Interest Calculator
Compute simple or compound interest on investments or loans, with flexible compounding frequency.
Interest Summary
Interest Earned–
Total Maturity Amount–
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Simple vs compound interest
Simple interest is calculated only on the original principal: I = P × r × t. Compound interest is calculated on the principal plus accumulated interest: A = P(1 + r/n)^(n×t), where n is how often interest compounds each year. This generic tool is different from product-specific calculators like FD, SIP or RD — use it first when you want a quick answer for any loan or investment.