Finance & Business Tools
Simple Interest Calculator
Calculate simple interest over time. Principal x rate x time.
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What is Simple Int.?
Simple interest is calculated only on the principal, not on accumulated interest. Useful for short-term loans and some bonds.
How it works
We compute I = P x r x t where P is principal, r is annual rate, t is time in years, and show the total P + I.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.