Auto Calculators

Using the amortization formula M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the amount financed, r is the monthly interest rate (APR ÷ 12), and n is the number of monthly payments (term in months). At 0% APR, the payment is simply P ÷ n.

A longer term lowers each monthly payment but increases the total interest you pay over the life of the loan, because you borrow the same principal for more months at the same rate.

Affordability depends on your monthly transportation budget minus recurring costs like insurance, fuel, maintenance, and registration. The Car Affordability Calculator subtracts those costs first, then solves for the loan principal — and therefore the vehicle price — that the remaining payment supports.

Leasing typically has lower monthly payments but no ownership equity at the end. Buying costs more per month but builds equity. The right choice depends on how long you keep a vehicle, your mileage, and whether you value ownership. Our Lease vs. Buy Calculator compares the estimated costs.

Refinancing can make sense if interest rates have fallen, your credit has improved, or you need a lower monthly payment. It may reduce your rate or payment but could extend the term and raise total interest. The Auto Refinance Calculator compares your current loan against a new one.

Depreciation is the loss in a vehicle's value over time. It affects resale and trade-in value and is often the single largest ownership cost. The Vehicle Depreciation Calculator projects value over time using annual depreciation assumptions.