Auto Loan Calculator: Monthly Payment, Interest & Loan Terms
Quick Answer: How to Calculate Your Car Payment
Your monthly car payment is calculated using the standard loan amortization formula. For a $30,000 loan at 7% APR over 60 months, the monthly payment is $594. Total interest paid over the life of the loan is $5,640. A shorter term (48 months) raises the payment to $718 but cuts total interest to $4,464.
- *The average new-car loan in Q4 2024 was $40,927 at 6.61% APR, per Experian.
- *Credit score has more impact on your rate than nearly any other factor — a 200-point difference can mean 10+ percentage points of APR.
- *Longer loan terms (72–84 months) lower payments but dramatically increase total interest and depreciation risk.
The Auto Loan Payment Formula
Every car payment is calculated using the same amortization formula your lender uses. Understanding it puts you in control at the dealership.
M = P × [r(1+r)^n] / [(1+r)^n − 1]
Where:
- M = monthly payment
- P = principal (loan amount after down payment)
- r = monthly interest rate (annual APR ÷ 12)
- n = total number of monthly payments (loan term in months)
Example: You finance $30,000 at 7% APR for 60 months.
- r = 0.07 ÷ 12 = 0.005833
- n = 60
- M = $30,000 × [0.005833 × (1.005833)^60] / [(1.005833)^60 − 1]
- M = $594.04 per month
Total paid over 60 months: $35,642. Total interest: $5,642. You do not need to crunch these numbers by hand — our auto loan calculator handles it instantly.
Average Auto Loan Rates by Credit Score Tier (2025)
According to Experian's State of the Automotive Finance Market Q4 2024, here are average APRs by credit tier for new and used vehicles:
| Credit Tier | Score Range | New Car APR | Used Car APR |
|---|---|---|---|
| Super Prime | 781–850 | 5.25% | 7.13% |
| Prime | 661–780 | 6.87% | 9.36% |
| Nonprime | 601–660 | 9.83% | 13.92% |
| Subprime | 501–600 | 13.18% | 18.86% |
| Deep Subprime | 300–500 | 15.77% | 21.55% |
The gap between super-prime and deep subprime borrowers on a new-car loan is over 10 percentage points. On a $35,000 loan over 60 months, that difference costs more than $13,000 in extra interest. If your credit score is below 660, improving it before buying could save you thousands.
Loan Term Comparison: 36 to 84 Months
The loan term is the single biggest lever on your monthly payment after price and rate. Shorter terms almost always save you money overall. Here's a comparison on a $35,000 loan at 7% APR:
| Loan Term | Monthly Payment | Total Interest Paid | Total Cost |
|---|---|---|---|
| 36 months | $1,081 | $3,905 | $38,905 |
| 48 months | $838 | $5,215 | $40,215 |
| 60 months | $693 | $6,601 | $41,601 |
| 72 months | $595 | $7,980 | $42,980 |
| 84 months | $526 | $9,397 | $44,397 |
Going from 36 to 84 months cuts your monthly payment by $555 but costs an extra $5,492 in interest. According to Edmunds, 84-month loans accounted for nearly 17% of all financed vehicles in late 2024 — a record high. That's a problem, because most vehicles depreciate faster than a long-term loan pays down.
The Underwater Car Problem
Cox Automotive estimates that over 23% of trade-ins in 2024 had negative equity — meaning the owner owed more than the car was worth. This is almost always the result of long loan terms combined with rapid depreciation. A new car loses roughly 20% of its value in the first year, per Carfax depreciation data. A 72- or 84-month loan often does not pay down principal fast enough to keep up.
If you're upside-down and need to sell or trade in, you'll have to make up the difference out of pocket or roll the negative equity into your next loan — which makes the problem worse.
5 Ways to Get a Lower Car Payment
1. Improve Your Credit Score Before Applying
Even moving from nonprime (601–660) to prime (661+) can drop your rate by 3 percentage points or more. Pay down revolving balances, dispute errors, and avoid new credit inquiries for at least 90 days before applying. According to the Federal Reserve's 2024 Consumer Credit Report, each tier jump in credit score can save borrowers $1,500–$4,000 in auto loan interest over the life of a typical loan.
2. Make a Larger Down Payment
A bigger down payment reduces the loan principal directly. Edmunds recommends 10–20% down on a new car and at least 10% on used. On a $40,000 car, putting down $8,000 (20%) instead of $2,000 (5%) saves roughly $2,200 in interest on a 60-month loan at 7% — and keeps you from going underwater faster.
