FINANCIAL CALCULATORS
Compound Interest Calculator
See how savings grow with compound interest and regular contributions.
100% free
No sign-up
Private — runs in your browser
Instant results
KEY TAKEAWAYS
- See how savings grow with compound interest and regular contributions.
- Free to use — no sign-up, no account and no usage limits.
- Runs entirely in your browser, so the numbers you enter stay private.
- Works on desktop and mobile with instant, accurate results.
Last updated: June 2026
About the Compound Interest Calculator
Enter a starting principal, interest rate, compounding frequency and an optional monthly contribution to project the future value and total interest earned, with a year-by-year table.
Frequently asked questions
How does compounding frequency change the result?
More frequent compounding (daily vs annually) earns slightly more because interest starts earning interest sooner.
Are contributions added before or after interest?
Contributions are applied each month and then grow with the balance, matching how most savings and retirement accounts work.
Free online tool from ConvertFleet. Calculations run entirely in your browser — nothing you type is sent anywhere. Results are estimates for general guidance only.