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Simple interest calculator
Calculate interest without compounding from principal, annual rate and a duration in years.
Numbers and dates
Text
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter values using decimal points and choose the operation or assumptions shown.
- Select Calculate and review the numerical result and its stated conventions.
- Download the result or amortization schedule when available. Reset restores the example inputs.
Examples
1,000 at 5% simple annual interest for two years earns 100.
Limitations
- Runs locally. Decimal calculations use floating-point arithmetic, rounded to 12 significant digits; monetary displays use two decimals. Exact integer and fraction results are labelled separately.
- Use one currency throughout. Estimates use your inputs and stated assumptions; fees, taxes, inflation and rate changes are excluded unless explicitly entered. These are calculations, not lending offers or investment forecasts.
- Uses I = principal × annual rate × years. Enter a fractional year explicitly; no banking day-count convention is inferred.
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