Simple Interest Calculator

Calculate simple interest using principal, annual rate, and time. See total amount, interest share, and clean formula breakdown.

Calculate Simple Interest

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What is Simple Interest?

Simple interest is calculated only on the original principal amount. It does not add previous interest back into the principal.

  • Formula: SI = P × R × T ÷ 100.
  • P is principal amount.
  • R is annual interest rate.
  • T is time in years.