Calculating Rule of Seventy Two

 Rule of 72 Calculator

An online rule 72 calculator tells you, how long it will take to double an investment.

Detailed Output   

Rule of 72 Formula

The rule of 72 is a quick approximation of how long it will take to double an investment.

R x T = 72

Where,

T = Number of Periods, R = Interest Rate as a percentage

Interest Rate required to double your investment R = 72 / T

Number of Periods to double your investment T = 72 / R