Auto Loan Calculator

What is the Auto Loan Calculator?

An auto loan calculator tells you what your monthly car payment will be before you walk into the dealership. That matters because dealers are famous for negotiating in monthly payments rather than total price — which makes it easy to lose track of what the car actually costs. CalciHub's calculator takes the vehicle price, down payment, trade-in value, loan term, and interest rate to give you the monthly payment, total interest, and total cost of the vehicle. Know your number before you negotiate.

How Does It Work?

Auto loans use the same amortization formula as personal loans. Interest is front-loaded, meaning your early payments are mostly interest, with principal paydown accelerating toward the end of the term.

Formula: M = P × [r(1+r)^n] ÷ [(1+r)^n − 1]

M = monthly payment

P = loan amount (vehicle price minus down payment and trade-in)

r = monthly interest rate (annual rate ÷ 12)

n = number of months in the loan term

How to Use CalciHub's Auto Loan Calculator

1. Enter the vehicle price.

2. Enter your down payment amount.

3. Enter any trade-in value (the calculator subtracts it from the price automatically).

4. Enter the loan term in months (36, 48, 60, or 72 months are common).

5. Enter the annual interest rate from your lender or dealer.

6. Click Calculate to see your monthly payment and full loan cost breakdown.

Tip: Get a rate from your bank or credit union before visiting the dealership — dealer financing often carries higher rates, and having a competing offer gives you real negotiating leverage.

A Quick Example

Sarah is buying a used car listed at $24,500. She puts down $4,500 and has no trade-in. Her credit union approved a 60-month loan at 6.4%.

Vehicle price: $24,500

Down payment: $4,500

Loan amount: $20,000

Interest rate: 6.4%

Term: 60 months

Monthly payment: $389.96

Total interest paid: $3,397.60

Total cost of vehicle: $27,897.60

If Sarah stretched to a 72-month term to lower the monthly payment, it drops to $335 — but she'd pay nearly $4,100 in interest and own a depreciating asset for six full years. The 60-month term is the smarter call.

Frequently Asked Questions