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Rule of 72

Estimate how long it will take for an investment to double at a given annual rate of return.

Inputs
Adjust the values below to calculate your results
Investment Growth ($1 Initial)
%
Results
Your calculated results based on the inputs provided

Years to Double

10.3

Exact (Log Formula)

10.2

ln(2) / ln(1 + 7%)

Rule of 72

72 ÷ 7% = 10.3 years

10-Year Growth

1.97×

$1 grows to $1.97 at 7%