Car Payment Calculator – Monthly Auto Loan Payment

Car Loan Payment Calculator

Auto Loan Payment Formula

Formula

PMT = \frac{P \times r}{1 - (1 + r)^{-n}}

Where:

$PMT$ — monthly auto loan payment
$P$ — principal loan amount (car cost minus down payment)
$r$ — monthly interest rate (annual rate divided by 12)
$n$ — total number of monthly payments (loan term in years × 12)

This is the standard annuity formula: it produces the fixed monthly payment that fully repays the principal plus interest over the loan term. If the interest rate is zero, the payment is simply $PMT = P / n$.

Auto Loan – Calculation Example

Example: you buy a car for $30,000, make a $5,000 down payment, and finance the rest over 5 years at a 5% annual interest rate with annuity payments.

\[P = 30000 - 5000 = 25000\]

\[r = \frac{5\%}{12} = 0.0041667, \quad n = 5 \times 12 = 60\]

\[PMT = \frac{25000 \times 0.0041667}{1 - (1 + 0.0041667)^{-60}} \approx 471.78\]

Result: the monthly payment is about $471.78. Over 60 payments the total comes to roughly $28,306.95, of which $3,306.95 is interest.

How to Use the Auto Loan Calculator

Enter the full Car cost — the vehicle's negotiated price, including any extras or fees you plan to finance.
Enter your Down payment — the cash amount you pay upfront. A larger down payment reduces the principal and the interest you pay.
Set the Loan term in years (1 to 10). Longer terms lower the monthly payment but raise total interest.
Enter the Interest rate — the annual percentage rate (APR) quoted by your lender, without the % sign.
Choose the Payment type: Annuity for a fixed monthly payment, or Classical for equal principal portions with declining interest each month.
Read the results: Monthly Payment, Total Payment (principal plus interest), and Total Interest — the true cost of borrowing.

What the Results Mean

The calculator answers the single most important question when financing a car: what will this vehicle really cost me? The Monthly Payment tells you whether the loan fits your budget, while the Total Interest shows how much extra you pay for borrowing. In the example above, a $25,000 loan costs about $3,307 in interest over five years — meaning the car effectively costs $28,307 plus your down payment.

The two payment types differ in how interest is distributed. With an annuity (the most common type of auto loan), every payment is identical, which makes budgeting simple. Interest is front-loaded: early payments are mostly interest, while later ones are mostly principal. With the classical (declining-balance) schedule, you repay an equal share of principal each month plus interest on the remaining balance, so payments start higher and gradually shrink. Because the balance falls faster on average, the classical method results in less total interest for the same rate and term.

Use the calculator to run scenarios before you visit a dealership. Compare a 3-year term against a 6-year term, or a 10% down payment against 20%. Watching how Total Interest changes is often more revealing than the monthly payment alone — a longer term can cut your payment by a third while nearly doubling the interest you pay.

Assumptions, Limitations and Practical Tips

The calculator assumes a fixed interest rate and payments made on schedule every month. Variable-rate loans will produce different results over time.
Taxes, registration fees, dealer fees, and insurance are not included unless you add them to the car cost yourself.
A trade-in works like a down payment: enter its value in the down payment field to see its effect on financing.
Lenders may charge an origination fee or prepayment penalty, which affect the true cost of the loan. Check whether extra payments are allowed without fees — paying slightly more than the required amount each month can shorten the loan and save substantial interest.
Keep total car costs (payment, insurance, fuel, maintenance) under roughly 15–20% of your monthly take-home pay to avoid overextending your budget.

To compare car financing with other types of borrowing, try our Loan Calculator, or use the Mortgage Payment Calculator for home loans, which uses the same annuity math. If you are weighing the purchase against investing the money instead, the Return on Investment Calculator can help you compare outcomes.

Frequently Asked Questions

What is a good interest rate on a car loan?

Auto loan rates vary with your credit score, loan term, and whether the car is new or used. As a rule of thumb, borrowers with excellent credit often qualify for rates around 4–6% APR on new cars, while average rates may run 7–10%, and subprime borrowers can be quoted 15% or more. Used-car rates are typically 1–3 percentage points higher. Always compare offers from banks, credit unions, and the dealership before signing — a difference of even 2% on a $25,000 loan can mean over $1,000 in extra interest.

How much down payment should I make on a car?

A common guideline is at least 20% of the car's price on a new vehicle and 10% on a used one. Besides lowering your monthly payment and total interest, a healthy down payment protects you from being "underwater" — owing more than the car is worth, since vehicles depreciate quickly in the first years. If you can't put much down, consider a shorter loan term or gap insurance to reduce the risk.

What is the difference between the interest rate and APR?

The interest rate is the pure cost of borrowing the principal. The APR (annual percentage rate) also folds in certain lender fees, expressed as a yearly rate, so it is usually slightly higher and reflects the loan's true cost more accurately. This calculator works best with the APR. When comparing loan offers, always compare APRs rather than nominal interest rates, because two lenders quoting the same rate may charge very different fees.

Is a longer or shorter loan term better?

There is a trade-off. A shorter term (3–4 years) means higher monthly payments but far less total interest and faster equity in the car. A longer term (6–7 years) lowers the payment but can cost thousands more in interest, and you risk owing more than the depreciating car is worth. Many advisors recommend keeping auto loans at 60 months or less and using the calculator to compare total interest between terms before deciding.

How do extra payments reduce my auto loan cost?

Any amount you pay above the required payment goes straight to the principal, which shrinks the balance that future interest is charged on. The effect compounds: each extra dollar eliminates all the interest that dollar would have accrued over the remaining term. For example, paying an extra $100 per month on a 5-year, $25,000 loan at 5% can pay it off roughly 10 months early and save around $700 in interest. Check first that your lender applies extras to principal and charges no prepayment penalty.

How is a classical (declining) payment schedule calculated by hand?

Divide the principal by the number of months to get the fixed principal portion: for a $25,000 loan over 60 months that is $25000 / 60 \approx 416.67$. Each month's payment equals this portion plus interest on the remaining balance: first month $25000 \times 0.0041667 \approx 104.17$, so the first payment is about $520.83. Recompute the interest each month on the shrinking balance — payments decline steadily until the final one is nearly the principal portion alone.

Does a 0% financing offer really cost nothing?

Genuine 0% APR loans charge no interest, so the total payment equals the principal — but read the fine print. These deals often apply only to shorter terms, require excellent credit, and may replace a cash rebate that would have been worth more than the interest saved. Compare both paths with the calculator: if the rebate exceeds the interest you'd pay on a standard-rate loan, taking the rebate and skipping the 0% offer is the better deal.

Car Payment Calculator – Auto Loan