# Rule of 72 Calculator

**Enter all**** values to calculate:**

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## Rule of 72 calculation Formula:

There are 2 things calculated.

Interest rate required to double the investment : R = 72 / T

Number of periods to double the investment : T = 72 / R

Here,

T = Number of Period.

R – Rate of Interest.

Example,

If you want to double your investment of in 7 years. How much interest you must earn in a year ?

R = 72 / T

R = 72 / 7 = 10.2857 %

You will have to earn 10.29% interest to double your investment in 7 Years.

If you earn 5% interest on your investment every year. How many years it will take to double your investment ?

T = 72 / R

T = 72 / 5 = 14.4 Years

It will take 14.4 years to double your investment with 5% interest.