Calculators
Simple Interest Calculator
Interest on principal, rate & time.
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Interest
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Total amount
▸ Interest per period
| Period | Interest | Balance |
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This free simple interest calculator uses the classic formulaI = P × R × T to find the interest on a principal amount at a fixed annual rate over a period of time, plus the total repayable. It is ideal for short-term loans and quick estimates. All maths runs in your browser.
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