Car Refinance Calculator
Enter your current loan balance, interest rate, and remaining term, then enter the new rate and term you have been offered. The calculator shows your new monthly payment, monthly savings, total interest saved, and a full amortization schedule for both loans so you can see exactly where the savings come from.
How car refinancing works
When you refinance a car loan, a new lender pays off your existing loan and issues you a new one with different terms. The key variables are the interest rate and the loan term. A lower rate reduces how much interest accrues each month. A shorter term increases your monthly payment but cuts total interest. A longer term lowers monthly payments but increases what you pay over time. Refinancing is most beneficial when your credit score has improved since you took out the original loan, when market rates have fallen, or when you originally financed through a dealership at a higher-than-market rate.
When refinancing makes financial sense
The strongest case for refinancing is when you can secure an interest rate at least 1-2 percentage points below your current rate, your credit score has improved significantly since origination, and you have enough time left on the loan for the savings to be meaningful. Refinancing in the first few months is usually pointless because most early payments go toward interest anyway. Similarly, refinancing in the final year rarely saves enough to justify the paperwork. The sweet spot is typically the middle third of your loan. Always account for any origination or title transfer fees in your calculation - this calculator includes a fee field precisely for that reason. If fees push your break-even date beyond your planned ownership period, refinancing may not be worth it.
Monthly payment vs total interest tradeoff
Lengthening your loan term lowers your monthly payment but increases total interest paid because interest accrues on the outstanding balance for more months. For example, refinancing a $15,000 balance from 48 months at 9% to 60 months at 6% drops the monthly payment by roughly $80 but costs more in total interest. Shortening the term does the opposite: your payment rises but you clear the debt sooner and pay less interest overall. This calculator shows both figures side by side so you can make the tradeoff consciously rather than focusing only on the monthly payment number.
How to get the best refinance rate
Credit unions consistently offer lower auto loan rates than banks or dealership finance departments - membership is often easier to obtain than people assume. Online lenders such as LightStream, PenFed, and RefiJet specialize in auto refinancing and can be competitive. Rate shopping within a 14-day window is treated as a single inquiry by FICO scoring models, so getting multiple quotes does not significantly harm your credit. Before applying, check your credit report for errors, pay down other revolving balances if possible, and confirm your vehicle qualifies (most lenders exclude cars older than 10 years or with over 100,000-125,000 miles).
Typical auto loan APR ranges by credit score (2026)
| Credit score range | Credit tier | Typical APR range | Refinance potential |
|---|---|---|---|
| 750 and above | Excellent | 4% - 6% | Already competitive |
| 700 - 749 | Good | 6% - 8% | Moderate savings possible |
| 650 - 699 | Fair | 8% - 13% | Good savings if score improved |
| 600 - 649 | Poor | 13% - 18% | High savings if score improved |
| Below 600 | Very poor | 18%+ | Refinance after building credit |
Rates shown are approximate averages for new and used car loans. Actual offers vary by lender, loan term, and vehicle age.
Frequently asked questions
Does refinancing a car loan hurt your credit score?
Applying for a refinance triggers a hard inquiry, which typically lowers your score by a few points temporarily. However, if you rate-shop within a 14-day window, credit bureaus count all auto loan inquiries as a single inquiry. Once the new loan is open, your score usually recovers within a few months - and a lower monthly payment can improve your overall debt-to-income profile over time.
How much can I save by refinancing my car loan?
Savings depend on the rate difference, remaining balance, and term. A 3% rate reduction on a $20,000 balance with 48 months remaining saves roughly $1,200-$1,500 in total interest. Use this calculator with your actual numbers to get a precise figure. The monthly savings and total interest saved are both shown so you can see the full picture.
What are typical refinancing fees for a car loan?
Auto loan refinancing fees are usually much lower than mortgage refinancing. You may encounter an origination fee ($0-$200 at most lenders), a title transfer fee ($15-$75 depending on your state), and in some states a registration update fee. Many online lenders charge no origination fee at all. Enter any expected fees into the refinancing fees field to see how they affect your break-even period.
Can I refinance if my car loan is almost paid off?
Technically yes, but it rarely makes sense. If you have fewer than 12 months remaining, the interest savings are small, and closing costs could outweigh any benefit. Refinancing is most worthwhile when you have at least 18-24 months left on your loan.
What credit score do I need to refinance a car loan?
Most lenders require a minimum score of around 600, but the best rates go to borrowers with scores above 700-720. If your score has improved since you took out the original loan - even by 50-100 points - you may now qualify for a significantly lower rate. Check your current score before applying so you know what tier of rates to expect.
Should I shorten or lengthen my loan term when refinancing?
If you want to minimize total interest paid and can afford a higher payment, shorten the term. If your priority is freeing up cash flow each month, a longer term achieves that but you will pay more interest overall. The ideal approach is to take the lower rate with the same remaining term - that way you save on rate without extending the repayment period. This calculator lets you test both scenarios.