Auto Loan Refinance Calculator — Keep vs Refinance
Refinance car loan math in one view: compare finishing your current auto loan against a new rate, term, and closing fees — including interest savings and break-even months.
Current loan & refinance offer
Keep current loan
$514.25/mo
43 months · $3,098.74 interest
Refinance
$448.19/mo
48 months · $2,614.07 interest
Estimated interest savings: $484.67
Monthly payment change: $66.06
Fees break even in ~7 months of payment savings
Refinance estimates only. Your lender may use different payoff quotes, fees, or underwriting rules. Check both lenders' payoff quotes before refinancing.
How this is calculated
We compare finishing your current amortization schedule against starting a new loan at the refinanced balance plus fees.
Keep vs refinance
PMT on remaining balance vs new principal at new APR/termBreak-even months = fees ÷ monthly payment savings when savings are positive.
Federal Reserve G.19 · Our methodology →
Related calculators
Common questions
Usually when a lower APR or shorter term cuts total interest by more than fees — and you plan to keep the loan past break-even. See our guide on when to refinance a car loan for the decision checklist.