If you're in the market for a new car, the choices can be a bit overwhelming. Selecting from all your financing options can be a challenge, too. Before visiting a showroom, it may help to have a ballpark figure of how much you can afford to spend.

First, choose a range for the loan amount, say $14,000 to $15,000. Enter those figures in the first two boxes. In the next box, "increments," specify how detailed you want the calculations to be. For example, if you enter 100, it will give you the calculations for $14,000, $14,100, $14,200, etc. Next enter an interest rate, and click on "calculate." A table will pop up showing the monthly payment for each amount for a term of 24, 36, 48 and 60 months.