Car Affordability Calculator

Car Affordability Calculator

Find out the maximum vehicle price you can afford based on your monthly budget, down payment, trade-in value, interest rate, and loan term. Instead of starting with a sticker price and hoping the payment works, this calculator works backward from a payment you are comfortable with to reveal your true buying power.

How Car Affordability Is Calculated

The calculator reverses the standard loan payment formula. Given a monthly payment (PMT), rate (r), and term in months (n): Max Loan = PMT x ((1+r)^n - 1) / (r x (1+r)^n). Your maximum vehicle price is then Max Loan + Down Payment + Trade-In Value. This tells you the most expensive car you can purchase without exceeding your budget.

Example

Key Factors That Affect How Much Car You Can Afford

• Monthly budget — the 15% rule suggests keeping total vehicle costs (payment + insurance + fuel) under 15% of gross monthly income
• Interest rate — a 2% rate difference on a $30,000 loan over 60 months costs roughly $1,600 more in interest
• Loan term — longer terms lower payments but increase total interest and risk being upside-down on the loan
• Down payment and trade-in — every extra $1,000 down reduces the loan amount directly, cutting both payments and interest

Tips

1. Get pre-approved by your bank or credit union before visiting a dealer to know your real rate
2. Avoid loan terms longer than 60 months — cars depreciate faster than you pay them down on 72- or 84-month loans
3. Factor in insurance, fuel, and maintenance on top of the payment; budget an additional 30-50% beyond the monthly loan cost
4. Use the trade-in value from an independent source like Kelley Blue Book rather than relying on the dealer’s first offer