Rule of 72 at 8% Interest – Years to Double Your Money
At an 8% annual rate, your money doubles in approximately 9 years using 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.
The Rule of 72 at 8% shows that your investment will double in roughly 9 years — a useful benchmark for stock market returns.