Auto Loan Refinance Calculator
See your new monthly payment, interest savings, and break-even point before refinancing your auto loan.
TL;DR: Auto Loan Refinance Calculator is a free, browser-based tool that lets you see your new monthly payment, interest savings, and break-even point before refinancing your auto loan.
Your current loan
Refinance offer
About this tool
Compare your current auto loan against a refinance offer to see the real numbers: new monthly payment, total interest over the life of each loan, and how long it takes any refinance fees to pay for themselves. Refinancing an auto loan can lower your rate, but it can also quietly cost you more overall if the new term is longer than what's left on your current loan — this calculator runs both scenarios side by side so that trade-off is visible before you sign anything.
Key Features
- Compares your current loan against a specific refinance offer
- Shows the new monthly payment and the monthly savings (or cost)
- Calculates total interest under both the current and new loan
- Includes refinance fees in a break-even calculation
- Warns explicitly when a longer new term increases total interest despite a lower rate
- Runs entirely in your browser — no financial details are ever uploaded
How to Use
- Enter your current loan's remaining balance, APR, and months remaining.
- Enter the new APR and term being offered.
- Enter any refinance fees, if there are any.
- Click Compare to see the new payment, savings, and break-even point.
When to use it
- Deciding whether a refinance offer that arrived in the mail or email is actually worth taking
- Comparing two different refinance offers by running each one through separately
- Checking whether a lower monthly payment from a longer term is actually costing more in total interest
- Working out how many months of savings it takes to recoup a refinance origination fee
- Getting real numbers to bring into a negotiation with a lender or credit union
Tips & limitations
- A lower monthly payment isn't automatically a win — if the new term is longer than the months you have left, you can end up paying more total interest even at a lower rate, which this tool calculates directly rather than leaving you to estimate
- Break-even in months is fees divided by monthly savings — if you plan to sell or trade in the car before that point, the refinance may not be worth the fees
- Some lenders roll fees into the loan itself rather than charging them upfront — if that's the case here, add that amount to the new balance rather than the fees field
- This assumes both loans have a fixed rate for their full remaining term; it doesn't model a variable-rate loan
The term-extension trade-off, with real numbers
| Scenario | Rate | Term | Total interest |
|---|---|---|---|
| Original loan | 9% | 12 months left | $988 |
| Refinanced | 5.5% (lower rate) | 72 months (much longer) | $3,527 |
Despite the lower rate, stretching from 12 months to 72 months means paying interest for six times as long — the monthly payment drops, but total interest more than triples. This is the exact scenario the break-even and total-interest figures below are built to catch.
Frequently Asked Questions
- Yes — if the new loan's term is meaningfully longer than what's left on your current loan, the extra months of interest can outweigh the benefit of the lower rate. This calculator shows total interest for both scenarios specifically so that trade-off is visible.
- There's no universal answer, but the shorter the better relative to how long you plan to keep the car — a break-even of 6 months is a much easier case than one of 40 months on a loan with 48 months left.
- No — this only compares the two loans' payment and interest math. Being "upside down" (owing more than the car is worth) is a separate consideration some lenders factor into refinance eligibility.
- If a fee is rolled into the new loan amount, add it to the new balance so the new payment reflects it accurately; use the fees field only for costs paid upfront, separately from the loan.
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