Estimate doubling time in seconds.
The Rule of 72 is a practical shortcut: divide 72 by your expected annual return to estimate how many years money may take to double.
Use this rule to estimate doubling speed before you run detailed projections.
The Rule of 72 is an estimation shortcut: divide 72 by annual return rate to estimate years required for money to double.
It turns abstract percentages into real timelines, making returns easier to compare and goals easier to plan.
| Return Rate | Estimated Doubling Time |
|---|---|
| 6% | ~12 years |
| 8% | ~9 years |
| 10% | ~7.2 years |
| 12% | ~6 years |
Use a realistic long-term annual return estimate for your portfolio.
The result is your approximate doubling time in years.
Use the estimate to align investment horizon and contribution strategy.
Enter current amount and expected annual return to see your Rule of 72 estimate.
The chart updates from your amount and return inputs.
Disclaimer: The Rule of 72 is an estimation method and not a performance forecast. Real outcomes vary with return volatility, fees, taxes, and contribution timing.