Use this free auto loan calculator to estimate your monthly payment, total interest, and overall cost before you visit the dealership. Enter your loan amount, interest rate, and loan term above to see results instantly.
Whether you're financing a new or used car, this calculator helps you compare scenarios side by side. Adjust your down payment, trade-in value, or loan term to find a monthly car payment that fits your budget.
Auto Loan Calculator
The calculator at the top of this page estimates your monthly car loan payment based on the numbers you provide. Plug in the car price, your down payment, interest rate, and loan term. The tool returns your estimated monthly payment, total interest paid, and total cost of the loan.
This auto loan calculator works for new or used car loans from any lender. That includes banks, credit unions, and dealer financing. Results are estimates meant for planning, not a binding loan offer.
How the Car Loan Calculator Estimates Your Loan Payment
The calculator uses a standard formula that lenders apply to fixed-rate installment loans. Understanding the math helps you see exactly where your money goes each month.
Monthly Car Payment Formula
Your monthly payment is calculated with this formula:
M = P × [r(1 + r)^n] / [(1 + r)^n − 1]
- M = monthly payment
- P = loan principal (the amount you borrow after subtracting your down payment and trade-in)
- r = monthly interest rate (annual rate divided by 12)
- n = total number of monthly payments (loan term in months)
For example, a $25,000 loan at 6.5% APR for 60 months produces a monthly payment of roughly $489. The same loan stretched to 72 months drops to about $423, but you pay more interest over the life of the loan.
Auto Loan Interest and Amortization
Auto loan interest is the cost you pay a lender for borrowing money. It's expressed as an annual percentage rate (APR) and applied to your outstanding balance each month.
Early in the loan, a larger share of each payment covers interest. Over time, more of each payment goes toward the loan principal. This gradual shift is called amortization.
A shorter loan term means less total interest because the balance shrinks faster. A longer loan term lowers your monthly payment but increases the total amount of interest you pay over time.
Car Loan Payment Calculator Inputs
Getting an accurate estimate depends on the numbers you enter. Here's what each input means and where to find it.
Loan Amount, Interest Rate, and Loan Term
Loan amount is the total you need to finance. Start with the car price, then subtract your down payment and trade-in value. Add sales tax if your lender rolls it into the loan.
Interest rate is the APR your lender charges. If you haven't been pre-approved yet, use an estimate based on your credit score range. The calculator lets you test different rates to see how they affect your monthly payment.
Loan term is how long you have to repay the loan, measured in months. Common terms are 36, 48, 60, 72, and 84 months. A longer loan lowers monthly payments but raises total interest.
Down Payment, Trade-in, and Sales Tax
A down payment is cash you pay upfront to reduce the total loan amount. Even a small down payment lowers the amount you borrow and the interest you pay over time.
A trade-in works similarly. The dealer applies your current vehicle's trade-in value toward the purchase price of the new or used car. Trading in a vehicle can significantly reduce what you need to finance.
Sales tax varies by state and sometimes by county or city. Some states charge tax on the full purchase price. Others tax only the difference after your trade-in. Enter the rate for your location to get a more realistic estimate.
Credit Score and How It Affects Your Interest Rate
Your credit score is one of the biggest factors that determines the APR a lender will offer. Borrowers with excellent credit (typically 750 and above) qualify for the lowest auto loan interest rates. Lower scores usually mean a higher interest rate, which raises your monthly payment and total cost.
If you don't know your exact score, many banks and credit card issuers show it for free. Use it to choose a realistic rate when running the calculator. Even a difference of one or two percentage points changes your payment noticeably over a 60- or 72-month term.
Monthly Car Loan Payment Results
After you enter your inputs, the calculator displays several key numbers:
- Estimated monthly payment. The amount you'd pay each month for the life of the loan.
- Total interest paid. The total amount of interest you pay over the full loan term.
- Total cost of the loan. Your loan principal plus total interest, showing the overall cost of financing the car.
Use these results to compare different scenarios. Try adjusting the loan term, down payment, or interest rate to see how each change affects what you pay over time. This is a planning estimate, not a guaranteed offer from any lender.
Car Payment Calculator for New Car and Used Car Auto Loans
This calculator works for both new and used car loans. The math is the same. The difference is in the numbers you enter.
New cars often qualify for lower interest rates, especially through manufacturer promotional financing. Loan terms up to 72 or 84 months are common. The purchase price is usually higher, so a down payment matters more.
Used cars typically carry slightly higher interest rates because lenders see them as higher risk. Loan terms may be shorter, especially for older vehicles. The car price is lower, but factor in any added taxes and fees.
To compare, run the calculator once with new car numbers and once with used car numbers. Look at the total amount of interest, not just the monthly payment. A used car with a shorter term and slightly higher rate can still cost less overall than a new car financed over 84 months.
Auto Loan Interest Calculator and Amortization Schedule
Beyond your monthly payment, this tool shows how interest and principal split across each payment over the life of the loan.
An amortization schedule is a table listing every payment from first to last. Each row shows:
- The payment number
- How much goes to interest
- How much goes to the loan principal
- The remaining balance
In the early months, interest takes a bigger share. By the final payments, almost everything goes to principal. Reviewing the schedule helps you understand why paying extra toward principal early on can save a meaningful amount of interest.
This is also useful if you're thinking about refinancing your car loan partway through the term. You can see how much principal you still owe and estimate what a new loan would cost.
How Lenders Set Your Auto Loan Interest Rate
The rate you see in an ad isn't necessarily the rate you'll get. Lenders look at several factors to decide your specific APR.
