Auto Loan Refinance Calculator — Should You Refinance?

Refinancing swaps your current car loan for a new one — usually to grab a lower rate or a smaller payment. Enter your balance, your current rate and months left, and the new rate and term you’re considering.

How this calculator works

We compute the monthly payment on your current balance at your existing rate over the months you have left, then the payment on the same balance at the new rate and term. The difference is your monthly change. Watch the term — a lower rate spread over a longer term can shrink the payment while costing more total interest.

What changes the number

A lower rate with the same or shorter term is the clean win — lower payment and less total interest.
Stretching to a longer term lowers the monthly payment but can raise total interest, even at a lower rate.
Watch for refinance fees and any prepayment penalty on the old loan — net them against the savings.

Frequently asked questions

When is refinancing a car worth it?

When your credit or market rates have improved enough to drop the APR meaningfully, you still owe a fair amount, and there are no heavy fees. The bigger the rate drop and balance, the more you save.

Does refinancing hurt my credit?

The application adds a small, temporary hard inquiry. Done occasionally, the impact is minor and usually outweighed by the interest saved.

Can I refinance if I’m underwater?

It’s harder — lenders may not refinance more than the car is worth. Check your position first with the trade-in equity calculator.