72
Rule of 72 Calculator
How many years money takes to double at a yearly rate: the Rule of 72 estimate beside the exact answer.
Result…
How it's calculated
Rule of 72: years ≈ 72 ÷ rate (%) Exact: years = ln 2 ÷ ln(1 + rate)
A mental shortcut: divide 72 by the yearly percentage rate to estimate the doubling time. It is most accurate around 8%; at very low rates 70 or 69.3 is closer. The exact figure uses logarithms.
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