
The Rule of 72 is a simple way to estimate how long it will take for your investment to double. Just divide 72 by your annual return rate.
Fact!
It’s simple math—but the lesson is big: the sooner you start, the more time compounding has to work for you.
For example, with a 6% return, your money doubles every 12 years (e.g., 72 ÷ 6 = 12 years for a 6% return).
If you invest $20,000 at age 25, it could grow to roughly $160,000 by age 61 (doubling 3 times). But if you wait until age 37, that same $20,000 will grow to around $80,000 by 61.
You don’t need to time the market. You need time in the market.