# Compound Interest Calculator

 Choose a calculation: Find A given P, i and n Find i given P, A and n Find P given A, i and n Principal (P): \$ Interest Rate per Period (i): % Number of Periods (n): Final Value: \$ 0.00
This Calculation Equation:
A = P(1 + i)n
Where:
A = Final Investment Value
P = Principal Invested
i = Interest Rate per Period n
n = Number of Periods

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

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