CodeItBro

Auto Loan Calculator

Estimate your monthly payment, total interest, payoff timeline, and the impact of extra payments before buying your next vehicle.

Know the deal before you sign

Dial in your sticker price, taxes, down payment, and APR to see the true cost of ownership. Use extra payments to test payoff strategies or compare sample scenarios below.

Loan inputs

Adjust the numbers to match your purchase plan.

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$
$
%
$

Try $25-$100 to see how faster payoff saves interest.

Roll taxes & fees into the loan

Uncheck this if you plan to pay tax and fees on delivery day.

How this auto loan calculator works

  1. We determine the financed amount by subtracting trade-in/down payment and optionally adding taxes/fees.
  2. Monthly payments use the standard amortization formula based on your APR and term.
  3. Extra payments reduce principal sooner—our timeline recalculates each month to show the new payoff.

Loan terms explained

  • APR: Annual Percentage Rate includes lender fees and determines how much interest you pay.
  • Term: Longer loans lower monthly payments but increase total interest. Try 60 months or less if possible.
  • Taxes & fees: Usually due at signing; rolling them into the loan increases the balance.

Tips to save on your auto loan

  • Improve your credit score before applying to unlock better APR ranges.
  • Consider a slightly higher down payment to reduce the amount financed.
  • Make a small extra payment each month (even $25) to shave months off the schedule.
  • Compare lender offers online and at local credit unions; bring pre-approval to the dealership.

How It Works

The Auto Loan Calculator runs entirely in your browser using JavaScript. Unlike other tools that send your data to a server, we process everything locally on your device. This guarantees 100% privacy and blazing fast speed.

  • No server interaction – data never leaves your device
  • Instant results since there is no network latency
  • Works offline once the page is loaded
  • Free to use with no usage limits

How to Use

1

Enter deal details

Add vehicle price, trade-in, down payment, taxes, and any dealer fees.

2

Adjust term & rate

Use the sliders or credit profile presets to estimate your APR and loan length.

3

Review payoffs

See the monthly payment, payoff date, total interest, and how extra payments save money.

Example Usage

Use this auto loan calculator to preview the payment plan before you visit the dealership.

Input
Vehicle price: $38,000 Down payment: $5,000 Interest rate: 6.2% Term: 60 months Roll taxes/fees into loan
Output
Monthly payment ≈ $643 Total interest ≈ $4,580 Payoff in 56 months if you add a $50 extra payment

Frequently Asked Questions

Does this calculator include taxes and fees?
Yes. Enter your sales tax percentage and any dealer/title fees. Choose whether they are rolled into the loan or paid upfront.
How accurate are the interest calculations?
We use the standard amortization formula. For extra payments, we recalculate each month to simulate how your balance would really fall.
Can I see how bi-weekly or extra payments help?
Yes. Add an optional “extra monthly payment” to see how many months and how much interest you can save versus the base schedule.

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The Auto Loan Calculator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.