Car Loan Calculator

The auto loan payment formula uses the same amortization calculation as a mortgage, M = P[r(1+r)^n]/[(1+r)^n-1], applied to the net vehicle price after subtracting any down payment and trade-in value. Enter your vehicle details below to see estimated monthly payments and total interest costs.

Quick Answer

A $30,000 vehicle with $5,000 down at 6% interest for 60 months has an estimated monthly payment of approximately $483. Total interest paid over the loan is approximately $3,975.

Common Examples

Input Result
$25,000 car, $3,000 down, 5% for 48 months Estimated $507/month
$30,000 car, $5,000 down, 6% for 60 months Estimated $483/month
$40,000 car, $10,000 down, 7% for 72 months Estimated $513/month
$20,000 car, $0 down, 4.5% for 36 months Estimated $595/month

How It Works

This calculator uses the standard amortization formula to estimate fixed-rate auto loan payments:

M = P x [r(1 + r)^n] / [(1 + r)^n - 1]

Where:

  • M = estimated monthly payment
  • P = principal (vehicle price minus down payment minus trade-in value)
  • r = monthly interest rate (annual rate / 12 / 100)
  • n = loan term in months

The estimated total paid is M x n, and the estimated total interest is the total paid minus the principal.

For a 0% interest rate, the estimated monthly payment is simply the principal divided by the number of months.

Worked Example

For a $30,000 vehicle with $5,000 down payment and no trade-in at 6% for 60 months: Loan amount P = $25,000. Monthly rate r = 0.06/12 = 0.005. Number of payments n = 60. M = 25000 x [0.005(1.005)^60] / [(1.005)^60 - 1] = 25000 x [0.006744] / [0.3489] ≈ $483.32 per month. Total paid = $28,999, with approximately $3,999 in interest.

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Frequently Asked Questions

How is the monthly car payment estimated?
The calculator uses the standard amortization formula. The principal is calculated as the vehicle price minus any down payment and trade-in value. That principal, combined with the annual interest rate and loan term, determines the estimated fixed monthly payment.
What is a typical auto loan interest rate?
Rates vary based on credit score, lender, and whether the car is new or used. As of 2024-2025, new car rates typically range from 4% to 9%. This calculator works with any rate you provide.
Does this include taxes and fees?
No. This estimates the loan payment only. Tax, title, registration, and dealer fees are additional costs that vary by state and dealer.
Should I choose a shorter or longer loan term?
Shorter terms have higher monthly payments but lower total interest. Longer terms reduce monthly payments but increase total interest paid. This calculator helps illustrate both scenarios.

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