Find out how long it takes an investment to grow four times bigger, using the Rule of 144 shortcut.
A quadrupling is two doublings, so 144 is simply double the Rule of 72's constant.
Years to quadruple: 144 ÷ annual return %
Is quadrupling just doubling twice?
Yes, exactly. This is why the number 144 is exactly double the number 72 used in the Rule of 72.