3. Choose a Shorter Loan Term
Yes, shorter terms mean higher monthly payments. But if you can afford it, a 48-month loan vs a 72-month loan on the same car saves thousands in interest. Think of it as paying yourself: money not spent on interest stays in your pocket.
4. Shop Multiple Lenders (Not Just the Dealer)
Dealer financing is convenient but rarely the cheapest option. Credit unions consistently offer lower rates than banks or captive finance arms. The National Credit Union Administrationreports that credit unions averaged 1.5–2.0 percentage points lower on auto loans versus commercial banks in 2024. Get pre-approved before setting foot in a dealership — it gives you a rate benchmark and strengthens your negotiating position.
5. Buy a Less Expensive Vehicle
The simplest lever. A rule of thumb from financial planners: keep total vehicle costs (payment + insurance + maintenance) under 15% of your take-home pay. Use our auto loan calculator to back-calculate what car price fits your budget, then shop within that ceiling. Our loan calculator can help you model any debt scenario.
New Car vs Used Car Financing
Used cars almost always carry higher interest rates than new cars, even though they cost less. That sounds counterintuitive, but it reflects higher lender risk on older collateral. According to Experian Q4 2024, the average used-car loan rate was 11.74% versus 6.61% for new cars.
On a $20,000 used car at 11.74% for 60 months, your monthly payment is $441 and total interest is $6,450. The same $20,000 at 6.61% (new-car rate) costs $393/month and $3,580 in interest. So the “cheaper” used car can cost you more in financing. Run the numbers both ways before deciding.
How Refinancing Can Save You Money
If you took out a loan when your credit was weak, or if rates have fallen since you financed, refinancing is worth exploring. Cox Automotive data shows that borrowers who refinance within 12–18 months of their original loan save an average of $65/month. Over the remaining loan term, that adds up fast.
Refinancing makes the most sense when:
- Your credit score has improved by 50+ points since you got the original loan
- Market interest rates have dropped significantly
- You got high-rate dealer financing and did not shop around at the time
- You have at least 12 months remaining on the loan
Be cautious about extending your term when you refinance. A lower rate is great; a lower rate with a longer term can still cost you more total interest. For more on managing debt, see our debt payoff guide and the amortization explained guide.
Total Cost of Car Ownership Beyond the Loan
Your loan payment is just one piece of the cost. AAA's 2024 Your Driving Costs report puts the average annual cost of owning a new vehicle at $12,182— about $1,015 per month. That includes:
- Depreciation: ~$4,200/year (the largest cost)
- Insurance: ~$1,900/year
- Fuel: ~$1,500/year
- Maintenance & tires: ~$1,400/year
- Finance charges: ~$1,000/year
When evaluating whether you can afford a car, include all of these — not just the monthly payment. Use our interest calculator or our mortgage calculator guide for related borrowing scenarios.
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Frequently Asked Questions
How do I calculate my monthly car payment?
Use the formula M = P[r(1+r)^n] / [(1+r)^n − 1], where P is the loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the number of monthly payments. A $30,000 loan at 7% for 60 months produces a monthly payment of about $594.
What is a good interest rate for a car loan in 2025?
According to Experian Q4 2024 data, borrowers with super-prime credit (781+) averaged 5.25% on new-car loans. Prime borrowers (661–780) averaged 6.87%. Anything below the average for your credit tier is a good rate. Compare at least three lenders before signing.
Is a 72-month car loan a bad idea?
A 72-month loan lowers your monthly payment but adds significantly more interest. A $35,000 loan at 7% costs $3,956 in interest over 48 months but $7,980 over 72 months — more than double. You are also more likely to be underwater (owe more than the car is worth) for longer.
How much does credit score affect car loan rates?
The spread is significant. According to Experian Q4 2024, deep subprime borrowers (300–500) paid an average of 15.77% on new cars versus 5.25% for super-prime borrowers. On a $30,000 loan over 60 months, that difference costs over $13,000 in additional interest.
Should I put more money down on a car loan?
Yes, a larger down payment reduces both your monthly payment and total interest paid. It also builds equity faster, reducing the risk of going underwater. Edmunds recommends 10–20% down on a new car. Putting down 20% on a $35,000 car saves roughly $1,400 in interest over a 60-month loan.
Can I refinance my auto loan to get a lower rate?
Yes. Refinancing makes sense if your credit score has improved, rates have dropped, or you got a high-rate dealer loan. According to Cox Automotive, nearly 1 in 5 borrowers who refinance within the first year save at least $50 per month. Shop credit unions and online lenders for the best refi rates.