Estimate how long it takes an investment to double at a given return, or the rate you need to double your money by a target date.
Years to Double (Rule of 72)
10.3 yrs
Years to Double (Exact)
10.2 yrs
difference 0.04
Rate Needed to Double in Specified Time
7.2%
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| Rate | Rule of 72 (years) | Exact (years) |
|---|---|---|
| 1% | 72.0 | 69.7 |
| 2% | 36.0 | 35.0 |
| 3% | 24.0 | 23.4 |
| 4% | 18.0 | 17.7 |
| 5% | 14.4 | 14.2 |
| 6% | 12.0 | 11.9 |
| 7% | 10.3 | 10.2 |
| 8% | 9.0 | 9.0 |
| 9% | 8.0 | 8.0 |
| 10% | 7.2 | 7.3 |
| 12% | 6.0 | 6.1 |
| 15% | 4.8 | 5.0 |
| 20% | 3.6 | 3.8 |
The Rule of 72 stays within a few months of the exact doubling time for rates between 6% and 10%.
Results are estimates only and should not be considered financial advice. Always consult a qualified professional before making financial decisions.
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