Vehicle & Loan Details
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Negotiated out-the-door price
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Cash down (leave 0 if none)
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Net equity (value minus owed)
%
Your state’s tax rate (0 for AK/DE/MT/NH/OR)
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Doc fee + registration + other
%
Your loan APR
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Shorter = less interest. Longer = lower monthly payment.
Find the car price you can afford from a target payment
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Maximum comfortable monthly payment
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Expected loan APR
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Loan length
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Cash + trade-in equity
Compare monthly payment and total cost across loan terms
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Amount financed (after down payment & trade)
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Your loan APR
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Monthly Payment
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⚠️ Disclaimer: This calculator uses standard amortization formulas for illustration only. Actual loan terms, APR, and eligibility are determined by your lender based on credit score, income, and vehicle. Always confirm terms directly with your lender before signing.
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Sources & Methodology
Payment formula from standard financial mathematics. APR benchmarks from Experian Q4 2025 State of the Automotive Finance Market report. All external sources have nofollow links.
Experian — State of the Automotive Finance Market Q4 2025
Experian Q4 2025 auto finance report providing average APR by credit score tier for new and used car loans. Data used for the APR reference table in the content section. Covers 500+ million consumer credit files for the most comprehensive US auto loan rate data available.
Federal Reserve — G.19 Consumer Credit Report
Federal Reserve G.19 release providing monthly data on consumer credit including auto loan outstanding balances and average new car loan terms. Used to validate average loan term data (68.5 months average in late 2025) and total auto loan debt figures cited in this page.
Methodology:
Monthly Payment = P x [r(1+r)^n] / [(1+r)^n - 1]
Where: P = loan principal | r = APR/12/100 (monthly rate) | n = term in months
Loan principal = (Vehicle price - down payment - trade-in equity) x (1 + tax rate/100) + fees
Reverse (affordability): P = Payment x [(1+r)^n - 1] / [r(1+r)^n]
Each month: Interest paid = Balance x r | Principal paid = Payment - Interest | New balance = Balance - Principal paid
Amortization schedule computed iteratively month by month. Total interest = sum of all monthly interest charges. Standard compound interest formula per CFPB Truth in Lending Act disclosure requirements.
Auto Loan Calculator Guide — Car Payment, Total Cost & Smart Financing
The monthly car payment is the most visible number in any auto purchase — but it's only part of the story. Two identical $500/month payments can cost $3,000 to $5,000 more or less in total depending on the loan term and APR. Understanding how auto loan amortization works, how your credit score affects your rate, and how to use a trade-in strategically can save significant money on one of the largest purchases most people make.
Monthly Payment = P x [r(1+r)^n] / [(1+r)^n - 1]
Example — $28,000 financed, 6.5% APR, 60 months:
r = 6.5 / 12 / 100 = 0.005417 (monthly rate)
Payment = 28,000 x [0.005417 x (1.005417)^60] / [(1.005417)^60 - 1]
Payment = 28,000 x [0.005417 x 1.3840] / [1.3840 - 1]
Payment = 28,000 x 0.007496 / 0.3840 = 28,000 x 0.01952 = $547/month
Total paid = $547 x 60 = $32,819 | Total interest = $32,819 - $28,000 = $4,819
r = 6.5 / 12 / 100 = 0.005417 (monthly rate)
Payment = 28,000 x [0.005417 x (1.005417)^60] / [(1.005417)^60 - 1]
Payment = 28,000 x [0.005417 x 1.3840] / [1.3840 - 1]
Payment = 28,000 x 0.007496 / 0.3840 = 28,000 x 0.01952 = $547/month
Total paid = $547 x 60 = $32,819 | Total interest = $32,819 - $28,000 = $4,819
APR by Credit Score — What Rate Should You Expect?
Your credit score is the single biggest factor determining your auto loan APR. According to Experian’s Q4 2025 data, there is a 10+ percentage point spread between super prime and deep subprime rates — meaning the same $30,000 car loan can cost $5,000 to $8,000 more in total interest depending on your credit tier.
| Credit Score | Credit Tier | Avg New Car APR | Avg Used Car APR | Total Interest on $25K/60mo |
|---|---|---|---|---|
| 781–850 | Super Prime | 5.38% | 7.11% | $3,611 |
| 661–780 | Prime | 7.42% | 9.61% | $5,027 |
| 601–660 | Non-Prime | 10.73% | 13.47% | $7,338 |
| 501–600 | Subprime | 13.97% | 18.48% | $9,648 |
| Below 500 | Deep Subprime | 15.77% | 21.32% | $10,963 |
Source: Experian State of the Automotive Finance Market Q4 2025. Total interest calculated at $25,000 loan, 60-month term.
Loan Term Comparison — 48 vs 60 vs 72 Months
Longer loan terms reduce monthly payments but significantly increase total interest paid. The 84-month (7-year) auto loan has become common in recent years, but it creates a serious underwater-equity risk: cars depreciate fastest in years 1 through 3, and an 84-month loan barely reduces principal during that period. Below is the true cost comparison for a $30,000 loan at 6.5% APR.
| Loan Term | Monthly Payment | Total Interest | Total Paid | Interest Saved vs 84mo |
|---|---|---|---|---|
| 36 months | $919/mo | $1,103 | $33,103 | +$8,265 saved |
| 48 months | $714/mo | $2,271 | $34,271 | +$7,097 saved |
| 60 months | $587/mo | $5,208 | $35,208 | +$4,160 saved |
| 72 months | $505/mo | $6,356 | $36,356 | +$3,012 saved |
| 84 months | $449/mo | $9,368 | $39,368 | — |
The 20/4/10 Rule — How Much Car Can You Afford?
