Auto Loan Calculator – Monthly Car Loan Payments

Shopping for a car? Enter the loan amount, APR and term to see your monthly payment, total interest and total cost — with a month-by-month amortization table that shows exactly where each dollar goes.

How to Use the Auto Loan Calculator

Enter the loan amount you need — say $25,000 for a used car — then the annual percentage rate (APR) the lender quotes. Enter the term in months: 36, 48, 60 or 72 are typical for auto loans in the US, while personal loans are usually shorter.

Press Calculate Payment to see your fixed monthly payment, the total interest you will pay over the whole loan, and the grand total leaving your pocket. Below that, the amortization table breaks your first 12 payments into principal and interest — the eye-opener that shows how little of your early payments actually reduces the debt.

Loan Payment Formula

The formula keeps your monthly payment identical from the first payment to the last, even though the interest portion shrinks each month. It balances this precisely: it is the payment amount whose present value, discounted at the monthly rate over n months, exactly equals the loan principal.

Each month the lender charges interest on the remaining balance (balance × r) and the rest of your payment chips away the principal. Because the balance is biggest at the start, early payments are interest-heavy — a mathematical fact, not a lender trick, but one worth seeing in numbers.

Worked Example

$25,000 auto loan at 7.5% APR for 60 months. Monthly rate r = 7.5 ÷ 12 ÷ 100 = 0.00625:

You repay $5,056.92 in interest — about 20% on top of the car's financed price — for the convenience of spreading payment over five years. That number is the true price of the loan, and comparing it across lenders is the single most useful thing this calculator does.

First-Year Amortization — Where Your Money Really Goes

Almost no free loan calculator shows you the monthly split, yet it is the most revealing part of any loan. Here is the verified first-year schedule for the $25,000 / 7.5% / 60-month example (the tool generates this live for your own inputs):

Read it as a story: in month 1, nearly a third of your payment is pure interest; by month 12 the interest share has fallen below a third while the principal share keeps climbing. Two lessons follow. First, extra payments early save the most — $2,000 paid in month 2 wipes out far more future interest than the same amount in month 50. Second, refinancing hurts least early on, when the balance is still high. This is an estimate for guidance, not financial advice.

Limitations

The calculator assumes a fixed APR with no fees — real US auto loans add origination fees, dealer documentation fees, and state sales tax on the purchase (not included here). It does not model down payments, trade-in values, variable rates, or balloon payments. Prepayment penalties are rare in the US but check your contract. Term is capped at 600 months. For the final word on any loan, read the lender's truth-in-lending disclosure and payment schedule, not just the monthly payment.

Sources & References

The math above is the standard amortization formula every lender uses. For the consumer side of an auto loan — what a dealer must disclose and how to compare offers — the federal consumer watchdog is the place to start:

• Consumer Financial Protection Bureau — Consumer tools and guides: the CFPB’s free guides and worksheets, including its auto-loan shopping resources.

A personal loan and a mortgage are the same machinery at different scales — principal, interest, escrow and insurance behave differently when a house is involved. The guide to how mortgage payments work breaks down P&I, escrow and PMI so you can see exactly where each monthly dollar goes.

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