Last updated: April 25, 2026
Car Loan Calculator
M = P[r(1+r)^n] / [(1+r)^n - 1]P = Loan Amount | r = Monthly Rate | n = Months
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| Rate | Monthly | Total Interest | Total Cost |
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| Down % | Amount | Monthly | Int. Saved |
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A car loan calculator tells you exactly how much you will pay each month, how much interest you will pay over the life of the loan, and what the vehicle truly costs you once financing is factored in. A $25,000 car financed at 7% for 60 months costs $495 per month and a total of $29,700 — meaning you pay $4,700 in interest on top of the purchase price.
Most car buyers focus on the sticker price and negotiate from there — but the monthly payment and the total interest paid are often more important numbers. A lower interest rate, a larger down payment, or a shorter loan term can save thousands of dollars over the life of the loan. Understanding how each variable affects your payment before you walk into the dealership puts you in a far stronger negotiating position.
Use this free Car Loan Calculator to instantly compute your monthly payment, total interest, and full loan cost for any combination of loan amount, interest rate, and term. No sign-up required.
How a Car Loan Works
A car loan is an installment loan — you borrow a fixed amount, pay it back in equal monthly payments over a set period, and each payment covers both a portion of the principal (the amount borrowed) and the interest charged on the outstanding balance. This structure is called amortization.
In the early months of the loan, the majority of your monthly payment goes toward interest because the outstanding balance is highest. As you pay down the principal, the interest portion shrinks and the principal portion grows — even though your monthly payment stays the same. This is why paying off a car loan early can save a meaningful amount of interest.
Car Loan — Key Terms
Principal: The amount you borrow (vehicle price minus down payment and trade-in value). Interest Rate (APR): The annual percentage rate charged on the outstanding balance. Loan Term: The number of months over which you repay the loan (typically 36–84 months). Monthly Payment: The fixed amount due each month, covering principal and interest. Total Interest: The total extra cost of borrowing above the principal amount.
Car Loan Payment Formula
The monthly payment on a car loan is calculated using the standard loan amortization formula:
| M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ − 1] |
Where: M = Monthly payment | P = Loan principal (amount borrowed) | r = Monthly interest rate (annual rate ÷ 12) | n = Total number of monthly payments (years × 12)
Step-by-Step Example
Loan: $20,000 at 5.5% APR for 60 months
- Monthly rate (r): 5.5% ÷ 12 = 0.4583% = 0.004583
- Number of payments (n): 60
- Payment (M): $20,000 × [0.004583 × (1.004583)⁶⁰] ÷ [(1.004583)⁶⁰ − 1]
- Result: Monthly payment = $382.59
- Total paid: $382.59 × 60 = $22,955.40
- Total interest: $22,955.40 − $20,000 = $2,955.40
You don’t need to calculate this manually — the car loan calculator does it instantly. But understanding the formula confirms that three variables control everything: the principal, the interest rate, and the loan term. Changing any one of them changes your payment and your total cost.
Car Loan Payment Examples
The table below shows monthly payments, total amounts paid, and total interest for common loan scenarios:
| Loan Amount | Rate | Term | Monthly Pmt | Total Paid | Interest |
| $20,000 | 5.5% | 48 months | $462.19 | $22,185.12 | $2,185.12 |
| $20,000 | 5.5% | 60 months | $382.59 | $22,955.40 | $2,955.40 |
| $20,000 | 5.5% | 72 months | $329.98 | $23,758.56 | $3,758.56 |
| $25,000 | 7.0% | 60 months | $495.01 | $29,700.60 | $4,700.60 |
| $30,000 | 4.5% | 60 months | $558.78 | $33,526.80 | $3,526.80 |
| $35,000 | 6.0% | 72 months | $581.00 | $41,832.00 | $6,832.00 |
The most important pattern in this table: longer terms reduce your monthly payment but dramatically increase total interest. Extending a $20,000 loan from 48 months to 72 months saves $132 per month — but costs an extra $1,573 in additional interest over the life of the loan.
