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Rule of 72 Calculator
Use the Rule of 72 to see how many years it takes to double your money at any return rate, with 10-, 20-, and 30-year projections you can compare.
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The Rule of 72 is a quick mental math shortcut: divide 72 by your annual return to estimate how many years it takes to double your money.
S&P 500 ≈ 7% real | savings account ≈ 4–5% | inflation ≈ 3%