Finance
Interest Calculator
Calculate simple and compound interest.
Interest earned
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Total amount
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FAQ
- What is the difference between simple and compound interest?
- Simple interest is calculated only on the principal: I = P * r * t. Compound interest is calculated on the principal plus accumulated interest each period: A = P * (1 + r/m)^(m*t), so the balance grows faster the more frequently it compounds.
- What does "compounds per year" mean?
- It is the number of times interest is added to the balance each year. Common values are 1 (annually), 2 (semi-annually), 4 (quarterly), 12 (monthly), and 365 (daily). More frequent compounding results in slightly more interest earned.
- Is my data sent anywhere?
- No. All calculations run entirely in your browser; nothing is uploaded to any server.