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.
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
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