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Compound Interest Calculator
Discover how a starting amount and regular deposits grow over the years, and how much of the final balance is interest.
Free, no sign-up. Runs in your browser: nothing is uploaded.
How to use Compound Interest Calculator
- Enter the starting amount, rate and years.
- Add a monthly contribution if you make one.
- Read the final balance and the yearly chart.
Features
- Yearly, quarterly, monthly or daily compounding
- Monthly contributions
- Year-by-year table and chart
- Interest vs. deposits
Supported formats
You get
- CSV
Private by design
Your files are opened and processed by your browser on this device. They are never uploaded to openWorkstand or anyone else, so the Compound Interest Calculator is safe for contracts, IDs, photos and work documents, and it keeps working offline once the page has loaded. How local processing works
Good to know
- Results are estimates for planning. For important financial or health decisions, confirm the numbers with your lender, tax office or doctor.
- Real returns vary year to year; taxes and inflation are not included.
When to use the Compound Interest Calculator
- Plan savings for a goal.
- See how monthly deposits grow over time.
- Compare interest rates side by side.
Troubleshooting
The file does not open
Check that it is one of the supported formats above and opens in another app. Damaged files and password-protected PDFs cannot be read until they are repaired or unlocked.
It is slow or stops on a very large file
Everything runs on your device, so speed depends on its memory. Close other tabs, use a computer rather than a phone, or split the file into smaller parts first.
The download did not start
Look for your browser’s download bar or icon. Some browsers ask once before a site may download files; allow it and click the button again.
Frequently asked questions
What is the compound interest formula?
A = P(1 + r/n)^(nt), where P is the principal, r the annual rate, n compounding periods per year and t the number of years. Contributions are added each month.
How accurate is this?
The calculator uses the standard formula shown on the page and rounds only for display. Real offers can differ because of fees, rounding rules or changing rates, so treat results as estimates.
Keep working with the result
After you download, choose “Save to Workstand” to keep the result in a folder on your computer, attach it to a project and create a follow-up task. It is saved by your browser, not uploaded.