Calcometry
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Rule of 72 Calculator
Quick mental math shortcut: years to double ≈ 72 ÷ annual return %.
Annual return
Years to double
9 yrs
Years to triple: 14.3
- Annual rate
- 8.0%
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Rule of 72
Approximation for compound growth. At 8% return, money doubles in about 9 years (72 ÷ 8).
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