Free auto loan tool
See your car payment, refinance savings, or real car budget in minutes.
Use one calculator to estimate your payment, compare loan options, refinance your current auto loan, or see whether old loan debt is getting rolled into your next deal.
Frequently asked questions
How we calculate this
Monthly payments use the standard installment-loan formula:m = P × r / (1 − (1 + r)^−n)where P is the amount financed, r is the monthly rate (APR ÷ 12 ÷ 100), and n is the number of months.
Refinance comparisons take your current monthly payment × months remaining as the cost of staying with the current loan, then compare it to the new loan's full cost including refinance fees and any cash-out. Break-even is fees ÷ monthly savings.
Negative equity (you owe more than your car is worth) is rolled into the new loan's financed amount. The "extra interest" figure is the difference between interest on the new loan with vs. without that rolled debt.
Affordability solves the payment formula backward to find the highest principal your target payment supports, then accounts for tax, fees, down payment, and trade-in to back into a car price. The safer budget uses about 85% of your target.
Assumptions & limits
- Rates are estimates unless you enter exact numbers.
- Taxes and fees vary by state and dealer.
- Final lender approval may change APR or terms.
- Vehicle value estimates and trade-in outcomes may vary.
- Negative equity may affect refinance eligibility.
This calculator is for educational estimates only. Actual rates, lender terms, taxes, fees, and dealer offers may differ.