Auto Loan Calculator

What is a car loan?

A car loan is an installment loan secured by the vehicle you purchase, repaid in fixed monthly payments of principal plus interest over a set term — usually 36 to 84 months — until the car is fully yours.

How this calculator works

• Enter the vehicle price, down payment, trade-in value, sales tax rate, title/reg fees, APR, and loan term.
• The monthly figure comes from the standard amortization formula — the same one lenders use to quote payments.
• The amortization schedule shows how each payment splits between interest and principal, month by month.
• Add extra payments to see total interest, payoff date, and early payment savings instantly.
• Taxes and fees roll into the amount financed unless you mark them as paid out of pocket at signing — uncheck the box to compare both scenarios.

How to use the result

1. Keep total car costs — payment, insurance, fuel, maintenance — under 15% of your monthly take-home pay. If the result is $480 and you take home $4,000, you’re right at that ceiling.
2. Check the total interest. Paying $6,500 in interest on a $25,000 loan is a signal to try a shorter term or a larger down payment.
3. Test extra payments. An additional $50 a month on a 60-month loan typically shaves 4–6 months off the payoff date and saves several hundred dollars.
4. If the number strains your budget, increase the down payment before accepting a longer term — it’s usually the cheaper fix.
5. Bring the payment and term to at least two lenders. Credit unions frequently beat dealer-arranged APRs by half a point or more.

How does a car loan calculator work?

It takes three core inputs — amount financed, APR, and term — and applies the amortization formula to produce your monthly payment and total interest. Because the math is identical to what lenders use, you can compare different down payments, terms, and rates side by side before talking to a dealer.

Common mistakes

• Negotiating the monthly payment instead of the total price. A dealer can hit your target by stretching the term while the car costs more overall.
• Forgetting sales tax, title, registration, and doc fees. In most states these add 7–10% to the amount financed — check your local sales tax rate before assuming a number.
• Defaulting to the longest term. An 84-month loan looks cheap per month but costs far more in interest and keeps you upside-down longer.
• Letting extra payments apply to next month’s bill instead of principal. Unless you specify principal-only, the payoff date barely moves.

If you’re still deciding between financing and leasing, run the same vehicle through a lease-vs-buy comparison before you commit — the break-even point surprises most first-time buyers. For a parallel look at how recurring payments fit your monthly budget, the invoice generator shows what a steady client billing cadence looks like in dollar terms.