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Simple Interest Calculator

Free simple interest calculator — compute the interest and final amount for a principal at a given rate over time, in your browser.

PrincipalAnnual rate (%)Time (years)

Runs entirely in your browser — nothing you enter is uploaded or stored.

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Frequently asked questions

Is my data uploaded?

No. This calculator runs entirely in your browser — the numbers you enter are never sent to a server. You can verify it in the Network tab or our Content-Security-Policy.

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