Estimate how many years it takes to double your money.
The rule of 72 approximates doubling time by dividing 72 by the annual rate of return. At 8 percent, money doubles in about nine years. It is a fast mental shortcut for comparing investments and appreciating just how powerful compounding is.
Rule of 72
Years to double = 72 / r
Years to double = 72 / r The rule of 72 approximates doubling time by dividing 72 by the annual rate of return. At 8 percent, money doubles in about nine years.
It is a fast mental shortcut for comparing investments and appreciating just how powerful compounding is.
This calculator takes 1 input: Annual rate of return. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.