Car Refinancing Calculator
Dealer financing, a thinner credit file, or simply higher rates when you bought can leave you overpaying on your car loan for years. This car refinancing calculator compares what your current loan will still cost you against a refinance offer, showing the new payment, total savings, and whether the fees are worth it.
Quick Answer
An $18,000 balance at 9% with 48 months left costs $447.93 a month, or $21,501 remaining. Refinancing to 5.5% for 48 months with no fees drops the payment to $418.62, saving $29.31 a month and $1,407 overall, with an immediate break-even.
- Compare remaining cost, not original cost. What you already paid is gone; only the dollars left on each path matter.
- Dealer markups are the most common reason to refinance. The finance office can legally add spread to your approved rate, and many buyers never know.
- Term extensions can erase the savings. A lower rate over a longer term can cost more in total even as the payment falls. Match the term to compare honestly.
- Refinance early for bigger wins. Interest is front-loaded, so the same rate drop saves far more with 48 months left than with 18.
- Quick Answer
- How the refinance comparison works
- Current loan vs refinance, side by side
- How to refinance in five steps
- How other refinance calculators inflate savings
- When a lower payment still loses money: the term-extension trap
- Wells Fargo auto refinance: the honest answer
- Frequently Asked Questions
- Add This Calculator to Your Website
- References
How the refinance comparison works
The calculator prices two futures for the same balance and compares what is left to pay on each.
Your current payment times months left. $447.93 x 48 = $21,501 still to pay.
Balance repriced at the new APR and term, plus any refinance fees.
New payment minus old payment. Negative means savings each month.
Remaining cost minus new cost, shown to the cent with the interest on each loan itemised and the savings split before and after fees. Fees divided by monthly savings give the break-even month when the payment falls and the deal saves money overall; a deal that loses money reads Never, and a deal whose payment rises recovers its fees through lower total interest instead.
Note the honest subtlety: extending the term lowers the payment but can raise total interest. The calculator’s verdict keys off total savings, not the monthly number, because a cheaper payment that costs more overall is not a win.
Current loan vs refinance, side by side
- $3,501 of that is interest
- Paid off in 4 years
- Rate may include dealer markup
- Saves $29.31/mo
- Saves $1,407 total
- Break-even: immediate (no fees)
$18,000 balance. Interest tells the story on its own: $3,501 of interest remains on the current loan against $2,094 on the refinance, and that $1,407 gap is exactly the total savings when fees are $0. The honest saving here is modest because the rate gap is moderate and the refinance comes mid-loan. Bigger gaps and earlier refinances save far more: dropping a 10% loan to 5% with $15,000 left over 48 months keeps about $1,680.
How to refinance in five steps
Pull your current loan details. Balance, APR, months left, and monthly payment from a recent statement or your lender portal.
Check your credit. A higher score than when you bought usually means a better tier. Know your score before you apply.
Get 3-5 offers. Banks, credit unions, and online refinance lenders. Compare APR and term, not just the monthly payment.
Run the numbers here. Plug each offer into the calculator. Reject any offer whose total cost exceeds your remaining cost.
Mind the LTV. You are more likely to be approved with a lower loan-to-value ratio; a car worth less than you owe complicates refinancing.
Before you sign, sanity-check the new payment against your debt-to-income ratio and your overall cost of living. If the current payment is the problem rather than the rate, our auto loan calculator shows how extra principal payments compare against refinancing. If the real alternative is a different car, the BECU auto loan calculator prices a purchase loan with the same payment math, and our Excel auto loan calculator builds the month-by-month schedule behind either loan in a spreadsheet.
How other refinance calculators inflate savings
Most auto refinance calculators we tested compare the original loan against the new loan instead of the remaining cost, which inflates the advertised savings. Several ignore fees entirely, so the break-even is always “immediate”. And nearly all frame the monthly payment as the prize while burying total interest, even though a longer term at a lower rate can cost more overall. This calculator compares remaining cost to new cost, includes fees, and verdicts on total savings.
