |
| 25% | 2.88 years |