Compound Interest Calculator
Projects the future value of savings with compound interest and optional monthly contributions.
Every calculation runs instantly in your browser, so your inputs are never sent to a server, and the tool is free with no sign-up. You can save the results as an Excel file with live formulas and reuse them later.
Inputs
- Initial amount ($)
- Annual return (%)
- Years (years)
- Monthly contribution ($)
Example calculation
Future value: $54,714
| Total contributions | $34,000 |
|---|---|
| Total interest earned | $20,714 |
| Return on contributions | 60.92% |
Method & notes
Monthly compounding, contributions added at month end. Excludes taxes and fees. Estimate.
Tips
Change any input and the result recalculates in real time. After downloading the Excel file, you can reuse it by editing only the yellow input cells.
FAQ
How does the Compound Interest Calculator work?
Projects the future value of savings with compound interest and optional monthly contributions. Monthly compounding, contributions added at month end. Excludes taxes and fees. Estimate.
Can I save the results?
Yes. You can download the results for free as an Excel (.xlsx) file with live formulas that recalculate when you change the yellow input cells.
Is it free?
Yes — all Calcova calculators are free, and you can save results as an Excel file.