Auto Loan Calculator — Monthly Car Payment
Calculate your monthly car loan payment with down payment, trade-in, sales tax, and fees. Includes a full amortization schedule, rate sensitivity table, down payment impact analysis, and side-by-side loan comparison.
Quick Presets
Credit Score Tier (sets suggested rate)
≈ 16.67%
What Is the Auto Loan Calculator — Monthly Car Payment?
This calculator computes the complete cost picture for any auto loan. Beyond the basic monthly payment, it reveals how interest rate changes, down payment size, and loan term each affect the total amount you pay. The side-by-side comparison feature lets you evaluate competing loan offers on equal footing.
- ›True loan principal — includes sales tax and dealer/doc fees in the financed amount, matching what you actually borrow.
- ›Rate sensitivity table — shows your monthly payment and total interest at ±0.5% and ±1% from your entered rate, so a small credit score improvement translates directly to dollars.
- ›Down payment impact analysis — reveals how 0%, 5%, 10%, 15%, and 20% down affect interest cost, motivating higher down payments.
- ›LTV ratio — Loan-to-Value ratio flags whether gap insurance may be required and how much equity you start with.
- ›Side-by-side loan comparison — enter an alternative offer's rate and term to see exactly which deal costs less over its full life.
- ›Full amortization schedule — month-by-month breakdown showing how much of each payment goes to interest vs principal as the loan matures.
Formula
Monthly Payment Formula (Amortizing Loan)
M = P × [r(1 + r)ⁿ] / [(1 + r)ⁿ − 1]
Loan Principal (after down payment, trade-in & fees)
P = Vehicle Price − Down Payment − Trade-In + Sales Tax + Fees
Total Interest Paid
Total Interest = (M × n) − P
| Symbol | Name | Description |
|---|---|---|
| M | Monthly payment | The fixed amount paid each month, covering both principal and interest |
| P | Loan principal | The amount actually financed after subtracting down payment and trade-in, and adding tax and fees |
| r | Monthly rate | Annual interest rate ÷ 12 (e.g., 8% APR → r = 0.08 / 12 = 0.00667) |
| n | Number of payments | Loan term in months (e.g., 60 months for a 5-year loan) |
How to Use
- 1Enter the vehicle price: Type the out-the-door sticker price or negotiated sale price before any financing.
- 2Set down payment: Enter a dollar amount or switch to percentage mode. The calculator keeps both values in sync as you type.
- 3Add trade-in value: If trading in a vehicle, enter its dealer-agreed value. This reduces your financed principal.
- 4Select or enter your rate: Use the credit score tier buttons to apply a typical rate for your credit profile, or type a custom rate from your lender.
- 5Choose loan term: Select from 24 to 84 months. Shorter terms mean higher payments but less total interest; longer terms do the opposite.
- 6Add sales tax and fees: Enter your state sales tax rate and any documentation or title fees. These are added to your financed amount.
- 7Press Calculate: Your monthly payment, total interest, and full rate/down-payment analysis appear immediately.
- 8Compare loan offers: Click "Show side-by-side comparison", enter the competing offer's rate and term, then press Recalculate Comparison to see the cost difference.
Example Calculation
$30,000 car, $5,000 down, 8% APR, 60-month loan — how much does it cost in total?
Given:
Vehicle Price = $30,000
Down Payment = $5,000
Sales Tax (8%) = $2,000 (on $25,000 after trade-in credit)
Fees = $400
Principal (P) = $30,000 − $5,000 − $0 + $2,000 + $400 = $27,400
r = 8% / 12 = 0.6667% per month
n = 60 months
M = 27,400 × [0.00667 × (1.00667)⁶⁰] / [(1.00667)⁶⁰ − 1]
Monthly Payment ≈ $556.43
Total Paid = $556.43 × 60 = $33,386
Total Interest = $33,386 − $27,400 = $5,986
What if the rate drops to 6%?
At 6% APR on the same $27,400 over 60 months, the monthly payment falls to $529.95 — saving $26.48/month or $1,589 in total interest. This illustrates why improving your credit score before applying can be worth hundreds or thousands of dollars over the life of the loan.
Understanding Auto Loan — Monthly Car Payment
Auto Loan vs Car Loan vs Car Payment Calculator
Search engines show three different terms — auto loan calculator, car loan calculator, and car payment calculator — but all three solve the same problem: computing the fixed monthly payment on an amortizing vehicle loan. This calculator covers all three use cases in one tool. Whether you're buying from a dealer, a private seller, or refinancing an existing loan, the underlying formula is identical.
How Auto Loan Interest Works
Auto loans use simple interest amortization. Each monthly payment is fixed, but its split between interest and principal changes every month. In the first payment, a larger share goes to interest; in the last, almost all of it pays down principal. This is why paying off a loan early saves disproportionately more than the remaining balance would suggest — you eliminate future interest charges entirely.
- ›Early months: interest portion is high because the unpaid balance is large.
- ›Later months: as the balance falls, each payment applies more to principal.
- ›Prepayment: any extra payment above the scheduled amount goes entirely to principal, shortening the loan and reducing total interest.
The Real Cost of a Longer Loan Term
Stretching a loan from 48 to 72 months reduces your monthly payment but increases total interest — sometimes dramatically. On a $25,000 loan at 9%, extending from 48 to 72 months cuts the monthly payment from $622 to $449, but total interest rises from $4,862 to $7,319. You pay an extra $2,457 for the convenience of lower monthly payments.
