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Auto Loan Calculator

Estimate monthly car payments, amount financed, total interest, tax, fees, and amortization.

  • car loan
  • vehicle loan
  • monthly car payment

Optional percentage applied to the vehicle price.

Optional registration, documentation, or lender fees.

Optional extra principal payment used to estimate faster payoff and interest savings.

Status: initial

Results

Awaiting calculation

Explore your result

Financed vehicle cost

Explore the auto loan calculator result visually while keeping this page's detailed guidance and examples.

$35,400.00Total

Financed vehicle cost

Financed amount
$29,000.00
Interest
$4,400.00
Fees
$2,000.00

Use this result well

  1. 1Verify the calculator inputs.
  2. 2Compare the key result relationships.
  3. 3Review the page guidance before acting.

A longer term can hide higher cost and negative-equity risk.

Calculator guide

Introduction

An auto loan calculator estimates monthly vehicle payments from price, down payment, trade-in value, interest rate, term, tax, and fees. It also helps compare loan terms and estimate how extra monthly payments may reduce payoff time and interest.

What is an auto loan?

An auto loan is a fixed-term loan used to finance a vehicle purchase. Most auto loans are amortizing loans, which means each monthly payment covers interest and reduces principal.

Auto loan formula

The calculator first estimates the amount financed, then applies the standard amortizing loan formula. Sales tax and fees can be included as optional assumptions. Extra payment and term comparison outputs are planning scenarios, not separate lender offers.

Variable explanations

Understand what each input and result means before calculating.

Vehicle price

The negotiated purchase price before tax, fees, and credits.

Down payment

Cash paid upfront to reduce the amount financed.

Trade-in value

Vehicle credit applied to reduce the financed balance.

Interest rate

The annual borrowing rate used to calculate monthly interest.

Loan term

The repayment length in months, from 1 to 120 months.

Tax and fees

Optional assumptions for sales tax, registration, and lender fees.

Extra monthly payment

Optional extra amount assumed to reduce principal faster.

Loan-to-value

A planning ratio comparing amount financed with vehicle price.

Reviewed by the Calculator.org.in Editorial Team

Formula behavior, validation cases, explanatory examples, and cited sources are checked before publication. This review supports educational accuracy and is not a substitute for qualified professional advice.

Last reviewed: 2026-08-02

Review process

Formula guide

See the calculation logic, variable definitions, and practical meaning.

Monthly auto loan payment

Payment = P x r x (1 + r)^n / ((1 + r)^n - 1)

  • P is amount financed.
  • r is monthly interest rate.
  • n is number of monthly payments.

This calculates the fixed monthly payment for an amortizing vehicle loan.

Zero-interest auto loan

Payment = P / n

  • P is amount financed.
  • n is number of monthly payments.

When the interest rate is 0%, the payment is the financed amount divided by months.

Amount financed

Amount Financed = Vehicle Price + Sales Tax + Fees - Down Payment - Trade-in

  • Sales tax is calculated from vehicle price.
  • Fees are optional entered costs.

This is the balance used in the monthly payment formula.

Total cost

Total Cost = Total Repayment + Down Payment + Trade-in

  • Total repayment includes financed principal and interest.

This gives a broader view of the purchase cost across cash and financed amounts.

Extra payment payoff

New payoff = scheduled payment + extra monthly principal payment until balance reaches zero

  • Extra payment is assumed to go toward principal.
  • Actual lender rules and prepayment policies can vary.

This estimates payoff months saved and interest saved from paying extra.

Loan-to-value estimate

Loan-to-value = amount financed / vehicle price x 100

  • Amount financed includes entered tax and fees if rolled into the loan.

This helps compare the financed balance with the vehicle price before lender-specific valuation rules.

Worked examples

Follow realistic inputs through the calculation step by step.

