Car Affordability Calculator: How Much Car Can I Afford?

NerdWallet suggests spending no more than 10% of your take-home pay on a car loan payment and no more than 20% for total car expenses — which also includes things like gas, insurance, repairs and maintenance.

Knowing what monthly car payment you can afford can help you calculate how much you can afford to borrow for your car loan. Use our car affordability calculator to help you set a realistic budget.

How to use the car affordability calculator

Most car payment calculators start with the total loan amount you want and other inputs to see what your monthly payment would be. NerdWallet’s car affordability calculator starts with the monthly payment you choose and shows you what loan amount you can afford, and how the APR and loan term change the total loan amount.

To use NerdWallet’s car affordability calculator, input the monthly car payment you’ve decided you can afford and the length of loan you want. Then select “new” or “used” and your credit tier. (You can check your credit score for free, if you don’t already know it.)

NerdWallet estimates an APR based on the average APR for new or used car loans in that credit tier using data from Experian Information Solutions. You can try different loan terms and adjust the inputs to further customize your loan amount.

» MORE: Compare auto loans, rates and lenders.

How to determine how much car you can afford

Calculating how much car you can afford before you visit the dealership can save you hundreds, maybe thousands, of dollars in the long run.

Here are three key steps to follow:

1. Calculate the car payment you can afford

You may wonder, “How much car can I afford based on salary?” Instead, you’ll want to base it off your take-home pay — the amount you make each month after taxes — to get a more accurate picture of your finances.

NerdWallet recommends spending no more than 10% of your take-home pay on your monthly auto loan payment. So if your after-tax pay each month is $3,000, you could afford a $300 car payment.

Be realistic about how long you can or want to be making this monthly payment. The new-car excitement will wear off in a few months; soon, you'll look at that vehicle the same way you do at the one currently in your driveway. NerdWallet recommends maximum loan terms of 36 months for buying a used car and 60 months for new cars.

Taking a longer loan term will reduce your monthly payment, but over time you’ll pay much more in interest. Also, a longer loan term increases your risk of becoming upside-down on the loan, meaning you owe more than the car is worth.

2. Calculate the car loan amount you can afford

Now that you’ve calculated your affordable monthly car payment amount, you can get a sense of how much you can borrow. This will depend on several other factors, including:

• Your credit score, which will in part determine your annual percentage rate, or APR, on the loan.

• Your loan term, or the number of months you have to pay off the loan.

• Whether you buy new or used. New car loans tend to have lower APRs.

With a monthly payment, an estimated APR and loan term, the car affordability calculator works backward to determine the total loan amount you can afford.

3. Set a target purchase price

The total loan amount you can afford isn’t necessarily the price of the car you can afford. If you’re making a down payment or trading in your old car, you’ll be able to buy a higher-priced car, or borrow less money. (Use our auto loan calculator to see how your down payment or trade-in credit affects your monthly payment and loan amount.)

Once you estimate the car loan amount you can afford, and assuming no trade-in credit or down payment, you can begin to get a realistic idea of the purchase price you should consider. In the current shortage-driven market, expect to pay a market adjustment — extra profit tacked right onto the sticker price — on many popular models.

Don’t forget: To get your total car price, you’ll need to factor in sales tax and fees, which vary by state, in addition to the advertised cost of the car. A simple way to estimate these extra expenses is to add 10% to the advertised price of the car (even though you might negotiate a lower price). For example, if you see a car advertised for $20,000, assume your total cost — the “out the door” price — will be $22,000.

To get a more precise estimate, here’s a breakdown of the typical extra costs:

• Sales tax: Typically 5% to 10%, and may include state, county and local taxes.

• Registration fees: Estimate these fees by using your state’s department of motor vehicles site.

• Documentation fee: Typically ranges from $75 to $895, depending on your state.