Simple Interest Calculator

Pop up Simple Interest Calculator

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Simple Interest Calculations:

The basic calculation for this calculator finds A, the Final Investment Value, using the basic simple interest formula: A = P(1 + ni) where P is the Principal amount of money to be invested at an Interest Rate i% per period for n Number of Time Periods.

Simple calculations for interest do not account for compounding. For example, if you want to know the simple interest for 10 years on a principal amount of $100 it is the interest rate times 10 years. So an interest rate of 3% will be $100 * 30% = $130. See also our Compound Interest Calculator.

Simple Interest Formulas:

• Find Final Investment Value given Principal, Interest and Number of Periods
  • A = P(1 + ni)
• Find Number of Periods given Principal, Interest and Final Investment Value
  • n = (1 / i ) (A / P -1)
• Find Interest given Principal, Final Investment Value and Number of Periods
  • i = (1 / n ) (A / P -1)
• Find Principal given Final Investment Value, Interest and Number of Periods
  • P = A / (1 + ni)

See also Mathworld on Simple Interest