Credit Union vs. Bank vs. Dealer Financing
Credit unions are nonprofit and often offer lower interest rates on auto loans than banks or dealerships. Membership is required, but many credit unions have broad eligibility.
Banks and online lenders set rates based on market conditions and your credit profile. Getting pre-approved with a bank gives you a baseline rate to compare.
Dealer financing is convenient because you handle the loan at the dealership. However, the dealer may mark up the rate from the original lender. Always compare the dealer's offer against a pre-approved rate from a bank or credit union.
Shopping at least two or three lenders before you finalize puts you in a stronger position. Multiple auto loan inquiries within a 14-day window typically count as a single hard pull on your credit report.
How Your Credit Score Shapes the Annual Percentage Rate
Your credit score is the single most influential variable in the rate you're offered. Here's a general idea of how score ranges map to auto loan rates (rates fluctuate with the market):
- 750+: Lowest available rates, often several points below average
- 700–749: Competitive rates, slightly above the best tier
- 650–699: Moderate rates, noticeably higher than prime
- Below 650: Higher interest rates that significantly increase total cost
A higher credit score saves you real money. On a $30,000 loan for 60 months, the difference between a 5% and 9% rate adds roughly $3,500 in total interest. If your score is borderline, even a small improvement before you apply for a loan can pay off.
Tips to Lower Your Monthly Car Payment
A few adjustments can meaningfully reduce what you pay each month and over the life of the loan.
Choosing the Right Loan Term
A longer loan (72 or 84 months) lowers your monthly payment but increases total interest. A shorter term (36 or 48 months) means higher monthly payments but far less interest paid overall.
The sweet spot for many buyers is 60 months. It balances a manageable monthly payment with a reasonable total cost. Use the calculator to compare terms side by side and see the tradeoff clearly.
Avoid stretching to 84 months just to afford a more expensive car. You risk owing more than the car is worth partway through the loan.
Using a Down Payment or Trade-in to Reduce the Loan Amount
Putting money down at purchase, whether cash or a trade-in, directly reduces your loan principal. A smaller loan means lower interest payments and a lower monthly payment.
A common guideline is 20% down on a new car and 10% on a used car. Even if you can't hit those numbers, any amount helps. Trading in a vehicle you already own is an easy way to lower the price of the car you're financing.
Refinancing Your Car Loan
If interest rates drop or your credit score improves after you buy, refinancing your car loan can lower your rate and monthly payment. You replace your current loan with a new one at better terms.
Refinancing works best when you're early in the loan term, since that's when interest charges are highest. Check with your current lender, a credit union, or an online lender to compare refinance offers.
Keep in mind that extending the loan term during a refinance may lower your payment but increase total interest. Aim for a lower rate without adding extra months when possible.
Auto Loans Payment Calculator Limitations
This calculator provides estimates for planning purposes. It is not a loan offer, approval, or guarantee from any lender.
A few things the tool does not account for:
- Fees. Title fees, registration fees, documentation fees, and other dealer charges vary and are not included.
- Vehicle insurance. Your monthly auto insurance cost is separate from your loan payment. The calculator does not estimate insurance.
- Gap insurance or extended warranties. Some buyers roll these into the loan. If you plan to, add those amounts to the car price manually.
- Variable rates. The calculator assumes a fixed interest rate for the full term.
- Exact tax rules. Sales tax calculations differ by state. The estimate here uses a flat percentage you enter.
For a precise loan quote, apply with a lender or credit union. Use these results as a starting point for comparison shopping, not as a final number.
Car Loan Calculator and Car Payment Calculator Questions
How Do I Calculate My Monthly Car Loan Payment?
Enter the loan amount, interest rate, and loan term into the calculator above. The tool applies the standard installment loan formula to estimate your monthly car loan payment. You can also calculate it manually: divide the annual interest rate by 12 to get the monthly rate, then plug it into the formula M = P × [r(1 + r)^n] / [(1 + r)^n − 1].
What Credit Score Do I Need for the Best Auto Loan Rates?
Borrowers with excellent credit, generally a score of 750 or higher, qualify for the lowest auto loan interest rates. A score between 700 and 749 still gets competitive rates. Below 650, expect a noticeably higher interest rate. Check your score before you shop so you can enter a realistic rate into the calculator.
Does the Payment Calculator Include Fees and Vehicle Insurance?
No. This auto loan calculator estimates your loan payment based on the loan amount, interest rate, and term. It does not include title fees, registration, dealer documentation fees, or vehicle insurance. Add those costs separately when budgeting for your car purchase.
How Does the Loan Term Affect Total Auto Loan Interest?
A longer loan term lowers your monthly payment but increases the total amount of interest you pay. For example, stretching from 60 to 84 months on a $25,000 loan at 7% adds thousands in interest over the life of the loan. Use the calculator to compare terms and see the exact difference.
Can I Use This Auto Loan Calculator for a Credit Union Loan?
Yes. The math works the same regardless of the lender. Enter the interest rate and terms your credit union offers, and the calculator will estimate your monthly payment. Credit unions often provide lower rates than banks or dealer financing, so it's worth running their numbers for comparison.
How Does a Rebate or Cash Down Affect My Car Payment?
A rebate or cash down payment reduces the amount you need to borrow. A smaller loan principal means lower monthly payments and less total interest paid. To account for a rebate, subtract it from the car price before entering your loan amount into the calculator. For a down payment, use the dedicated field in the tool.