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Rule of 72 Calculator

Annual return (%)

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How it is calculated

Years to double ≈ 72 ÷ rate
Exact: ln 2 ÷ ln(1 + rate)

Projections are illustrations, not guarantees. Taxes and fees are not included unless stated.

FAQ

Why 72?

72 is close to 100 × ln 2 (69.3) adjusted for typical rates and has many divisors, making mental maths easy. It is most accurate around 6–10%.

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