1

Worked example

New car purchase

  1. 1Vehicle price is 35,000.
  2. 2Down payment is 5,000 and trade-in is 3,000.
  3. 3Sales tax is 6% and fees are 800.
  4. 4At 7% for 60 months, the monthly payment is about 592.
2

Worked example

Used car purchase

  1. 1Vehicle price is 18,000.
  2. 2Down payment is 2,500.
  3. 3There is no trade-in credit.
  4. 4The financed amount is reduced by the cash paid upfront.
3

Worked example

Zero-interest promotion

  1. 1Amount financed is 24,000.
  2. 2Loan term is 48 months.
  3. 3Interest rate is 0%.
  4. 4Monthly payment is 500.
4

Worked example

Tax and fees effect

  1. 1Sales tax and fees increase the amount financed when rolled into the loan.
  2. 2A higher financed amount increases monthly payment.
  3. 3Paying fees upfront can reduce the loan balance.
  4. 4Actual dealer and state fees vary by location.
5

Worked example

Extra payment scenario

  1. 1Enter the scheduled loan details.
  2. 2Add an extra monthly payment amount.
  3. 3Compare payoff months and estimated interest savings.
6

Worked example

Term comparison

  1. 1Review 36, 48, 60, and 72 month rows.
  2. 2Shorter terms usually raise monthly payment but reduce interest.
  3. 3Longer terms usually lower monthly payment but increase total interest.

Common mistakes

Avoid these common input and interpretation errors.

Ignoring the out-the-door cost

Vehicle price alone may not include tax, title, registration, documentation fees, or lender fees.

Only comparing monthly payments

A longer term can lower the payment but increase total interest.

Overestimating trade-in value

Use a conservative trade-in estimate until the dealer or buyer confirms the value.

Forgetting negative equity

This release handles trade-in credit, not negative equity payoff. Add that separately as a fee if needed.

Treating estimates as approvals

Actual loan offers depend on lender underwriting, credit profile, taxes, fees, and dealer terms.

Assuming extra payments are always applied automatically

Some lenders require instructions to apply extra payments to principal. Check your loan agreement.

Comparing APR without checking term length

A lower payment can still cost more if the loan term is much longer.

Frequently asked questions

Quick answers to the questions users ask most often.

How is an auto loan payment calculated?
It uses the amortizing loan formula with amount financed, monthly interest rate, and number of payments.
What is amount financed?
Amount financed is vehicle price plus entered sales tax and fees, minus down payment and trade-in value.
Does the calculator include sales tax?
Yes, if you enter a sales tax rate. Leave it blank or 0 to exclude sales tax.
Does it include fees?
Yes, enter optional fees if you want them included in the amount financed.
Can trade-in value exceed vehicle price?
No. Trade-in value cannot exceed vehicle price in this calculator.
Can down payment exceed vehicle price?
No. Down payment cannot exceed vehicle price.
What happens at 0% interest?
The payment is amount financed divided by the number of months.
What loan terms are supported?
The calculator supports terms from 1 to 120 months.
What is total repayment?
Total repayment is the sum of scheduled monthly loan payments.
What is total interest?
Total interest is total repayment minus the amount financed.
What does loan-to-value mean here?
It is amount financed divided by vehicle price. It is a planning estimate and may differ from a lender's official valuation.
What is interest as percent of loan?
It shows total interest compared with the amount financed, which helps compare offers with different terms.
Does paying extra each month save interest?
Usually yes if the extra amount is applied to principal. The calculator estimates payoff months saved and interest saved.
Does the extra payment estimate include prepayment penalties?
No. It assumes extra payments are allowed and applied to principal. Check your lender's rules.
Why compare 36, 48, 60, and 72 month terms?
These are common auto loan planning terms and they show the tradeoff between monthly payment and total interest.
What is total cost?
Total cost combines total repayment with upfront down payment and trade-in value for a broader purchase view.
Does this calculate insurance?
No. Auto insurance is not included because it is separate from the loan payment.
Does this include negative equity?
No. If you need to model negative equity, add the payoff amount as an optional fee for now.
Is this the same as a loan calculator?
It uses the same amortizing loan concept, but adds vehicle-specific inputs such as trade-in, sales tax, and fees.
Is this a loan offer?
No. It is an educational estimate and not a lender quote or financing approval.

References

Sources used to support the calculator guidance.

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Version history

A transparent record of calculator content updates.

Updated 2026-08-02
  • 1.1.0 · 2026-08-02

    Added extra payment payoff scenario, interest savings, loan-to-value estimate, interest share, and term comparison guidance.

  • 1.0.0 · 2026-07-04

    Initial production release with monthly payment, tax, fees, trade-in, and amortization summary.