Every corner bank, financial institution and auto dealership will help you with and/or make available an auto loan calculator. Every respectable website that offers auto loans has an auto loan calculator as part of the site.
The auto loan calculator will check reality and determine your monthly costs with either financing or leasing a vehicle and will also give you the total vehicle price.
Prior to using the auto loan calculator, you will need the following:
$ Basic vehicle price
$ down payment
% sales tax
# of months (either financing or leasing)
annual % interest rate (APR).
If you are leasing, the auto loan calculator will ask for the residual value at the end of the auto lease agreement.
Double check the Auto loan calculator (it might be programmed to include an administration fee) and always verify figures including additions and subtractions to make sure you are not paying for mistakes and/or extra hidden costs. Make sure final results are what you were quoted. Also read the fine print. All of it and do not be pressured into signing an auto lease or financing agreement.
Shop and you will be amazed at the money you'll save.