Auto Loan Calculator 2023 Free auto loan calculator to determine the monthly payment and total cost of an auto loan, while accounting for sales tax, fees, trade-in value, and more. Auto Price: Loan Term (months): Interest Rate (%): Cash Incentives: Down Payment: Trade-in Value: Amount Owed on Trade-in: Your State: — Select — Alabama Alaska Sales Tax (%): Title, Registration, and Other Fees: