Rule of 72 Calculator

Years to double your money — instantly.

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Years to double10.3

72 ÷ rate = years to double. It's an approximation — accurate within a year for rates of 6-10%.

Divide 72 by your annual return. At 8%, your money doubles every 9 years (72/8). At 4%, every 18 years. It reveals how powerful higher returns are.

It's a close approximation for typical rates. For 8%, the true doubling time is 9.01 years — the rule is within 1%.