Car Payment Calculator

Estimate your monthly car payment from the vehicle price, down payment, trade-in, sales tax, loan term, and APR. See total interest and the full cost of the loan.

Estimated Monthly Payment
over your loan term
Amount financed
Sales tax
Total interest paid
Total of payments
Total cost (incl. down + trade)

How Your Car Payment Is Calculated

Your monthly payment depends on the amount you finance, your interest rate, and your loan term. The amount financed is the vehicle price plus sales tax, minus your down payment and trade-in. That balance is then amortized over your term using the standard loan payment formula, so each payment covers interest plus a slice of principal.

Payment = Loan × r ÷ (1 − (1 + r)^−n)

How to Lower Your Car Payment

Four levers move your payment: a larger down payment, a lower price (negotiate or buy used), a better interest rate (shop your credit union and banks, not just the dealer), and a longer term. Be careful with long terms — stretching to 72 or 84 months lowers the monthly payment but sharply increases total interest and the risk of owing more than the car is worth.

How Much Car Can You Afford?

A common guideline is keeping total monthly car costs — payment plus insurance — under about 15% of your take-home pay, or following the 20/4/10 rule: 20% down, a term no longer than four years, and total vehicle costs under 10% of gross income. To work backward from a comfortable payment to a price, use our car affordability calculator.

Frequently Asked Questions

What is a car note?

A car note is your monthly auto loan payment — the fixed amount you pay each month until the loan is paid off. "Car note" and "car payment" mean the same thing.

How is my car payment calculated?

From the amount financed (vehicle price minus down payment and trade-in, plus sales tax and fees), your APR, and your loan term in months.

How much car payment can I afford?

A common guideline is keeping total car costs under about 15% of your take-home pay, or using the 20/4/10 rule. Enter a target payment in our affordability calculator to work back to a price.

How can I lower my monthly car payment?

Put more down, secure a lower APR, choose a less expensive car, or extend the term — though a longer term lowers the payment while raising total interest.

Is my payment based on the sticker price or the loan amount?

On the amount financed after your down payment and trade-in, plus taxes and fees — not the sticker price alone.

Where a $30,000 car loan goes
Example: $30,000 financed at 6% over 60 months. Interest is the extra you pay on top of the price.
$34,799total paidPrincipal — $30,000Interest — $4,799
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Written & reviewed by Chase Bennett, President of CalcHeadquarters
Every calculator is built from published formulas and authoritative sources, then independently checked for accuracy before it goes live. Last updated June 2026. Read our editorial policy & methodology.