Here's a link to an online calculator -- free, and nothing to download. There are many useful functions. Thanks to Elizabeth Sadowski for bringing this to my attention.
- Investment Calculators for calculating the rate of return, the amount of interest, present value
- Loan Calculators for calculating the amount of the payments and/or balloon payment, amount of down payment, interest rates, etc.
- Personal Finance Calculators for calculating the cost of an afforable house or car, length of time to pay off a loan
- Retirement Calculators for calculating how much do you have to save to reach your goal
- Schedules - What were your principal and interest payments this year?