Compound Interest Calculator

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Compound Interest Calculations:

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

Be sure to enter the interest rate per period. For example, if the stated annual rate is 5% and you are compounding monthly then the rate per period is 5% / 12 = 0.417% per period. (the effective interest rate is 5.12%)

Compound Interest Formulas:

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

See also Mathworld on Compound Interest