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Compound Interest Calculator — Free Online Calculator
Compound Interest solves A = P(1 + r/n)ⁿᵗ — A = final amount, P = principal, r = annual rate, n = compounds per year, t = years. Enter your known values and the calculator solves for the rest instantly. All processing happens client-side in your browser, with nothing sent to a server. Free, unlimited, and no registration needed.
How to use Compound Interest
- Enter your known values in the fields.
- The result updates instantly as you type.
- Copy or note down the result.
Frequently asked questions
- What formula does Compound Interest use?
- A = P(1 + r/n)ⁿᵗ — A = final amount, P = principal, r = annual rate, n = compounds per year, t = years.
- Can I use it on my phone?
- Yes. The layout adapts to small screens and behaves the same on mobile as on desktop.
- Is my input saved anywhere?
- No. Values stay in your browser and are gone as soon as you close the tab.
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