The 84-month (7-year) term, increasingly common for new vehicles, compounds this problem. You may still owe more than the car is worth (negative equity) at month 48 when the car's value has depreciated faster than you've paid it off.
The 20% down payment rule
Financial advisors commonly recommend putting at least 20% down on a new vehicle purchase. At 20% down, your LTV starts at 80%, meaning you have immediate equity. Below 80% LTV — especially below 100% where the loan exceeds the car's value — lenders and insurers may require gap coverage to protect against the difference between what you owe and what the car is worth after an accident.
How Credit Score Affects Auto Loan Rates (2024)
Your credit score is the single biggest factor in the interest rate a lender will offer. According to Federal Reserve G.19 data and Experian's State of the Auto Finance Market report, typical new-vehicle rates by credit tier are:
| Credit Tier | Score Range | Typical New Car Rate | Typical Used Car Rate |
|---|---|---|---|
| Super Prime | 781–850 | ≈ 5.1% | ≈ 6.8% |
| Prime | 661–780 | ≈ 6.9% | ≈ 9.1% |
| Near Prime | 601–660 | ≈ 9.5% | ≈ 13.5% |
| Subprime | 501–600 | ≈ 12.8% | ≈ 18.2% |
| Deep Subprime | 300–500 | ≈ 14.5% | ≈ 20.4% |
Tips for Getting a Better Auto Loan Rate
- ›Get pre-approved before visiting the dealer. A pre-approval gives you a rate benchmark and shifts negotiating power from the finance office to you.
- ›Check your credit report first. Errors on credit reports are common and can suppress your score. Dispute any inaccuracies before applying for financing.
- ›Shop multiple lenders. Apply to your bank, a credit union, and at least one online lender. Multiple inquiries within a 14-day window count as one hard inquiry under most scoring models.
- ›Choose a shorter term if you can afford it. The rate itself is usually lower on 36- or 48-month loans than 72- or 84-month loans from the same lender.
- ›Put more money down. A lower LTV ratio reduces lender risk, which can translate to a lower rate offer.
Frequently Asked Questions
What is the difference between an auto loan calculator, a car loan calculator, and a car payment calculator?
All three terms describe the same mathematical problem: finding the fixed monthly payment that repays a loan of principal P over n months at a monthly interest rate r.
- ›"Auto loan calculator" — typically emphasises the full cost of vehicle financing including sales tax and fees.
- ›"Car loan calculator" — interchangeable with auto loan; usually used for passenger vehicles.
- ›"Car payment calculator" — focuses on the monthly payment output rather than the full financing picture.
This calculator covers all three, plus rate comparison, down payment analysis, and a side-by-side loan comparison tool.
How is my monthly car payment calculated?
The formula is the standard amortizing loan equation:
- ›P = financed amount (vehicle price − down payment − trade-in + sales tax + fees)
- ›r = monthly interest rate = annual APR ÷ 12
- ›n = loan term in months
Every payment is the same dollar amount, but the interest/principal split changes monthly. Early payments are interest-heavy; later payments are principal-heavy.
Should I choose a longer or shorter loan term?
The right term depends on your monthly budget and your tolerance for total interest cost:
- ›Shorter terms (36–48 mo): higher monthly payment, lowest total interest, fastest equity buildup.
- ›Longer terms (72–84 mo): lower monthly payment, significantly higher total interest, risk of negative equity.
- ›Most financial advisors recommend not exceeding 60 months for a used car or 72 months for a new car.
Use the rate sensitivity and down payment impact tables in this calculator to find the term that keeps your monthly payment affordable without stretching into high-interest territory.
What is LTV (Loan-to-Value) ratio and why does it matter?
LTV (Loan-to-Value) measures how much you owe relative to what the car is worth:
- ›LTV under 80%: good equity position; no gap insurance required by most lenders.
- ›LTV 80–100%: moderate — normal for new car purchases with a small down payment.
- ›LTV over 100%: negative equity; gap insurance is typically required or strongly recommended.
Gap insurance pays the difference between what your regular auto insurance pays out (the car's current market value) and what you still owe on the loan. It's most important in the first 1–2 years of a loan on a new vehicle, when depreciation is steepest.
Does a larger down payment always make sense?
A larger down payment reduces total interest and improves your equity position from day one. But consider the opportunity cost:
- ›If your loan rate is 8% and savings earn 4%, putting more down saves money — the loan is the more expensive liability.
- ›If your loan rate is 3% and your investment portfolio earns 8%, keeping the cash invested and financing more could make financial sense.
- ›A 20% down payment also eliminates the need for gap insurance and typically helps secure a better rate.
Use the down payment impact table in this calculator to see the dollar difference between 0%, 10%, and 20% down on your specific loan.
How do sales tax and fees affect my loan amount?
Sales tax and fees increase your loan principal, not just your upfront costs. This calculator adds them to the financed amount (the common practice).
- ›Sales tax: typically 5–10% of the vehicle price minus any trade-in allowance in most US states.
- ›Documentation fees: dealer charges for paperwork, typically $100–$900 depending on state caps.
- ›Title and registration: state fees that vary widely, usually $50–$400.
- ›You can pay these out of pocket at closing to reduce your financed amount and save interest.
Does this calculator save my inputs?
Yes — all inputs are saved to localStorage automatically:
- ›Vehicle price, down payment, trade-in, rate, term, tax, and fees are all preserved
- ›The comparison loan fields are also saved
- ›Data stays in your browser — nothing is transmitted
- ›Click Reset All to clear everything, including localStorage