more formulas

Other than the common formula and also rule of 72, these are useful formulas too ...

Compound Interest Future Value

FV = PV * ( 1 + i )^N

PV = present value
FV = future value (maturity value)
i = interest rate in percent per period
N = number of periods

Annuity

FV = PMT * [ ( ( 1 + i )^N - 1 ) / i ]

FV = future value (maturity value)
PMT = payment per period
i = interest rate in percent per period
N = number of periods

Simple Interest Amortized Loan Formula

PV * ( 1 + i )^N = PMT * [ ( 1 + i )^N - 1 ] / i

PMT = the payment per period
i = interest rate in percent per period
PV = loan / mortgage amount
N = number of periods

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