This calculator works out the fixed monthly instalment on a car loan once the price, deposit and any trade-in value have been netted off, spread over the APR and term you enter. It also shows the total interest, which on a vehicle depreciating the whole time is often the number that matters more than the payment itself.
What counts as a reasonable car payment
A widely used budgeting rule caps total transport costs, loan payment included, at around 15-20% of take-home pay, with the loan payment itself usually the largest slice of that. On a 4,500 monthly take-home, that points to a payment somewhere below 675-900 before fuel and insurance are added.
The Federal Reserve's G.19 consumer credit release tracks the average finance rate on new-car loans at commercial banks, and that series has sat in the high single digits through 2025, well above the near-zero promotional rates some buyers still expect from a decade ago. A quoted rate far below the current average usually means a manufacturer subsidy tied to a specific trim or a shorter term than advertised.
Payments also drift upward with vehicle prices rather than rates alone: financing more car for the same monthly budget simply means stretching the term, which is the single biggest driver of loans that outlast the warranty.
Three financing scenarios compared
A 32,000 car with a 5,000 deposit and no trade-in leaves 27,000 financed. At 7.9% APR over 60 months the payment is about 546 a month, and total interest over the loan comes to roughly 5,770 - about a fifth of the amount borrowed.
Keep the term the same but shop a stronger credit score into a 6.5% rate on a 26,000 balance instead, and the payment drops to about 437 with total interest near 5,468. The lower balance and the lower rate are both doing work here, which is why a bigger deposit and a rate-shopping trip pay off together rather than separately.
Stretching the same 20,000 balance at 7% from 48 months to 72 months cuts the payment from about 479 to about 341, a saving of 138 a month, but total interest rises from roughly 2,988 to 4,551 - an extra 1,563 for the privilege of a smaller monthly hit. That trade-off is the one to check most carefully before signing.
Why the payment understates the true cost
The payment formula assumes a fixed rate for the full term and level monthly instalments, which matches most dealer and bank auto loans, but it says nothing about depreciation. A car typically loses 15-20% of its value in the first year, so a long loan on a small deposit can leave you owing more than the car is worth for two or three years - a gap this calculator does not flag, though the negative equity tool on this site does.
It also ignores add-ons folded into the loan amount: extended warranties, GAP insurance and dealer-fitted extras are routinely financed alongside the car, which raises the amount borrowed and therefore both the payment and the total interest shown here. Check the amount financed line against the actual out-the-door price before treating either figure as final.
Dealer-arranged financing sometimes marks the rate up above the rate the lender actually approved, a practice regulators have scrutinised for years. Bringing a pre-approved rate from a bank or credit union into the dealership, and comparing it against what the dealer offers, is the only reliable way to catch a marked-up rate.
Term length, rate resets and regional differences
US auto loans are almost always simple-interest and fixed-rate for the full term, so the number here does not change once signed, unlike a mortgage that can reset. The main variable risk is not the rate but the term: loans of 72 and even 84 months have become common and mechanically produce lower payments alongside much higher total interest, exactly as the 48-versus-72-month comparison above shows.
In the UK, a large share of new-car finance is arranged as PCP (personal contract purchase) rather than a straightforward instalment loan, so a UK quote often shows a lower monthly figure that excludes a large balloon payment due at the end - that is a different product from what this calculator models and the two payments should not be compared directly.
APR quoted by a dealer and APR quoted by your own bank can differ for the same underlying interest rate once fees are included, so always compare the APR figure rather than the flat interest rate when shopping between lenders.
Frequently asked questions
- How is a car loan payment calculated?
- The amount financed - price minus deposit minus trade-in - is spread across the loan term using the standard amortising-loan formula, with the monthly rate applied to the outstanding balance each month. On 27,000 financed at 7.9% over 60 months, that formula returns about 546 a month.
- What is a good interest rate for a car loan?
- It depends on credit tier and whether the car is new or used, but the Federal Reserve's G.19 release puts the average new-car finance rate at commercial banks in the high single digits through 2025. A rate more than a couple of points above that average for your credit tier is worth challenging with a second quote.
- Should I choose a 5-year or 6-year car loan?
- A longer term lowers the monthly payment but raises total interest and extends the period you could owe more than the car is worth. On a 20,000 loan at 7%, stretching from 48 to 72 months saves 138 a month but adds about 1,563 in interest over the life of the loan.
- Does a bigger deposit lower my monthly payment by the same amount as the deposit?
- No. A larger deposit reduces the financed amount, and the payment falls by roughly that reduction divided across the term, adjusted for interest - so a 1,000 bigger deposit typically cuts the monthly payment by well under 1,000 divided by the number of months, since the deposit also removes some of the interest that would have accrued on it.
- Why is my dealer's APR higher than my bank's rate?
- Dealers can add a markup on top of the rate the lending bank actually approves for you. Getting a pre-approved rate from your own bank or credit union before you visit the dealership gives you a real number to compare the dealer's offer against.
- Does the loan payment include insurance and registration?
- No, this figure is principal and interest on the amount financed only. Insurance, registration, sales tax and any extended warranty rolled into the loan increase the amount financed if they are added to the loan, or sit outside it entirely if paid separately, so budget for them apart from the payment shown here.
Sources
- Federal Reserve G.19 — Terms of Credit for New Car Loans — Monthly average finance rate on new-car loans at commercial banks; series has run in the high single digits through 2025.
- CFPB — Auto loans key terms — Defines amortization and APR for auto loans and how dealer markups on financing can occur (guidance current 2024-2025).