Auto Loan Calculator — Estimate Your Monthly Payment & Total Cost
Enter your numbers below to see your estimated monthly payment, total interest, and total cost. Adjust the sliders to compare different scenarios — see how rate, term, and down payment change the math.
Enter Your Loan Details
Your Estimated Payment
Compare Loan Scenarios
Same car, different terms — see how the numbers change.
36-Month Loan
$30,000 at 5.5% APR
- Payment: $906/mo
- Total Interest: $2,620
- Total Cost: $32,620
Highest payment, lowest total cost. Best if you can afford it.
60-Month Loan
$30,000 at 6.0% APR
- Payment: $580/mo
- Total Interest: $4,800
- Total Cost: $34,800
Best balance of payment and cost. Most popular choice.
84-Month Loan
$30,000 at 7.0% APR
- Payment: $466/mo
- Total Interest: $9,118
- Total Cost: $39,118
Lowest payment — but $6,498 more in interest vs 36-month.
The 20/4/10 Rule — How Much Car Can You Afford?
The most widely recommended car-buying affordability guideline.
Example: Earning $6,000/month gross → max $600/month total vehicle cost → approximately $450/month payment (leaving $150 for insurance and fuel) → with 20% down, that supports a ~$25,000 car on a 48-month loan at 6%.
How Interest Rate Affects Your Total Cost
On a $30,000 loan over 60 months — see why rate shopping matters.
The difference between 3% and 10%: $98/month more and $5,877 more in total interest. Pre-approval and rate shopping are worth the 15 minutes they take.
Get Pre-Approved →Quick Financing Tips
Apply these before you sign anything.
Get Pre-Approved First
Lock in a rate from your bank or credit union before visiting the dealer. Use it as leverage — if the dealer can’t beat it, you already have your financing secured.
Pre-Approval Sources →Negotiate Price, Not Payment
Dealers love to focus on monthly payment — then stretch the term to hit your number. Negotiate the total vehicle price first. Then calculate the payment yourself using this calculator.
Negotiation Guide →Improve Your Score First
Even a 30–50 point improvement can drop your rate by 1–2%, saving thousands. Pay down credit cards, dispute errors, and avoid opening new accounts before applying.
Credit Score Guide →Key Numbers to Know
How to Use This Auto Loan Calculator to Make a Smarter Purchase
A car payment is one of the largest recurring expenses in most people’s budgets — yet many buyers commit to a loan without fully understanding what they’re agreeing to. The monthly payment is just one number. What matters equally is how much of that payment goes to interest versus principal, how much you’ll pay in total over the life of the loan, and whether you’ll maintain positive equity in the vehicle throughout the term.
This calculator is designed to make those hidden numbers visible. By adjusting the sliders for vehicle price, down payment, trade-in value, interest rate, and loan term, you can see in real time how each variable affects your monthly payment and total cost. The payment breakdown bar shows the split between principal and interest — a useful visual reminder that longer terms and higher rates mean a greater share of every payment goes to the lender rather than toward owning your car.
The most powerful use of this tool is scenario comparison. Try the same car at 60 months versus 84 months and watch the total interest nearly double. Try increasing your down payment by $3,000 and see the monthly savings. Try the difference between a 5% rate (pre-approved at a credit union) and an 8% rate (dealer markup) on the same loan — the gap in total cost is often $2,000 to $4,000. These comparisons take seconds with the calculator but represent thousands of dollars in real-world impact.
Before you visit a single dealership, run your numbers here. Know what you can afford, what loan term makes sense, and what rate you should be targeting. Then get pre-approved and shop for your car with the confidence that comes from understanding exactly what the financing will cost. The buyers who save the most are the ones who do the math first.
Frequently Asked Questions
How is a car payment calculated?
Your monthly payment is based on three factors: the loan amount (vehicle price minus down payment and trade-in), the interest rate (APR), and the loan term in months. The formula uses compound interest so each payment covers both principal and interest. Use the calculator above to see your exact numbers.
What is a good monthly car payment?
Financial experts recommend spending no more than 10–15% of your monthly take-home pay on a car payment. For someone earning $5,000/month after taxes, that means a payment between $500 and $750. The 20/4/10 rule provides a more comprehensive framework.
How much car can I afford?
Use the 20/4/10 rule: 20% down, 4-year (48-month) maximum term, and total vehicle costs (payment + insurance + fuel) under 10% of gross income. This is conservative but financially sound. Use the calculator to test scenarios that fit your budget.
Does a larger down payment make a big difference?
Yes. On a $35,000 car at 6% over 60 months, a 20% down payment ($7,000) saves ~$1,120 in interest vs $0 down. It also lowers your monthly payment by ~$135 and protects you from negative equity. Your trade-in can serve as part or all of your down payment.
Should I choose a shorter or longer loan term?
Shorter is almost always better financially. Going from 72 to 60 months on a $30K loan at 6% saves ~$1,800 in total interest for about $115/month more. Never stretch the term just to afford a more expensive car — choose a less expensive car with a shorter term instead.
How much interest will I pay total?
It depends on your loan amount, rate, and term. On a $30,000 loan at 6% for 60 months: ~$4,800. Same loan at 8%: ~$6,500. Same loan at 6% for 84 months: ~$6,900. Use the calculator to see exact numbers for your scenario — and see why both rate and term matter so much.
Related Guides
Car Financing
Complete financing guide & pre-approval
Credit Score Guide
What score you need and how to improve
Negotiation Guide
Negotiate price, not payment
Refinance Guide
Lower your rate after purchase
Lease vs Buy
Which makes more financial sense?
Dealer Fees
Every fee explained
Trade-In Value
Use your trade-in as down payment
Find Your Next Car
Compare deals from 6 platforms
Know Your Payment — Now Find Your Car
Get pre-approved at the best rate, then shop with confidence. Informed buyers save thousands.
100% Free • No Account Needed • Compare Lenders • Save $2K–$5K+
