Auto Refinance Calculator
Compare your current car loan with a refinance offer to see the payment change, fee break-even and estimated total cost.
- 2026 figures, checked October 26, 2026
- Private: runs in your browser
- How we check our work
Result
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Verify before you act: review these results with a licensed loan officer or a nonprofit credit counselor before making any decision based on them.
Suggestions for your numbers
Updated as you type, from your inputs only. General information, not personal advice; confirm any change with a qualified professional.
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What is an auto refinance calculator?
An auto refinance calculator compares the payments left on your current loan with payments on a new loan. Enter your current balance, rate and months left, then add the new rate, term and refinance fees. The car refinance calculator estimates the monthly payments and compares the remaining cost of each option.
A refinance car loan calculator can help you look beyond the new monthly payment. A lower payment may come from a lower rate, a longer repayment term, or both. Since extending the term can mean paying for more months, check the estimated total cost as well as the monthly savings.
Why auto refinance calculations matter
A smaller payment can free up cash for other bills, savings or debt payments. But lower monthly cost does not always mean you spend less overall. Compare the new loan’s payments and fees with what you would pay by keeping your current loan.
The result can help you decide whether to request a written offer, ask your current lender about changing your rate, or keep your existing loan. It can also help you judge whether a longer term is worth the added time in debt. The calculator is an estimate based on the details you enter, so check that those details match the lender’s offer.
How to use the auto refinance calculator
- Enter your current loan balance. Use the amount still owed, rather than the car’s original purchase price.
- Enter your current interest rate and the months left on the loan. Check your latest loan statement or contact your lender if you are unsure.
- Enter the rate and term from the refinance offer. Use the offer’s actual proposed term, not a term you have not been offered.
- Add refinance fees. Check the offer paperwork for fees that apply to your loan and include them in the calculator’s fee field.
- Review the current and new payments, monthly difference, break-even estimate and total costs. Compare the total cost before deciding based on the payment alone.
- If you are comparing more than one offer, enter each offer separately. Keep the current loan details the same so you can see how each offer changes the result.
Auto refinance calculator example
Worked example
With a current loan balance of $22,000 at 11% and 48 months left, the current payment is $568.60. A new loan at 7% for 48 months, with $150 in fees, has an estimated payment of $526.82. That is monthly savings of $41.78, and the calculator estimates that costs are recovered in 4 months. Remaining cost on the current loan is $27,293; total cost for the new loan is $25,437. The estimated lifetime difference is $1,856 in favor of refinancing. These results use the sample inputs shown, including the same 48-month term.
How to read your refinance results
Monthly savings is the difference between the estimated current payment and the new payment. Break-even estimates how long it takes for those monthly savings to cover the refinance fees. In the example, the $150 in fees is recovered in 4 months.
Remaining cost on the current loan is compared with the total cost of the new loan, including the fees entered. Lifetime difference shows the estimated gap between those costs. A positive monthly difference does not automatically mean the new offer costs less overall; check the total-cost comparison and confirm the offer terms.
How to improve a car refinance offer
- 01
Ask lenders for written offers
Request the rate, term, fees and payment in writing. Enter each offer into the calculator so you can compare total cost on the same basis.
- 02
Ask about fees
Ask the lender to explain each fee and whether any can be reduced or removed. Enter the fees you will actually pay, not just the advertised payment.
- 03
Compare terms, not just rates
Try to compare offers with the same term when possible. If an offer stretches repayment over more months, weigh the lower payment against the total cost and how long you will have a car loan.
- 04
Check your loan details before applying
Review your current statement and the new offer for the balance, rate and term. Correct inputs make the comparison more useful and help you spot differences between the estimate and the lender’s quote.
Common car refinance calculator mistakes
Choosing an offer by payment alone
A lower payment can result from taking longer to repay the loan. Look at the new term and total cost before treating a smaller payment as savings.
Leaving out fees
Fees can reduce or erase the benefit of a lower rate. Check the offer for costs and enter the amount you expect to pay.
Using the wrong balance or months left
The comparison depends on the amount still owed and the remaining term. Use current loan details rather than the original loan amount or original term.
Treating an estimate as a final quote
The calculator compares the figures you enter. Confirm the final rate, payment, term and fees with the lender before accepting an offer.
The auto refinance formula
Compares the remaining payments on your current loan with the new loan's payments plus fees.
Key terms
- Current loan balance
- The amount still owed on your existing car loan.
- Refinance fees
- Costs charged for setting up or completing the new loan, as entered in the calculator.
- Break-even
- The estimated time for monthly savings to cover the refinance fees.
- Lifetime difference
- The estimated difference between the remaining cost of your current loan and the total cost of the new loan.
Auto refinance questions
When is refinancing a car worth it?
When the new rate is meaningfully lower and you don't stretch the term so far that total interest rises.
What does the break-even result mean?
It estimates how long the monthly savings take to cover the refinance fees. If you expect to sell the car or pay off the loan before that point, consider whether the fee savings can be realized.
Should I choose a longer new loan term?
A longer term may lower the payment, but it can increase the total cost by keeping you in debt longer. Compare the payment and total cost, then decide which trade-off fits your budget.
Why does my lender’s quote differ from the calculator?
The estimate reflects the balance, rates, terms and fees entered. Check that your inputs match the written offer, and ask the lender to explain any remaining difference.
Before you act on this result. Cordwell calculators and guides are educational estimates, not legal, tax, investment, lending or other professional advice. They rely on the numbers you enter and on simplified rules, and they can't see your full situation. Before you file, sign, borrow, invest, hire, change your withholding or form a business based on anything here, meet with a licensed loan officer or a nonprofit credit counselor who can review your specific facts and confirm the numbers. Rules change, and official agency guidance always controls.