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Simple Interest Calculator

Calculate total interest earned or payable without compounding.

Enter values above to calculate.

How to Use This Tool

  • 1Enter your initial principal sum or baseline capital amount.
  • 2Input the annual fixed interest rate (%) and total duration in years.
  • 3Click Calculate Simple Interest to instantly see total interest accrued and future value.

How the Simple Interest Calculator Works

Enter the principal amount, annual interest rate, and time period. The calculator calculates interest without adding previously earned interest back into the principal.

Formula

Calculation formula Simple Interest (SI) = (P × R × T) ÷ 100. Total Amount = P + SI, where P is principal, R is annual rate in percent, and T is time in years.

Instructions

  1. Enter the principal amount.
  2. Enter the annual interest rate.
  3. Enter the time period in years.
  4. Click Calculate Simple Interest to see interest and total amount.