The Car Loan Calculator can be used to calculate the loan amount on new or used car. You can also try the "How Much Car Can I Afford" calculator using your vehicle financing information to see the total price you can pay for a car. Enter your purchase price, interest rate, and loan length to determine your monthly car loan payment. To calculate how much car you can afford enter your desired monthly vehicle payment, anticipated interest rate and loan length. Down payment and trade in value are optional for both calculators. When You are Done: Find Your New Caror Apply for a Car Loan