## Compound Interest Calculator

This calculator will calculate values for compound interest.

### Calculator:

Enter a value in any three of the following fields and press
the "calculate" button. The missing value, or the field
with value of 0, will be calculated.

Interest must be entered as a decimal value (e.g. 5% = .05).
Note that if you fill in all four fields, the future value will
be updated with the correct value.

### Equations:

FV = PV*(1 + r)^{n}

PV=FV/(1+r)^{n}

n = log(FV / PV) / log(1+r)

r = (FV/PV)^{1/n} - 1

### Variables:

PV = Present Value

FV = Future Value

r = interest rate (e.g. 5% = .05)

n = number of years

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