How to Tell if a Used Car Is a Good Deal: Comps vs. KBB vs. Asking Price
How to tell if a used car is a good deal: which Kelley Blue Book value to use, how to pull local comparable listings, adjust for condition, and calculate a real discount.
An asking price on its own tells you almost nothing. A $9,000 Civic can be a steal or a ripoff depending on its year, miles, trim, title, and what similar Civics near you are selling for.
To know whether a used car is a good deal, compare it against three things: a pricing guide, real comparable listings in your area, and the car’s actual condition. This guide shows how to use each one, and how to combine them into a single number you can act on.
Step 1: Use the right pricing-guide value
Pricing guides like Kelley Blue Book, Edmunds, and J.D. Power give several values for the same car. Using the wrong one is the most common pricing mistake.
Here’s how Kelley Blue Book defines its main values:
| Value | What it means | When to use it |
|---|---|---|
| Trade-in value | What a dealer would typically offer you for the car as a trade-in | A rough floor. A private seller asking close to trade-in is pricing low. |
| Private Party Value | What a buyer can expect to pay a private seller, as is, with no warranty | Your main benchmark for Marketplace, Craigslist, and other private sales |
| Fair Purchase Price | What buyers in your area typically pay a dealer this week for a car with typical miles and options | Use for dealer listings, not private sales |
Dealer prices are usually higher than private-party prices, partly because dealers recondition cars and may offer warranties. If you compare a private-party listing against a dealer price, almost everything looks like a deal.
When you enter the car into a pricing guide, be honest about condition. Most used cars aren’t “excellent.” Choosing a better condition than the car deserves inflates the value and makes a fair price look like a bargain.
Step 2: Pull real comparable listings
Pricing guides are national models adjusted for your area. Comparable listings (“comps”) show what’s actually happening in your local market right now, which is often more useful.
To pull good comps:
- Match the model and trim. An EX and an LX of the same car can be priced very differently.
- Stay within a year or two. Use the same model year if there are enough listings, and widen slowly if there aren’t.
- Stay within a mileage band. About 20,000 miles either side is a reasonable starting point.
- Match the title status. Never compare a rebuilt or salvage title against clean-title cars.
- Stay local. Use the area you’d buy and sell in, because prices vary by region.
Aim for at least five to ten comps, then use the median asking price rather than the average. A single overpriced or underpriced listing can drag an average far off.
Keep in mind that asking prices aren’t sale prices. Listings that have been up for weeks are probably priced too high. Listings that disappear within a day were probably priced well. Giving more weight to fast-selling listings brings you closer to real market value.
For context, the average used vehicle listed at U.S. dealers was priced at $27,239 in August 2026, according to Cox Automotive, with about 44 days of supply. National averages aren’t useful for pricing one car, but they show why local, model-specific comps matter.
Flipify Motors shows comparable listings and a deal score alongside a matching car when enough comps are available, which saves you from building this list by hand for every lead.
Step 3: Adjust for condition and reconditioning
Two cars with identical specs aren’t worth the same if one needs $1,500 of work. Before comparing a car to comps, subtract what it will cost to bring it up to the condition of a typical comparable listing:
- Tires, brakes, and fluids
- Warning lights and known mechanical issues the seller mentions
- Body damage, interior wear, and cleaning
- Missing items like a second key or the owner’s manual
A car listed $1,000 under market that needs $1,500 of work isn’t a deal. It’s $500 overpriced.
Step 4: Check the history before you trust the price
Some cars are cheap for a reason the listing doesn’t mention. Before you get attached, check:
- Title and brand history. The U.S. Department of Justice’s National Motor Vehicle Title Information System (NMVTIS) lets you check a car’s title, brand history (like salvage, flood, or rebuilt), and latest odometer reading through approved providers for a small fee.
- Open recalls. Enter the VIN at NHTSA’s recall lookup. Recall repairs are free at a dealer, but you should know about them.
- Accident and service history. A commercial history report can show reported accidents and maintenance records.
- The title in person. The name on the title should match the seller’s ID, and the VIN should match the car.
Step 5: Calculate your real discount
Now you can turn all of this into one number:
Discount = Market value − (Asking price + Reconditioning costs)
where market value is the median of your comps, cross-checked against the pricing guide’s private-party value.
Worked example
Say you find a 2017 Toyota Camry SE with 98,000 miles, listed for $12,500 by a private seller.
| Item | Amount |
|---|---|
| Median of 8 local comps (2016 to 2018 Camry SE, 80,000 to 120,000 miles) | $14,900 |
| Pricing guide private-party value (good condition) | $14,600 |
| Market value used (the lower of the two) | $14,600 |
| Asking price | $12,500 |
| New tires and a detail | $750 |
| Real discount | $1,350 (about 9% below market) |
That’s a solid deal for a daily driver. For a flip, you’d also need to subtract fees, taxes, and holding costs, as explained in our guide to flipping cars for profit.
How much below market is a good deal?
There’s no universal number, but these rough guides help:
- Buying a car for yourself: Anything at or slightly below market value for a well-maintained car with a clean history is a good purchase. Paying a little more for a car with strong service records is often worth it.
- Buying to flip: You generally need a meaningful gap, often 15% or more below market for cheaper cars, to cover reconditioning, fees, and risk and still make a profit.
- Far below market: If a car is priced 30% or more below comparable listings and nothing explains why, be careful. It may have a hidden problem, a title issue, or be a scam.
Red flags that a “deal” isn’t one
- The seller won’t share the VIN or let you see the title.
- The title is branded, missing, or not in the seller’s name.
- The car’s mileage seems inconsistent with its wear or history records.
- The seller pressures you for a deposit before you’ve seen the car.
- The price is far below every comparable listing for a popular, desirable model.
Frequently asked questions
Is Kelley Blue Book accurate for private sales?
It’s a useful starting point. Use the Private Party Value, not the Fair Purchase Price, which is designed for dealer purchases. Then check it against local comparable listings, which reflect your market more directly.
What’s the difference between Fair Purchase Price and Private Party Value?
Fair Purchase Price is what buyers typically pay a dealer for a used car. Private Party Value is what you can expect to pay an individual seller, with the car sold as is and no warranty. Private party prices are usually lower.
How many comparable listings do I need?
Five to ten close matches are usually enough to see a pattern. If you can’t find that many, widen the year range or mileage band slowly, and lean more on the pricing guide.
Should I use asking prices or sold prices?
Sold prices are better, but they’re hard to get for private sales. Use asking prices, and give more weight to listings that sold quickly than to listings that have sat for weeks.
See the price in context, automatically
Pricing every lead by hand takes time, and good cars don’t wait. Flipify Motors alerts you when a matching car is listed and shows comparable listings next to it when they’re available.
Set up a watchlist in Flipify Motors and size up your next deal in seconds.
