Calculate interest and total amount using principal, annual rate, and time in years.
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Finance tool
Enter principal, rate, and time
This uses simple interest: principal × annual rate × time. It does not compound interest or provide financial advice.
Your result will appear here after you submit valid values.
How the calculation works
Simple interest equals principal × annual interest rate × time, where the rate is expressed as a percent divided by 100. Total equals principal plus interest.
Conventions and boundaries
Time: entered as years and may be fractional.
Interest: does not compound or account for fees, taxes, deposits, withdrawals, or payment schedules.
Scope: educational arithmetic, not a quote or financial advice.
Version and verification
Calculation version 1.0.0; deterministic fixtures last verified 2026-08-20.