# Blue Book: What it is, How it Works, Effect

> **Definition**
>
> The Blue Book, or Kelley Blue Book, is a comprehensive guide that provides estimated market prices for new and used vehicles, helping buyers and sellers determine fair purchase prices.

## What Is a Blue Book?

The Blue Book or [Kelley Blue Book](https://www.investopedia.com/articles/personal-finance/113015/are-kelley-blue-book-values-accurate-and-reliable.asp) is a guidebook that compiles and quotes prices for new and used automobiles and other vehicles of all makes, models, and types. First published in 1926 by Los Angeles car dealer Les Kelley, the Blue Book was originally only available to those in the automotive industry, but both a consumer edition and an online edition was made available in the 1990s for the general public. The Blue Book provides a [fair market range](https://www.investopedia.com/terms/f/fairmarketvalue.asp) reflecting an estimated range of prices car buyers will pay for a specific car based on make, model, style, and year.

### Key Takeaways

*   The Blue Book, also known as the Kelley Blue Book, is a popular and trusted guide for automotive price quotes in North America.
*   Blue Books show car buyers and sellers what prices others have paid to acquire vehicles of the same make, model, year, and comparable mileage and use.
*   The Blue Book analyzes the private party value, trade-in value, suggested retail value, certified pre-owned (CPO) value, and many other prices for used cars.
*   Blue Books can also help car buyers determine the potential future costs of car ownership, such as the costs of fuel, maintenance, repairs, and insurance.

## Understanding the Blue Book

Blue Book has become the premier appraisal guide for vehicle price quotes in North America. Car sellers and car buyers will consult the Blue Book to determine the [resale value of used cars](https://www.investopedia.com/budgeting-4689726). Kelley Blue Book also provides an actual cash value for vehicles. This can be used to check your insurance company's valuation should you get in a wreck, and potentially negotiate with them.

The Blue Book analyzes the private party value, trade-in value, suggested retail value, and certified pre-owned (CPO) value for used cars. The new car Blue Book shows what consumers are currently paying for new cars.

> **Fast Fact**
>
> Over the decades, Blue Book pricing guides have been published for a variety of markets—including guides for motorcycles, travel trailers, campers, ATVs, snowmobiles, and manufactured housing.

## How Blue Books Are Used

Blue Books show buyers and sellers of automobiles what prices others have paid—the so-called fair purchase price—to acquire vehicles of the same make, model, year, and comparable mileage and use. Furthermore, Blue Books can detail the anticipated costs associated with a vehicle such as fuel, maintenance, repairs, insurance, and financing, along with the anticipated [depreciation](https://www.investopedia.com/terms/d/depreciation.asp) of its value over time. That way, buyers can see the potential cost to own the vehicle five years out from the date it is acquired.

## How the Blue Book Determines Car Prices

The fair purchase price listed in the Blue Book is established to show the price other consumers typically pay for the same vehicle. These prices are adjusted based on the region where the transactions take place from new-vehicle purchases that occur across the country. The prices are adjusted on a recurring basis to account for changes in market conditions.

The Blue Book does not show the lowest prices paid in the market for vehicles, but rather the going price that a vehicle currently sells for. The prices in the Blue Book are set by gathering data on thousands of consumer vehicle purchase prices. This is coupled with data taken from national vehicle registration databases. Kelley Blue Book reviews the aggregate information each week. The company uses a proprietary [algorithm](https://www.investopedia.com/terms/a/algorithm.asp) to analyze pricing data, historical trends, location, time of year, and economic conditions to come up with the value ranges it compiles in the Blue Book.

## Special Considerations

Originated by the Kelley Blue Book Company, which was acquired by AutoTrader.com and Cox Automotive, the guidebook is not to be confused with other titles referred to as “blue books,” such as the Social Security Blue Book that lists disabling impairments.

In addition to the Blue Book, there are several other resources car buyers and sellers can consult to research car pricing. J.D. Power and Consumer Reports both offer consumers a variety of resources, including data on new car prices, used car book value, and vehicle history reports. For those planning to rely on a loan for financing a vehicle purchase, an [auto loan calculator](https://www.investopedia.com/car-loan-calculator-5084761) is another tool worth adding to their arsenal.

> **Article Sources**
>
> 1.  Kelley Blue Book. "[History](https://www.kbb.com/company/history/)."
>     
> 2.  Kelley Blue Book. "[Frequently Asked Questions, New Car](https://www.kbb.com/faq/new-cars/)."