Car Refinance Calculator

Savings depend on your current rate, new rate, remaining balance, and loan term. For example, refinancing an $18,000 balance from 9.5% APR to 6.5% APR over 36 months saves roughly $900 in total interest and lowers your monthly payment by about $26. The bigger the rate drop and the higher your balance, the more you save. Even a 2-percentage-point reduction on a $25,000 loan can save over $1,500 in interest. Use our calculator above to see your exact savings based on your loan details.

Refinancing typically makes sense when current market rates are at least 1-2 percentage points below your existing rate, your credit score has improved since the original loan, or you want to shorten your loan term to pay less interest. Check the break-even point — divide your total refinancing costs (fees, penalties) by your monthly payment savings. If the break-even is well within your planned ownership period, refinancing is likely worthwhile. Avoid refinancing if you're underwater (owe more than the car is worth), plan to sell soon, or the fees exceed your potential savings.

Common refinancing fees include a title transfer fee ($5-$75 depending on state), lien recording fee ($5-$40), and occasionally an application or origination fee ($0-$300). Some lenders charge no fees at all. Unlike mortgage refinancing, car refinance fees are generally modest — typically $50-$500 total. Check whether your current loan has a prepayment penalty, which can range from 1-2% of the remaining balance. Always factor these costs into your break-even calculation to ensure refinancing actually saves you money.

Refinancing causes a temporary, small credit score dip of 5-10 points from the hard inquiry and new account. The impact fades within a few months. To minimize damage, submit all refinance applications within a 14-day window — credit scoring models treat multiple auto loan inquiries in this period as a single inquiry (rate shopping). Over the long term, refinancing can actually improve your score by lowering your monthly payment (easier to pay on time) and reducing your debt-to-income ratio. Do not refinance multiple times in a short period, as each new account affects your average account age.

Our calculator uses the standard amortization formula that lenders use: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is principal, r is the monthly interest rate (APR ÷ 12), and n is the number of monthly payments. It builds two scenarios — your current loan and the refinanced loan — then compares monthly payments, total interest, and total cost including fees and penalties. The break-even calculation divides your total upfront costs by your monthly payment savings to show how many months until refinancing pays for itself. Results update instantly as you type.

Extending your term lowers your monthly payment but increases total interest paid — sometimes significantly. For example, refinancing $18,000 from 36 months to 60 months at 6.5% drops the monthly payment by about $200 but adds roughly $1,200 in total interest. Only extend the term if you need the cash flow relief and understand the trade-off. A better strategy is to refinance at a lower rate with the same or shorter term, which reduces both your monthly payment and total interest. Our calculator shows both the monthly and total cost impact so you can make an informed decision.