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Car Affordability Calculator
Start from your monthly budget and see the car price you can realistically afford, after down payment, interest, tax and running costs. Enter your numbers and press Calculate.
Written by TopicDrill Editorial Team·Updated June 2026
Where your money goes
Down payment & trade-in$3,000
Amount financed$15,151
Interest over loan$2,849
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How the car affordability calculator works
Instead of guessing a price and checking the payment, this tool works backward. It takes the monthly amount you can spend, removes insurance and other running costs, and treats what is left as your loan payment. From that payment, your rate and your term, it solves for the largest loan, and therefore the largest car price, you can support.
Your down payment and trade-in are added on top of the loan, so they raise the price you can afford without raising the monthly payment. Sales tax is then backed out to show the price before tax, which is the number you actually negotiate at the dealer.
A quick example
Suppose you can spend $500 a month, with $120 going to insurance and $80 to fuel and upkeep. That leaves $300 for the loan. At 7% over 60 months, $300 a month supports about $15,100 in financing. Add a $3,000 down payment and you can afford roughly an $18,000 car, or about $17,000 before a 6% sales tax.
Things to keep in mind
These are estimates. Your real rate depends on credit and lender, and dealer fees can change the math. For unbiased guidance on auto loans, see the Consumer Financial Protection Bureau. You can also compare financing with our other free calculators.
Frequently asked questions
How much car can I afford?
Start from the total monthly amount you can comfortably spend on a car, then subtract insurance, fuel and maintenance. Whatever is left is your loan payment, which this calculator turns into a maximum car price using your rate and term.
What is the 20/4/10 rule?
A common guideline is to put at least 20% down, finance for no more than 4 years, and keep total transportation costs under 10% of your gross income. It helps avoid being upside down on the loan and keeps payments manageable.
Should I include insurance and fuel in my budget?
Yes. The sticker price is only part of the cost. Insurance, fuel, maintenance and registration add up every month. This calculator subtracts those running costs first so the loan payment, and the price it supports, are realistic.
Does a longer loan let me afford more car?
A longer term lowers the monthly payment, so it can raise the price you qualify for. But you pay more interest overall and stay in debt longer, often owing more than the car is worth. Weigh the bigger purchase against the extra cost.
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