Rule of 72: How Long to Double Money at 12%
How many years it takes to double an investment at a 12% annual return, using the Rule of 72.
At a 12% annual return, an investment doubles in approximately 6.0 years.
Years to double
6.0 years
at 12% p.a.
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It is a bit less precise at 12% than at 8%, since the approximation is calibrated closest to the 6-10% range, but it is still a reasonable quick estimate. Use the Compound Interest Calculator if you need an exact figure.
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The Rule of 72 is an approximation, most accurate for rates between 6% and 10%. For a precise doubling time at any rate, use the Compound Interest Calculator.