Most investors focus on the percentage of their returns, but rarely on the most important metric: How long will it take for my wealth to double?
The Rule of 72 is a simple mental shortcut to estimate your doubling time. Just divide 72 by your expected annual return.
The Math of Time This simple lens turns abstract percentages into real timelines, helping you compare opportunities with far greater clarity:
- At 12% return, your money doubles in 6 years.
- At 8% return, it takes 9 years.
- At 4% return, it takes 18 years.
Why It Matters Small differences in returns aren’t just about “more money”—they are about years gained or lost. A 4% difference in performance can mean reaching your financial goals an entire decade sooner.
The real insight is not just about the return itself, but the speed of compounding.
Ultimately, your returns define how quickly your “future” arrives.
72 / Annual Return % = Years to Double
