About the Money Doubling Calculator (Rule of 72)
The Rule of 72 is a quick way to estimate how long an investment takes to double: divide 72 by the annual return. Enter an expected return and this calculator shows the approximate doubling (and tripling) time.
How the Rule of 72 works
Years to double ≈ 72 ÷ annual return (%). At 12%, money doubles in about 6 years; at 8%, about 9 years. It’s a mental shortcut that shows the power of compounding and higher returns — use the compound interest calculator for exact figures.
Money Doubling Calculator (Rule of 72) — frequently asked questions
What is the Rule of 72?
A quick formula: years to double your money ≈ 72 ÷ the annual return (%). At 12% a year, money doubles in roughly 6 years.
Is the Rule of 72 accurate?
It’s a close approximation for typical rates (6–15%). For exact figures, use a compound interest calculator.
How can I double my money faster?
A higher annual return (within your risk appetite) and staying invested longer both help — the Rule of 72 shows how sensitive doubling time is to the rate.