Free Interest Calculator

Simple Interest

Interest on principal only (no compounding)

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Principal amount (NPR)

Interest rate (% per year)

Time unit

Time (years)

Total amount (Principal + Interest)

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Simple interest

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Principal

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Rate—

Time—

Formula usedSI = P × R × T ÷ 100

Simple interest does not compound — interest is only on the original principal. For bank FD / compounding, use the FD or Compound Interest calculator.