Cal11 calculator
Search calculator...

Auto Buy Calculator

Reviewed by Calculator Editorial Team

Use this auto buy calculator to estimate your vehicle purchase costs. Simply enter the vehicle price, down payment, interest rate, and loan term to calculate your monthly payments, total interest, and total cost of ownership.

How to Use This Calculator

To use the auto buy calculator:

  1. Enter the purchase price of the vehicle in the "Vehicle Price" field.
  2. Enter your down payment amount in the "Down Payment" field.
  3. Enter the loan interest rate in the "Interest Rate" field.
  4. Select the loan term in years from the dropdown menu.
  5. Click the "Calculate" button to see your estimated monthly payment, total interest, and total cost.

The calculator will display your estimated monthly payment, total interest paid over the life of the loan, and the total cost of the vehicle including interest.

Formula Used

The auto loan calculator uses the standard auto loan payment formula:

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

Where:

  • P = Loan amount (Vehicle Price - Down Payment)
  • r = Monthly interest rate (Annual Rate / 12 / 100)
  • n = Number of payments (Loan Term in Years × 12)

Total interest is calculated by multiplying the monthly payment by the number of payments and subtracting the loan amount.

Total cost is the sum of the loan amount and total interest.

Worked Example

Let's calculate the monthly payment for a $25,000 vehicle with a $5,000 down payment, 4.5% annual interest rate, and 5-year loan term.

  1. Loan amount = $25,000 - $5,000 = $20,000
  2. Monthly interest rate = 4.5% / 12 / 100 = 0.00375
  3. Number of payments = 5 × 12 = 60
  4. Monthly payment = $20,000 × (0.00375(1 + 0.00375)^60) / ((1 + 0.00375)^60 - 1) ≈ $386.64
  5. Total interest = ($386.64 × 60) - $20,000 ≈ $1,194.40
  6. Total cost = $20,000 + $1,194.40 ≈ $21,194.40

Using the calculator with these values will give you these results.

Frequently Asked Questions

What is included in the total cost?
The total cost includes the original loan amount plus the total interest paid over the life of the loan.
Can I use this calculator for leases?
No, this calculator is designed for traditional auto loans. For lease calculations, you would need a different calculator.
How accurate is this calculator?
This calculator provides an estimate based on the information you provide. Actual payments may vary slightly due to rounding and other factors.
What if I want to refinance?
You can use this calculator to estimate your current payments and then compare with potential refinancing terms.