Car dealers love talking monthly payment, because a longer term can make almost any price "fit" your budget while quietly adding thousands in interest. This auto loan calculator flips the conversation around: enter the vehicle price, down payment, trade-in value, interest rate and term, and it shows the real monthly payment, the total interest you will pay, and the true cost of the car including everything. Run the same car at 36, 48, 60 and 72 months side by side and the trade-off becomes obvious — the longer the term, the smaller the payment and the bigger the interest bill. Use it before you visit the dealer, not after, so you negotiate the price and the financing as two separate decisions.
How the payment is figured
Auto loans amortize exactly like mortgages: a fixed payment where early installments are mostly interest. The amount financed is price minus down payment minus trade-in, plus taxes and fees if you roll them in.
Example
$32,000 car, $4,000 down, 6.9% APR, 60 months. Amount financed: $28,000. Monthly payment about $554, total interest roughly $5,240. Stretch to 72 months and the payment drops to $476 — but interest climbs to about $6,270.
Trade-in and down payment
A bigger down payment or trade-in shrinks the amount financed, which cuts both the payment and the interest. It also protects you from going underwater (owing more than the car is worth), which happens fast on long loans because cars depreciate quickest in the first two years.
Frequently asked questions
What is a good APR for a car loan?
It depends on credit: excellent credit can see 5–7% on new cars in typical markets, while weaker credit pays much more. Always compare the dealer's offer with a bank or credit union quote.
Is a 72-month car loan bad?
Often. The payment is lower but you pay more interest and stay underwater longer. If you need 72+ months to afford the payment, the car is probably too expensive.
Should I put money down on a car?
Yes if you can — 10–20% down reduces interest and keeps you from owing more than the car's value. A trade-in works the same way.
How is auto loan interest calculated?
Most auto loans use simple interest on the remaining balance each month, amortized into equal payments — the same formula as a mortgage.