# The Rule of 72

How long will it take for your money to double? Are you keeping up with inflation?

## How Long Will It Take For Your Money To Double?

The "Rule of 72" estimates how long it will take an investment to double your money at a given interest rate.

### Rule of 72 Calculator

Alternatively, you can calculate what interest rate you need to double your investment within a certain time period. For example, if you wanted to double your money in 5 years, divide 72 by 5 and you'll need to earn 14.4% interest annually on your investment for 5 years: 14.4 × 5 = 72

### Rule of 72 Formula

The Rule of 72 is a simple way to estimate a compound interest calculation for doubling an investment. The formula is interest rate multiplied by the number of time periods = 72:

**R * t = 72**

- R = interest rate per period as a percentage
- t = number of periods

* Interest Rate: *The annual nominal interest rate of your investment in percent.

*The number of years the money will remain invested.*

__Time Period in Years__:*This calculator assumes the frequency of compounding is once per period and that accrued interest is compounded over time.*

__Compounding__:### Based On Your Age How Many Doublings Will You Experience in Your Lifetime?

- The money you earn today won't be the value of what you'll be required to live off tomorrow
- Are you accounting for inflation & the doubling that occurs?