Loan Term Comparison — $20,000 at 5.5% APR
Choosing the right loan term is one of the most impactful financial decisions in a car purchase. Here is how a $20,000 loan at 5.5% APR looks across every common term:
| Loan Term | Monthly Payment | Total Interest | Best For |
| 36 months | $604.48 | $1,761.28 | Lowest total cost |
| 48 months | $462.19 | $2,185.12 | Balanced choice |
| 60 months | $382.59 | $2,955.40 | Most common term |
| 72 months | $329.98 | $3,758.56 | Lower payment budget |
| 84 months | $290.71 | $4,419.64 | Tight cash flow only |
The 60-month term is the most common because it balances an affordable payment with a reasonable total interest cost. The 36-month term saves the most money but requires a payment $222 higher than the 60-month option. The 84-month term has the lowest payment — but you pay $2,658 more in interest compared to a 36-month loan, and you risk being underwater on the loan (owing more than the car is worth) for much of the term.
How to Use the Car Loan Calculator
Step 1 — Enter the Vehicle Price
Enter the full purchase price of the vehicle. This is the agreed selling price before any down payment or trade-in is applied.
Step 2 — Enter Your Down Payment and Trade-In Value
Enter your down payment and the value of any trade-in vehicle. Both reduce the amount you need to finance. A larger down payment means a smaller loan, lower monthly payments, and less total interest paid.
| Loan Amount = Vehicle Price − Down Payment − Trade-In Value |
Step 3 — Enter the Interest Rate (APR)
Enter the annual percentage rate (APR) offered by your lender. The APR is your yearly interest rate — the calculator converts it to a monthly rate automatically. Your APR depends on your credit score, the lender, and whether you are buying new or used.
Step 4 — Enter the Loan Term
Select the number of months for your loan. Common options are 36, 48, 60, 72, and 84 months. The calculator shows how your payment and total interest change for each term, helping you compare options side by side.
Step 5 — Read Your Results
The calculator returns your monthly payment, total amount paid, and total interest. Use these figures to compare loan offers from different lenders, evaluate whether a longer term is worth the extra interest cost, and determine whether the car fits your monthly budget.
Factors That Affect Your Car Loan Interest Rate
Credit Score
Your credit score is the single biggest factor in your interest rate. Borrowers with excellent credit (720+) typically qualify for rates of 4%–6% on new cars. Borrowers with fair credit (580–669) may face rates of 10%–15% or higher. On a $25,000 loan over 60 months, the difference between a 5% and a 12% rate is more than $5,000 in extra interest. Checking your credit report and addressing any errors before applying can meaningfully lower your rate.
New vs. Used Vehicle
New car loans almost always carry lower interest rates than used car loans. Lenders view new cars as less risky collateral because their value is known and their condition is guaranteed. A new car might qualify for a manufacturer promotional rate of 0%–2.9%, while a used car purchased through a private seller may carry a rate of 8%–14% depending on the vehicle age and borrower credit profile.
Loan Term Length
Longer loan terms generally carry slightly higher interest rates in addition to generating more total interest through the extended repayment period. A 72-month loan may carry a rate 0.5%–1.0% higher than a 48-month loan from the same lender — compounding the cost disadvantage of the longer term.
Lender Type
Credit unions typically offer the lowest auto loan rates — often 0.5%–2.0% below bank rates — because they are member-owned nonprofits. Banks and online lenders offer competitive rates with fast pre-approval. Dealer financing is convenient but is often the most expensive option; dealers earn a markup on the rate the lender quotes them. Always get pre-approved from a bank or credit union before visiting a dealership.
Common Car Loan Mistakes to Avoid
Mistake 1 — Focusing Only on the Monthly Payment
Dealers know that most buyers think in monthly payment terms, not total cost. A dealer who extends your term from 48 to 72 months drops your payment by $132 — but adds $1,573 in interest. Always evaluate the total cost of the loan, not just the payment. If a dealer asks “what monthly payment are you comfortable with?” — decline to answer and negotiate on vehicle price and interest rate instead.
