# FINANCIAL CALCULATIONS

## Try A Few Financial Calculations

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### Compound Interest

Amount: A = P*(1 + r)^{n}

Eff. Rate: ER = (1 + r)^{n} - 1

where P = principal, r = interest per period, n = no. of periods

Principal ($)

Annual Rate of Interest (%)

No. of periods per year

Years

Amount ($)

Effective Annual Rate (%)

### Mortgage Payments

Monthly Payment: R = P * r / (1 - (1 + r)^{-n})

Debt Balance after K payments: D = P * (1 + r)^{k} - R * ((1 + r)^{k} - 1)/r)

where P = principal, r = interest rate per period, n = no. of periods, k = no. of payments

### Accelerating Mortgage Payments

Want to pay more than the monthly payment shown...

See how many months it takes to pay off the mortgage

n = ln[x/(x - Pr)] / ln (1 + r)

### Future Value of an Annuity

Future Value: FV = R * ((1 + r)^{n} - 1)/r)

where R = payment, r = rate of interest, and n = no. of payments

### More Calculators

College Planning Calculator

Maximum Loan Calculator

Loan Calculator

Mortgage Loan Calculator

Retirement Planning Calculator