Simple & Compound Interest Calculator
Compare simple vs compound growth
Projections are estimates for information only and are not financial advice. Real returns vary with rates, fees, and compounding terms — verify with your bank or a qualified adviser.
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Processed locally using client-side JavaScript. Your files and data never touch any server.
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No registration, no waiting queues, and no limits on file conversions or generations.
What is Simple & Compound Interest Calculator?
The Interest Calculator projects growth on a principal using either simple or compound interest, so you can see exactly what a saving account, deposit, or informal loan earns over time. Compound mode shows the effect of interest earning interest — the single most important concept in long-term saving.
How to use Simple & Compound Interest Calculator
Enter the principal amount and the annual interest rate.
Set the time period and choose simple or compound interest.
For compound mode, pick the compounding frequency (annually, monthly, or daily).
Compare the simple and compound totals to see what compounding adds over your horizon.
- Both simple and compound modes with adjustable compounding frequency
- Clear split of principal versus interest earned
- Instant, formula-exact results computed on your device
- No account, no limits — free for personal and professional use
- Projecting savings-account or fixed-deposit growth before committing funds.
- Checking what an informal family loan should repay at a fair rate.
- Teaching or learning how compounding frequency changes effective yield.
Frequently Asked Questions
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