Compound Interest Calculator
Compute investment growth with compound interest. Enter your values, click Calculate, and get the full result with its breakdown — everything is processed on your device, nothing is sent to a server.
All calculations run in your browser. Your data is never sent to our servers.
Example
Example Input
1000 at 5%, 10 yr, monthly
Example Output
~1647.01
How to Use
- 1Fill in each input field with the values you want to compute.
- 2If there are choices (units, mode, operation), pick what you need.
- 3Click the Calculate button (or press Ctrl+Enter).
- 4The main result and its breakdown appear in the Result area. Click Copy to copy it.
About the Compound Interest Calculator
The Compound Interest Calculator computes the final balance with A = P(1 + r/n)^(nt): principal P, annual rate r, compounding frequency n per year, over t years. It shows the final balance and total interest.
Compound interest grows investments faster over time because interest also earns interest.
FAQ
Is this Compound Interest Calculator accurate?
Yes. It uses standard formulas and runs directly in your browser at full JavaScript precision (plus BigInt/decimal.js for large numbers where needed).
Is my data sent to a server?
No. All calculations happen entirely on your device. No values are sent to or stored on our servers.