What is a Price-To-Book Ratio?

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  • Written By: Renee O'Farrell
  • Edited By: J.T. Gale
  • Last Modified Date: 25 August 2019
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A price-to-book ratio is a measure of value used by financial analysts and investors. It represents the market value of equity in relation to the book value of the equity, and gives an idea whether an investor is paying too much for what would be left if the company went immediately bankrupt. While a price-to-book ratio does not indicate anything about the ability of a firm to generate shareholder profit, it usually serves to indicate whether a stock is overvalued or undervalued.

As with most ratios, the definition of what is a good price-to-book varies by industry. Companies requiring more infrastructure capital, such as a manufacturing company, tend to trade at lower price-to-book ratios than firms requiring less capital, such as a consulting firm. A higher price-to-book ratio typically indicates that investors expect management to create more value from current assets, or that the market value of a firm's assets is significantly higher than the book value.


There are two common ways to calculate price-to-book ratio. The most common way it is calculated is by dividing the market value of equity by the book value of equity. Alternatively, the firm’s market capitalization can be divided by the total book value included on its balance sheet. Price-to-book ratios can also be determined by calculating the differential between the return on equity and the required rate of return on its projects. Regardless of the method used, the price-to-book ratio will be the same; it is presented as a single numeric value, also called a multiple.

A price-to-book ratio or multiple of less than one would imply that the firm’s stocks are priced less than their book values in the market; in other words, the firm is undervalued. Price-to-book ratios less than one are common in the case of economic inflation or when there is a poor-performing market. When a firm is overvalued, the price-to-book ratio will be higher than one. Historically, when the economy and stock markets are strong, firms have traded above a price-to-book ratio of two, indicative of the potential that stocks below their current book value carry.

There is a strong relationship between price-to-book ratios and returns on equity. Firms that have high returns on equity tend to sell above book value while firms with low returns on equity tend to sell at or below book value. Investors usually should pay careful attention to firms that exhibit mismatches of price-to-book ratios and returns on equity, low price-to-book ratios and high return on equity, or vice versa.


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Post 3

@allenJo - Yes, I’ve always looked at PE ratios. Personally, I don’t believe that there is one magic number you should look at.

When I invest in stocks, I use a stock screener, and I apply filters against a whole host of numbers. One of the most important values in my opinion is the debt ratio.

I never like to invest in companies that carry too much debt, regardless of how well they are doing on paper. That’s just me, I guess, because I was burned in the past by investing in telecommunications stocks, which were very capital intensive.

Post 2

@MrMoody - Is market to book the better predictor of a company’s future performance or the price to earnings ratio? I was always taught that PE ratio was the number that you should look at instead.

In terms of PE ratios, a low PE ratio is better. This basically means that for every dollar you invest into the company, it won’t take long for the company to earn back that dollar for you.

During the high flying Internet bubble craze, companies were trading with high PE valuations, like 27 or more. There was no way they were going to sustain those kinds of returns.

Post 1

One of mistakes made by new investors is to look at the share price of a stock to determine if it’s worth investing in that company. They will look for a market to book ratio of less than one, determine that a company is therefore undervalued, and buy that stock.

However this is not always the best thing to do. Personally, I believe that it’s better to buy stocks in companies that are slightly overvalued, as historically they tend to deliver a better return on investments.

Just because a stock is $2 a share doesn’t mean that it is going to go to $4 per share. It may in fact go down, to $1 per share, or less. Do the research and don’t be swayed by stock price.

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