Compound Interest Rate Calculator
Enter the starting amount, the ending amount and the number of years to find the compound annual rate.
- Free
- No sign-up
Enter the starting and ending amounts and years to see the rate.
Worked example
With these example inputs:
- Starting amount$1,000
- Ending amount$2,000
- Number of years6 yr
Compound interest rate: 12.25%
- Total growth100.0%
Frequently asked questions
How is the compound rate calculated?
Divide the ending amount by the starting amount, raise it to one over the years and subtract one. Growing $1,000 to $2,000 over 6 years implies about 12.25% a year.
How does it differ from simple interest?
This rate assumes each year's growth builds on the last, so a balance compounds. A simple rate over the same period would be higher, since it never earns interest on past interest.