Mistake 2 — Skipping the Pre-Approval Step
Walking into a dealership without pre-approval from a bank or credit union gives the dealer complete control over your financing. Pre-approval establishes your maximum rate before you arrive, gives you a concrete number to beat, and removes financing from the negotiation entirely. It takes 15 minutes online and can save hundreds to thousands of dollars.
Mistake 3 — Rolling Negative Equity Into the New Loan
If you owe more on your current car than it is worth — called being underwater or upside-down — rolling that negative equity into a new loan means you start the new loan already owing more than the car is worth. This creates a cycle of escalating debt. Pay down the existing loan or wait until you have positive equity before trading in.
Final Thoughts
A car loan calculator reveals the true cost of financing before you commit to anything. Three variables control your outcome: the loan amount (lowered by a larger down payment), the interest rate (lowered by a better credit score and competitive lender), and the loan term (shorter terms cost less in total interest). Use the calculator above to run every combination before stepping into a dealership — knowing your numbers is the most powerful negotiating tool you have.
Also useful: our free Mortgage Calculator, Loan Calculator, and Amortization Calculator for related borrowing and repayment tools.
Frequently Asked Questions
How is a car loan monthly payment calculated?
Car loan payments use the loan amortization formula: M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ − 1], where P is the principal, r is the monthly interest rate (annual rate ÷ 12), and n is the number of months. Each payment covers accrued interest on the remaining balance plus a portion of the principal. The car loan calculator applies this formula automatically.
What is a good interest rate for a car loan?
A good car loan rate depends on your credit score and whether the vehicle is new or used. Borrowers with excellent credit (720+) typically receive 4%–6% APR on new cars and 5%–8% on used cars. Average credit borrowers (670–719) should expect 7%–10%. Rates above 15% indicate poor credit or a subprime lender and should prompt credit improvement before purchasing if possible.
How much should I put down on a car?
Financial experts generally recommend a down payment of at least 20% for a new car and 10% for a used car. A larger down payment reduces the loan amount, lowers your monthly payment, reduces total interest paid, and prevents you from being underwater on the loan (owing more than the car is worth). If 20% is not feasible, any down payment is better than none.
What loan term is best for a car?
The 48- to 60-month term is the best balance for most buyers — it keeps payments manageable without excessive interest cost. Avoid 72- and 84-month terms unless your budget absolutely requires the lower payment. Long terms increase total interest significantly and leave you at risk of being underwater on the loan for years, since cars depreciate faster than long-term loans are paid down.
Does a car loan affect my credit score?
Yes — in several ways. Applying for a car loan triggers a hard inquiry that temporarily lowers your score by a few points. Once approved, the loan appears as new debt, which can lower your average account age. However, making consistent on-time payments builds your payment history — the most important credit score factor — and improves your score over time. A car loan managed responsibly is a net positive for credit.
Can I pay off my car loan early?
Yes, and in most cases it is financially beneficial. Paying off a car loan early reduces the total interest you pay because interest accrues on the outstanding balance. Check your loan agreement for prepayment penalties before paying early — most modern auto loans have none, but some lenders charge a fee. Even making one extra payment per year can meaningfully reduce total interest and shorten the loan term.
What is the difference between APR and interest rate on a car loan?
For most auto loans, the APR (Annual Percentage Rate) and the stated interest rate are identical or very close. APR is the broader measure that includes any fees or costs associated with the loan. On a simple auto loan with no origination fees, APR equals the interest rate. On loans with added fees or dealer markups, APR may be slightly higher than the stated rate — always compare APR, not just the interest rate, when shopping loan offers.
How do I lower my car loan payment?
Four ways to lower your monthly payment: (1) Increase your down payment to reduce the loan amount. (2) Improve your credit score before applying to qualify for a lower interest rate. (3) Extend the loan term — though this increases total interest paid. (4) Choose a less expensive vehicle. Of these, improving your credit score and increasing your down payment are the most financially sound because they reduce your total loan cost, not just the monthly payment.
About This Calculator: This car loan calculator is part of Intelligent Calculator’s Finance suite — built on standard loan amortization methodology. Free. No sign-up required.