Car Loan Calculator: Calculate Your Monthly Payment & Total Interest

A car loan calculator tells you your exact monthly payment and total interest cost before you sign financing paperwork. You enter the vehicle price, your down payment, the annual percentage rate (APR), and the loan term in months.

The calculator uses the standard amortization formula to break down principal and interest across every payment. This lets you compare a 48-month loan at 6.5 % APR against a 60-month loan at 7.2 % APR in seconds, so you see which saves money over the life of the loan.

M = P × [r(1 + r)^n] / [(1 + r)^n – 1]

• M = monthly payment
• P = principal (loan amount after down payment)
• r = monthly interest rate (APR ÷ 12)
• n = number of monthly payments (loan term)

The calculator also builds an amortization schedule that shows how much of each payment goes to principal versus interest. Early payments are interest-heavy; later payments knock down principal faster.

1. 1Find the vehicle price. Use the dealer sticker, online listing, or your negotiated out-the-door price including taxes and fees.
2. 2Enter your down payment. A larger down payment lowers the principal, which cuts both monthly cost and total interest paid.
3. 3Input the APR. Your lender quotes an annual percentage rate; the calculator converts it to a monthly rate automatically.
4. 4Choose the loan term. Common terms are 36, 48, 60, or 72 months. Longer terms mean lower monthly payments but higher total interest.
5. 5Review the results. Check monthly payment, total interest, and total amount paid. Compare multiple scenarios side by side.
6. 6Adjust variables. Increase your down payment or shorten the term to see immediate savings in the output table.

Here's a real worked example comparing two loan structures for a $28,000 vehicle with a $3,000 down payment:

The 48-month loan costs $104 more per month than the 60-month option, but you save $873.48 in interest. The 72-month loan drops the payment to $416.72, yet you pay $1,728.32 more in total interest than the 48-month plan.

Budget clarity. You know whether a $450 monthly payment fits your cash flow alongside rent, insurance, fuel, and maintenance.

APR comparison. Credit unions, banks, and manufacturer financing arms quote different rates. A car loan payment calculator shows you the real cost difference between 5.9 % and 7.4 % APR over 60 months.

Avoid negative equity. Cars depreciate fast. A long loan term can leave you owing more than the vehicle is worth (upside down).

For broader money decisions, visit our [money and debt](/money-and-debt) guides to see how auto debt fits your overall financial picture.

Ignoring insurance costs. Lenders require full-coverage insurance on financed vehicles. That can add $100–$250 per month, squeezing your budget even if the loan payment looks affordable.

Focusing only on monthly payment. A 72-month or 84-month auto loan calculator result may show a low payment, but you'll pay thousands more in interest and risk owing more than the car's value for years.

Skipping the amortization schedule. The schedule reveals how slowly principal drops in the first year. If you plan to trade in or sell early, you need to know your payoff balance.

A car lease calculator works differently. It estimates your monthly lease payment based on the vehicle's capitalized cost, residual value (what it's worth at lease end), money factor (lease interest rate), and lease term.

Use an auto loan calculator when you want to own the vehicle outright after the final payment. Use a lease calculator if you prefer lower monthly costs, plan to drive under the mileage cap, and want a new car every three years.

APR is the annual percentage rate, the yearly cost of borrowing expressed as a percentage of the principal. Lenders convert APR to a monthly rate (APR ÷ 12) inside the payment formula.

• $25,000 loan at 5.5 % APR for 60 months: $475.75/month, $3,545 total interest
• $25,000 loan at 6.5 % APR for 60 months: $489.15/month, $4,349 total interest
• $25,000 loan at 7.5 % APR for 60 months: $502.73/month, $5,163.80 total interest

Shop rates from at least three lenders—your bank, a credit union, and the dealer's finance arm—and plug each APR into the car loan calculator to compare.

Improving your credit score by 30–50 points before you apply can drop your APR by 0.5–1.5 percentage points. Check our [career and income](/career-and-income) section for strategies to free up cash and pay down existing debt faster.

48 months: Balanced option. Monthly payment is manageable, interest cost is moderate, and you're right-side-up on value within 18 months.

60 months: Most popular term. Payment is lower, but interest adds up.

Plug each term into a vehicle loan calculator with your actual APR to see the trade-off in dollars, not just theory.

If you already have a car loan, an auto refinance calculator shows whether refinancing saves money. You enter your current balance, remaining months, current APR, and a new APR offer.

• Your credit score has improved by 50+ points since your original loan.
• Market rates have dropped 1 % or more.
• You can shorten the term without raising your monthly payment above budget.
• You're not underwater (loan balance is less than the car's value).

Run the numbers before you apply; some lenders charge origination fees that erase the first six months of interest savings.

What is the formula for a car loan calculator?

The formula is M = P × [r(1 + r)^n] / [(1 + r)^n – 1], where M is monthly payment, P is principal, r is monthly interest rate (APR ÷ 12), and n is loan term in months. This standard amortization formula splits each payment into principal and interest.

How much car loan can I afford with my income?

Should I use a 60-month or 72-month car loan?

A 60-month loan costs less in total interest and builds equity faster, while a 72-month loan lowers your monthly payment but adds hundreds or thousands in interest and risks negative equity longer. Run both terms in a car loan calculator with your APR to compare total cost.

Does a larger down payment lower my monthly car payment?

Yes. Every $1,000 you add to your down payment reduces the principal by $1,000, which lowers both your monthly payment and total interest paid.

Can I use a car loan calculator for a used car?

A car loan calculator gives you the real numbers—monthly payment, total interest, and amortization schedule—so you walk into the dealership or bank with a clear budget and negotiation leverage. Compare loan terms, test different down-payment amounts, and shop APRs across multiple lenders before you commit.

For more calculators and planning tools, visit our [free tools](/free-tools) page. If you want step-by-step guidance on managing debt or boosting income to afford the car you need, explore our [money and debt](/money-and-debt) and [career and income](/career-and-income) guides.