Compound interest calculator
See how a starting amount and monthly deposits grow with compound interest over time.
🔒 Everything runs in your browser. Nothing you choose or type is uploaded. How to verify
How to use it
- Enter the starting amount and the monthly deposit.
- Enter the yearly rate and the number of years.
- Read the final value and the interest earned.
Handy for
Seeing how savings or investments could grow with regular deposits.
Good to know
The results illustrate a fixed rate and are not a forecast. Starting early matters because interest earns interest.
Privacy: where the work happens
Everything you enter or choose is processed by JavaScript in your browser and never sent anywhere. Only the page code, and any library this tool needs, is downloaded from cdnjs or jsDelivr.
Questions
How often does interest compound?
Monthly, with deposits made at the end of each month.
Are taxes and inflation included?
No. Results are before taxes and inflation, and real returns vary from year to year.