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Simple Interest Calculator
Simple interest is calculated only on the original principal amount, making it straightforward to work out by hand — or instantly with this free calculator. Enter your principal amount, annual interest rate, and time period in years to get the interest earned (or owed) and the total amount at the end of the term.
Simple Interest Calculator
Interest earned or owed over a fixed period.
Also known as: interest calculator, principal-rate-time calculator.
Interest
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FAQ
What is the simple interest formula?
Simple Interest = (Principal × Rate × Time) / 100.
How is simple interest different from compound interest?
Simple interest only applies to the original principal; compound interest also earns interest on previously accumulated interest, so it grows faster.