How Long to Double Money at 3% – Rule of 72
At a 3% annual return, your money doubles in approximately 24 years according to the Rule of 72.
How to use this tool
- Enter annual rate in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your years to double and the full breakdown beneath it.
See how a 3% savings rate takes about 24 years to double your money using the Rule of 72.