Glossary term
Rule of 114
The Rule of 114 is a mental-math shortcut for estimating how long money may take to triple at a fixed annual return.
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What Is the Rule of 114?
The Rule of 114 is a mental-math shortcut for estimating how many years it may take money to triple at a fixed annual compound return. It extends the same idea as the Rule of 72, which estimates doubling time.
The rule is approximate. It assumes a steady annual return and does not account for taxes, fees, inflation, deposits, withdrawals, or market volatility.
Key Takeaways
- The Rule of 114 estimates tripling time under compound growth.
- The shortcut divides 114 by the annual percentage return.
- It works best as a rough planning estimate, not a precise forecast.
- Real investment returns are uneven, so actual outcomes can differ materially.
The Formula
The basic shortcut is:
In this formula, the annual return rate is written as a whole-number percentage. For example, use 6 for a 6% annual return.
Annual Return | Approximate Years to Triple |
|---|---|
4% | 28.5 years |
6% | 19 years |
8% | 14.25 years |
10% | 11.4 years |
How to Use It Carefully
The Rule of 114 can help readers build intuition about compounding. It shows that small differences in return assumptions can create large differences over long periods.
The shortcut is less useful for short holding periods, volatile investments, changing interest rates, or accounts with regular contributions and withdrawals. It also does not show purchasing power. An account can triple in nominal dollars while inflation reduces what those dollars buy.
Rule of 114 Versus Rule of 72
The Rule of 72 estimates how long money may take to double. The Rule of 114 estimates how long money may take to triple. The Rule of 144 estimates quadrupling time. All three are approximations built around compound growth.
The Bottom Line
The Rule of 114 is a quick way to estimate tripling time, but it is not a substitute for a real return, tax, fee, and inflation analysis. It is most useful for understanding the scale and patience required for compounding.