Compound interest calculator
See how a principal grows with compound interest, optional monthly contributions and any compounding frequency.
Interest compounds at the chosen frequency; contributions are spread evenly across each period.
How to use
Compound interest calculator lets you see how a principal grows with compound interest, optional monthly contributions and any compounding frequency. Enter your numbers in the fields and the result updates instantly as you type — no button to press.
It uses standard formulas and shows the result immediately; you can copy any value with one click. It's completely free, with no sign-up, no watermarks and no limits on how often you use it.
Examples
Change any input and every figure recalculates live, so you can compare scenarios in seconds.
Once compound interest calculator shows your output, use the copy or download button to grab it — no retyping.
Frequently asked questions
Is Compound interest calculator free to use?
Yes. Compound interest calculator is completely free with no sign-up, no watermarks and no usage limits.
Is my data private?
Yes. It uses standard formulas and shows the result immediately; you can copy any value with one click.
Does Compound interest calculator work on mobile?
Yes. It works in any modern browser on desktop, tablet or phone, and keeps working offline once the page has loaded.
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