Auto Loan Calculator

Estimate vehicle financing costs including total interest burden and precise monthly car payments.

Share:
$
$
%
Monthly Payment
$0
Financed Principal Amount
$0
Total Interest Over Loan
$0
Formula / Calculation
Monthly Pmt = P × [r(1+r)^n] / [(1+r)^n - 1]

Avoiding the Dealership Trap

When purchasing a vehicle, dealerships will almost always focus negotiation strictly on the "monthly payment." This is a mathematical trap designed to abstract away the true cost of the vehicle and the massive interest burden. By stretching a loan to 72 or 84 months, dealers can lower the monthly payment while ensuring you pay thousands more in total interest.

Car Loan Fundamentals

The Principal Balance

The actual amount of money you are borrowing. This is the out-the-door car price minus your down payment and any trade-in equity.

Loan Terms (Duration)

While 48 or 60 months used to be standard, 72 and 84-month terms are now common. Longer terms mean vastly higher lifetime interest and guarantee you will be "underwater" (owing more than the car is worth).

Amortization on Depreciating Assets

Unlike a house which usually appreciates, a car loses value the second you drive it away. If your loan balance drops slower than the car's value depreciates, you are functionally trapped in the loan.

Intelligent Car Buying Rules

Never negotiate on the monthly payment. Negotiate strictly on the Out-The-Door total price.
Secure financing from a local credit union BEFORE stepping foot onto a dealer lot.
Follow the 20/4/10 Rule: Put 20% down, finance for no longer than 4 years, and ensure total car expenses don't exceed 10% of gross income.
If you are offered 0% APR, read the fine print; you often forfeit massive cash rebates in exchange for the zero rate.

Frequently Asked Questions

What is gap insurance?
Guaranteed Asset Protection insurance covers the difference between what your car is worth and what you owe on your loan if the car gets totaled. It is heavily recommended if you put very little money down.