# Time period needed to double money

## Description

The present value formula can be rearranged logarithmic way to calculate how many years are needed for the value of the deposit to double. ( For the period of time needed to double an investment, the Rule of 72 is a useful short-cut that gives a reasonable approximation of the period needed).

Related formulas## Variables

t | Time to double money in years (not necessarily an integer) (dimensionless) |

FV | Future value (dimensionless) |

PV | Present value (dimensionless) |

i | Interest (annual) (dimensionless) |