Auto Refinance Calculator

See if refinancing your car loan lowers your payment & total interest

Your current loan

$

The refinance offer

$
Monthly savings
$0
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Auto Refinance Calculator — guide & how to use

What it does

This auto refinance calculator compares your current car loan against a new refinance offer and shows your new monthly payment, your monthly savings, and the total interest you save over the life of the loan. It accounts for any refinance fees. Everything is calculated privately in your browser, free.

How to use it

  1. Enter your current balance, APR, and the months left on your loan.
  2. Enter the new APR and term the lender is offering, plus any fees.
  3. Read your monthly savings, new payment, and lifetime interest saved.

The math behind it

Each payment is the standard amortized loan formula: P = B·r / (1 − (1+r)−n), where B is the balance, r is the monthly rate (APR ÷ 12 ÷ 100), and n is the number of months. Total interest is the sum of all payments minus the balance. Net savings subtracts any refinance fees from the interest you save.

How to embed this tool on your website

No account, no coding. Copy the embed code and paste it where you want it to appear:

<iframe src="https://snaptoolsuite.com/auto-refinance-calculator/?embed=1"
  style="width:100%;max-width:560px;height:920px;border:0;"
  title="Auto Refinance Calculator" loading="lazy"></iframe>
<p>Free <a href="https://snaptoolsuite.com/auto-refinance-calculator/">Auto Refinance Calculator</a> by Snap Tool Suite</p>
2 Paste it on your page
3 It just works

See it live: view a real embed example →

Frequently asked questions

How does refinancing a car loan save money?

A new loan at a lower rate over your remaining balance cuts the interest you pay, lowering both your monthly payment and total cost.

Should I keep the same term?

Keeping the same months left and lowering only the rate gives the cleanest savings. Stretching the term lowers the payment but can raise total interest — this tool shows both.

Is it really free?

Yes. 100% free, everything runs in your browser.

Related tools

Car Loan Calculator · Car Lease vs Buy Calculator · Car Affordability Calculator · Loan Amortization Calculator · Refinance Break-Even Calculator · Car Depreciation Estimator

🔒 Everything is calculated in your browser. We don't store or sell your data.