Auto Loan Calculator
Estimate your monthly car payments, see your true loan interest, and check how extra payments help get you out of debt faster.
Enter your car price, down payment, and interest rate above to calculate your monthly car payment instantly.
How to Use This Calculator
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1
Enter Vehicle Price & Down Payment
Start with the negotiated out-the-door price and what you have in cash or trade-in equity. Switch between $ and % with the toggle button to see the conversion right underneath.
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2
Select Your Interest Rate & Term
Type in your annual percentage rate (APR) and choose how many months you want to pay. 60 months is the sweet spot for many buyers, while shorter terms save on interest.
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3
Add Optional Extra Monthly Payments
Test out paying an extra $25 or $50 each month toward the principal. You'll see immediately how many months drop off the loan calendar.
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4
Review Your Live Numbers
Your monthly payment, lifetime interest, and payoff timeline update instantly as you change any field. Hit Try an example if you want to see a standard scenario.
The Formula
Automobile loans use the standard fixed-rate amortization formula to calculate monthly payments:
Here is what each parameter represents in plain English:
- M Monthly Car Payment: The fixed payment due every month covering your principal and financing fee.
- P Principal Loan Balance: The money you borrow (car purchase price minus down payment).
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r
Monthly Interest Rate: Your annual APR divided by 12 months and divided by 100 (for example, 6.5% APR works out to 0.065 ÷ 12 ≈ 0.005417 per month). When the interest rate is 0%, the equation simplifies to
M = P ÷ n. - n Total Loan Term in Months: The complete duration of the loan in months (such as 36, 48, 60, 72, or 84 months).
Why extra payments save interest on auto loans: Auto loans charge interest monthly on your outstanding debt. Knocking down that balance early starves future interest. Every extra $50 you send helps you build positive equity faster and dodge being stuck underwater.
Example
Here is a realistic financing scenario with step-by-step math. We always run this check before signing paperwork. I've never signed a car loan myself, but every quote I've watched friends accept ran 60 to 72 months — and nobody ever asked what the interest would total. Here is how the numbers shake out:
Applying the formula step by step:
- Calculate compounding factor:
(1 + 0.00541667)&sup6;° ≈ 1.382817 - Calculate numerator:
$27,000 × [0.00541667 × 1.382817] = $202.24 - Calculate denominator:
1.382817 − 1 = 0.382817 - Calculate monthly payment:
M = $202.24 ÷ 0.382817 = $528.29 per month - Total of 60 payments:
60 × $528.29 = $31,697 - Total lifetime interest paid:
$31,697 − $27,000 = $4,697 - Total cost of vehicle ownership:
$3,000 (down payment) + $31,697 (payments) = $34,697
By putting down 10%, the borrower reduces their borrowed principal to $27,000, establishing initial equity and keeping monthly carrying costs manageable.
Frequently Asked Questions
How much should I put down on a car?
Most advisors suggest putting down 20% on a brand new car or 10% on a used vehicle. New cars drop in value the minute you drive off the lot. A healthy down payment keeps you from owing more than the car is worth and gets you better rate offers.
What loan term should I choose?
Honestly, 84-month car loans are usually a trap that leaves you underwater for years. Even though stretching a loan to 72 or 84 months shrinks your monthly payment, you'll pay thousands more in cumulative interest. No first car loan yet — but the quotes I've seen around me swing from roughly 5% for strong credit to more than double that, and credit score was always the dividing line. Sticking to 48 or 60 months keeps total financing costs sane and helps you build real equity.
Does my credit score affect my rate?
Lenders look at your credit score before anything else. A buyer with a 740 score might get an APR under 6%, while a lower score can easily push rates past 12% or 15%. On a $27,000 loan, that difference alone can cost you $4,000 to $8,000 in pure interest.
What's the difference between an interest rate and APR?
The interest rate covers only the base borrowing cost, while the APR wraps in dealer origination fees and financing charges. Since APR shows the true total cost of borrowing, always compare loan offers by their APR rather than their base rate.
Can I pay my car loan off early?
Almost all modern auto loans allow prepayment without any penalty fee. Just call your lender or check your online portal to ensure extra payments are applied directly to the principal balance rather than advancing your next due date.