Simple Interest Calculator
Calculate simple interest and total from principal and rate.
Interest
750
Total amount
5,750
The simple interest formula
Simple interest is calculated only on the original principal, never on accumulated interest: I = P × R × T ÷ 100, where P is the principal, R the annual rate, and T the time in years. It's common for short-term loans, car finance, and some bonds. For interest that earns interest on itself, use a compound interest calculator instead. All math runs locally in your browser.
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