Wealth Multiplier (Rule of 72) Calculator
FinanceEstimate how many years it will take to double your money at a given annual interest rate, using the Rule of 72.
Years to Double
Approximate number of years for your investment to double at this rate, using the Rule of 72.
Value After Doubling
$20,000
Your investment's value once it doubles.
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Frequently Asked Questions
What is the Rule of 72?
The Rule of 72 is a quick mental-math shortcut: divide 72 by your annual interest rate to estimate how many years it takes for an investment to double in value. It works well for rates between roughly 4% and 15%.
How accurate is the Rule of 72?
It's a close approximation, not an exact calculation — accuracy is best for moderate interest rates (around 6-10%) and decreases slightly at very high or very low rates. For precise figures, use a full compound interest calculator.
Does this account for taxes or fees?
No, this is a simplified estimate based purely on the stated interest rate. Taxes, fees, and inflation will all reduce your real-world doubling speed.
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