Financial advisors recommend the 20/4/10 rule for car purchases: 20 percent down payment, loan term no longer than 4 years (48 months), and total monthly vehicle expenses (payment + insurance) under 10 percent of gross monthly income. A stricter modern guideline: keep the car payment alone under 15 percent of take-home pay. If your take-home pay is $4,500/month, your maximum comfortable car payment is $675. At 6.5% APR over 60 months, $675/month supports approximately $58,000 in loan amount before tax and fees.
💡 Always get pre-approved before visiting a dealership. A pre-approval from your bank or credit union gives you the exact APR and maximum loan amount you qualify for, before you walk in. This prevents the dealer from structuring the conversation around monthly payments rather than vehicle price, and gives you a rate benchmark to compare against dealer financing. Credit unions consistently offer rates 0.5 to 1.5 percentage points lower than banks for equivalent borrowers — always check your credit union first.
Frequently Asked Questions
Formula: M = P x [r(1+r)^n] / [(1+r)^n - 1]. P = loan amount, r = APR/12/100, n = months. Example: $25,000, 6.5% APR, 60 months: r = 0.005417. M = 25,000 x [0.005417 x 1.3840] / [0.3840] = $488.56/month. Total interest = ($488.56 x 60) - $25,000 = $4,314. Use Mode 1 above for instant calculation including sales tax, fees, and full amortization schedule.
Experian Q4 2025 averages: Super prime (781+): 5.38% new, 7.11% used. Prime (661-780): 7.42% new, 9.61% used. Non-prime (601-660): 10.73% new. Subprime (501-600): 13.97% new. Credit unions typically offer 0.5 to 1.5 points below banks. Manufacturer-sponsored 0% APR deals are the best available — these are subsidized promotions. Any rate under 6% for new cars in the current market (2025-2026) is considered good.
20/4/10 rule: 20% down, maximum 48-month term, total car expenses under 10% of gross monthly income. Stricter rule: payment under 15% of take-home pay. Example: $5,000/month take-home = $750 max payment. At 6.5% APR, 60 months, $750/month = approximately $63,000 loan capacity. Use Mode 2 (How Much Can I Afford?) above to enter your target payment and get the exact supportable vehicle price.
48 months: higher payment but $3,000 to $5,000 less total interest on most loans. 60 months: lower payment, more manageable monthly cash flow but costs more total. 72 to 84 months: avoid if possible — you pay thousands more in interest and stay underwater on equity for years. On a $30,000 loan at 6.5% APR: 48-month saves $2,937 in interest vs 60-month, but costs $127 more per month. Use Mode 3 (Compare Loan Terms) to see the exact comparison for your loan amount.
Trade-in net equity (value minus remaining loan) reduces the financed amount dollar-for-dollar. Example: $28,000 new car, trade worth $8,000 with $3,000 owed = $5,000 net equity. Amount financed = $28,000 - $5,000 - down payment. In most states, trade-in also reduces the taxable amount: at 8% sales tax, a $5,000 trade saves $400 in tax. Enter your trade-in value in Mode 1 for the full calculation.
For car loans, APR includes the interest rate plus any lender fees. Some lenders quote just the interest rate — always ask for the APR for accurate cost comparison. Dealer financing often includes a markup above what the captive lender approves (the "buy rate") — the dealer earns the spread. Example: lender approves at 4%, dealer charges you 6% — they keep 2%. Always compare APR, not just the monthly payment or stated rate.
Credit unions offer the lowest rates on average — 0.5 to 1.5 points below dealer financing. Get pre-approved before visiting the dealer, then compare against what the dealer offers. Exception: manufacturer-sponsored 0% or very low rate deals (e.g., 1.9%) are genuinely better than any bank rate. For non-promotional financing, direct lending from a credit union or bank almost always beats dealer financing for the same credit tier buyer.
Credit score directly controls APR. On a $30,000 60-month loan, the difference between super prime (5.38%) and subprime (13.97%) is approximately $5,937 in total interest. If your score is below 660, improving it even 50 to 60 points before applying can move you from non-prime to prime and save $2,000 to $4,000 in total interest. Check your credit report for errors before applying — dispute any inaccurate negative items that are reducing your score.
Common fees: Sales tax (0% in AK/DE/MT/NH/OR, up to 7%+ in most states). Doc fee ($0 to $900 depending on state). DMV registration and title ($50 to $700). Dealer add-ons (warranty, paint protection, GAP insurance — negotiable). These fees add $1,500 to $3,500 to most purchases. Always ask for the out-the-door price — the total including all taxes and fees — not just the vehicle sale price, before evaluating any financing offer.
GAP insurance pays the difference between what you owe and the car's actual value if it's totaled. Most important when: down payment was under 20%, loan term is 60+ months, you rolled negative equity from a previous trade, or vehicle depreciates quickly. Buy GAP from your auto insurer (typically $20 to $40/year added to your policy) NOT from the dealer (who charges $400 to $900 for the same product). Skip GAP if you put 20%+ down with a 48-month loan — you likely won't be significantly underwater.
Total interest = (Monthly payment x number of months) - Principal borrowed. Example: $488.56/month x 60 months = $29,313.60 total paid. $29,313.60 - $25,000 principal = $4,313.60 total interest. The full amortization schedule (visible in Mode 1 results) shows exactly how much principal and interest is paid in each month throughout the life of the loan.
An amortization schedule shows, month by month, how each payment is divided between interest and principal repayment, and the remaining loan balance after each payment. Early payments are mostly interest — later payments are mostly principal. Example: Month 1 on a $25,000 6.5% APR 60-month loan: Payment $488.56. Interest = $25,000 x 0.005417 = $135.42. Principal = $488.56 - $135.42 = $353.14. New balance = $24,646.86. Mode 1 above shows the complete amortization schedule for your loan.
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