Here’s how the Rule of 72 works: Divide 72 by your expected annual interest rate (as a percentage, not a decimal). The answer is roughly the number of years it will take for your money to double. For ...

The rule of 70 is a tool that approximates how long it will take for a variable to double in value. Find out how to calculate and when to use it.

The growth rate of an investment shows how much its value increases over time, helping to evaluate performance. A common way to calculate this is by using the compound annual growth rate (CAGR), which ...