The Rule of 72 is a simple way to estimate how long an investment will take to double, given a fixed annual rate of interest.
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Investment Comparison
Compare how different interest rates affect doubling time and future value.
| Rate | Doubling Time | Future Value | Real Value (2.5% inflation) |
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About the Rule of 72
The Rule of 72 is a simplified formula that calculates how long it will take for an investment to double in value, based on its rate of return.
The formula is:
Years to Double = 72 ÷ Interest Rate
For example, at 8% interest, your money will double in approximately 72 ÷ 8 = 9 years.
Limitations
- The Rule of 72 is most accurate for interest rates between 6% and 10%
- It doesn't account for taxes, fees, or additional contributions
- For higher accuracy, use the exact logarithmic calculation
Advanced Calculations
This calculator also provides:
- Exact doubling time calculation using logarithms
- Adjustments for different compounding frequencies
- Inflation-adjusted (real) returns
- Future value projections
Advanced Rule of 72 Calculator (UK Version)
Investment Comparison
Compare how different interest rates affect doubling time and future value.
| Rate | Doubling Time | Future Value | Real Value (2.5% inflation) |
|---|
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