NADAguides vs Carfax Values

NADAguides (National Appraisal Guides) and Carfax Values have both developed proprietary processes to accurately value vehicles in an effort to better educate and inform the auto marketplace. These companies serve an important role by helping set pricing standards across dozens of used vehicle makes and models. By providing accurate pricing information based on proprietary methods both NADAguides and Carfax Values are able to transparently assist both buyers and sellers who are in pursuit of reliable pricing information.

National Appraisal Guides (NADAguides)

When we attempt to value a used vehicle we use a number of data points. These data points include, but are not limited to, actual wholesale transactions (around 80% of the market with our relationship with NAAA) and retail transactions (through our relationship with J.D. Power and their PIN data which is obtained their actual Dealer Management Systems), as well as asking price information from www.autotrader.com. In addition, we have data from various OEMs and wholesalers and retailers of used vehicles that provide us the amounts for which they paid and sold their vehicles. We also take into consideration MSRP, invoice, equipment assumptions, as well as supply and demand and other macro- and micro-economic factors and the competitive landscape of vehicles. Our retail value is what a person could reasonably pay for a vehicle at a dealer’s lot. Our values are designed and intended to assist users in performing their own valuation of a particular used vehicle. The process by which users of NADAguides determine valuation is inherently subjective. Individual vehicles may have an actual value that is higher or lower than the estimated values created by us.


NADA has been around for over 80 years and is the premier valuation guide in the used vehicle industry. Customers include, but are not limited to: dealers, wholesalers, rental car companies, insurance companies, lending institutions, OEMs, government agencies, as well as individual consumers. We attempt to create the most accurate, market-reflective, unbiased vehicle values and we believe we do so each and every time one of our products is presented to the outside world.


NADAguides is additionally known as a credible source for pricing outside of the automobile industry. Comprehensive pricing data is also published for powersports, recreational vehicles, boats and manufactured housing.

Carfax Values

Like NADAguides, Carfax Values considers attributes like miles, condition, location, make and model, trim, and options to accurately determine a car’s value. Where Carfax Values differs is that they provide a vehicle specific value based on each vehicle’s unique vehicle identification number (VIN). This is referred to as a Carfax History-Based Value.

By analyzing information contained in a vehicle’s history report a Carfax History-Based Value is able to determine a valuation specific to each vehicle. Factors included in the history report that are considered when determining a valuation include accident history, maintenance records, service history, number of previous owners, open recalls, and whether a vehicle was for personal, business, or fleet use. These vehicle specific variable help determine an exact value that a marketplace analyzation alone cannot provide.

By looking at a vehicle’s unique history report Carfax Values is able to weight values between similar make/model/year vehicles for variations like oil change frequency and if any recalls or accidents were properly attended to. A car that has been in a minor accident but has been properly restored may provide more value to buyer. Whereas, a car that is lacking frequent oil change records may provide less value. These considerations can only be determined by examining an individual vehicle’s history report and play an uniquely important role in Carfax’s valuation process.

The vehicle specific Carfax History-Based Value eliminates the guesswork that both buyers and sellers face when confronted with a more vague suggested retail value that leave many pricing variables unconsidered.