When a lower payment still loses money: the term-extension trap
The single most useful test in this calculator is a refinance that looks better and is not. Both rows below are the same starting loan ($20,000 owed, 7% APR, 48 months left, $300 of refinance fees) run through the tool above; only the new term changes.
| Refinance offer | New payment | Total cost | Net savings | Verdict |
|---|---|---|---|---|
| 5% APR over 72 months (term stretched) | $322.10, down $156.83 a month | $23,491.10 | -$502.71 | Not worth refinancing |
| 5% APR over 36 months (term shortened) | $599.42, up $120.49 a month | $21,879.05 | $1,109.35 | Worth refinancing |
Stretching the term drops the payment by $156.83 a month and still loses $502.71 overall, because total interest climbs even as the rate falls. Shortening the term does the mirror image: the payment rises $120.49 a month and the deal saves $1,109.35. Payment direction and savings direction are independent, which is why this calculator verdicts on total savings, never on the monthly number alone.
The break-even line now says what these two cases actually mean. Break-even is fees divided by monthly savings, which assumes the monthly saving is what repays the fees, so the calculator only prints a months figure when the payment falls and the deal saves money overall. On the stretched loan, which loses money overall, it reads “Never — this refinance loses money overall” instead of the misleading 1.9 months an earlier version printed. On the shortened loan, whose payment rises, it reads “Not applicable — the fees are recovered through lower total interest, not through monthly payment savings” instead of a bare “Never”. Read the verdict first; the break-even line now backs it up instead of contradicting it.
Wells Fargo auto refinance: the honest answer
If you searched for a Wells Fargo refinance by name, you deserve the plain fact first: Wells Fargo does not offer auto loan refinancing at this time. Its own Auto Loan FAQs say so directly, and its purchase auto loans are available only through its dealership network. Calculator Zilo is not affiliated with Wells Fargo.
The comparison you came for still works, because the math does not care which lender issued the quote. Enter your current loan and any refinance offer, from a bank, a credit union, or an online lender, and the calculator above prices both sides, fees included, exactly as it would have with a Wells Fargo quote.
Frequently Asked Questions
Three triggers: you suspect dealer rate markup, market rates have fallen since you bought, or your credit score has climbed into a better tier. Refinancing earlier in the loan saves more because interest is front-loaded.
It depends on the rate gap and timing. A 9% to 5.5% refinance on $18,000 with 48 months left saves about $1,407. Lenders report typical customer savings of $105-$159 a month, though your mileage will vary.
There is a small temporary dip from the inquiry and new account. Shopping multiple lenders within about two weeks generally counts as a single inquiry for scoring.
Sometimes, especially if your score improved since the original loan or you can document stable income. Specialized refinance lenders work with lower credit tiers, though the rate improvement may be modest.
Many auto refinance loans have no origination fee, but some charge processing or title fees. Any fee delays your break-even; this calculator includes fees in the comparison.
It is harder. Lenders look at loan-to-value, and being underwater limits options. A larger down payment on the refinance or paying down the balance first can help.
Only if you need the lower payment and accept the tradeoff: a longer term at a lower rate can still cost more in total interest. Match your remaining term for an apples-to-apples comparison.
Add This Calculator to Your Website
References
- Wells Fargo. Auto Loan FAQs (no auto loan refinancing offered; purchase loans through dealerships only). Accessed October 21, 2026.
- Consumer Financial Protection Bureau. Auto Loans (consumer guide to shopping for and comparing auto loans). Accessed October 21, 2026.
- Consumer Financial Protection Bureau. What is APR? Accessed October 21, 2026.
- Consumer Financial Protection Bureau. What things can I negotiate when shopping for a car or auto loan? Accessed October 21, 2026.
- Consumer Financial Protection Bureau. Auto Loan Worksheet (Know Before You Owe). Accessed October 21, 2026.
- Consumer Financial Protection Bureau. How does shopping around for a loan affect my credit? (rate-shopping window). Accessed October 21, 2026.
- Board of Governors of the Federal Reserve System. Consumer Credit: G.19 Statistical Release (auto loan terms at commercial banks). Accessed October 21, 2026.
- Experian. Average Car Payment (State of the Automotive Finance Market data). Accessed October 21, 2026.