Car Loan Refinance Savings Calculator
Thinking about refinancing your auto loan? This refinance car loan calculator compares your current loan against a new offer side by side — monthly payment, total interest, break-even point, and net savings after fees — so you can see whether refinancing actually saves you money.
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Refinance comparison
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Total cost: current vs new loan
Estimates only — not lending advice. Assumes fixed rates, on-time payments, and that the new loan covers the full current balance. Actual offers vary by lender, credit history, and state fees.
How to use this calculator
Start with your current loan: enter the remaining balance, the APR you are paying today, and how many months are left. Then enter the refinance offer — the new APR, the new term, and the total fees the lender charges to close the new loan.
Watch the monthly savings and net savings figures. A lower payment alone does not prove the refinance is a good deal — if the new term is much longer, you can pay more interest overall. Net savings subtracts the fees from your total interest savings, so it reflects the real bottom line.
How it works
Each monthly payment is computed with the standard amortization formula:
M = P × r(1+r)n / ((1+r)n − 1)
where P is the loan balance, r is the monthly rate (APR ÷ 12), and n is the number of months. Total interest on each loan is (payment × months) − balance. Monthly savings is the current payment minus the new payment. Net savings is the total interest saved minus refinance fees, and the break-even point is fees divided by monthly savings — the number of months until the lower payment has paid back the closing costs.
Frequently asked questions
Should I refinance my car loan?
Refinancing makes sense when the new loan has a meaningfully lower interest rate, your credit score has improved since you bought the car, or you need a lower monthly payment. It usually does not pay off if the rate drop is tiny, your loan is almost paid off, or the fees eat the savings — run the numbers above to compare.
How long does it take to break even on a car loan refinance?
Divide the total refinance fees by your monthly payment savings. If you pay $500 in fees and save $50 a month, you break even in 10 months. Any savings after that point are real money in your pocket — but only if you keep the car and the loan that long.
Does refinancing a car loan hurt my credit?
There may be a small, temporary dip from the hard credit inquiry and the new account lowering your average account age. Multiple auto-loan inquiries within a short shopping window are usually treated as a single inquiry by scoring models, and the score typically recovers within a few months of on-time payments.
Can I refinance into a longer loan term?
Yes — extending the term lowers your monthly payment, but it can raise the total interest you pay over the life of the loan, even at a lower rate. This calculator compares total interest on both loans so you can see the full trade-off, not just the monthly payment.
What fees come with refinancing a car loan?
Common fees include a lender origination or application fee, title transfer and state lien-recording fees, and sometimes a prepayment penalty on your old loan. Enter your best estimate of the total in the refinance fees field — the calculator subtracts it from your interest savings to show net savings.