How Long to Double Money at 10% – Rule of 72
At a 10% annual return, your money doubles in approximately 7.2 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.
Apply the Rule of 72 to find that money earning 10% per year doubles in just over 7 years.