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## what is price-to-earnings ratio – p/e ratio?

the price-to-earnings ratio (p/e ratio) is the ratio for valuing a company that measures its current share price relative to its per-share earnings (eps).the price-to-earnings ratio is also sometimes known as theprice multipleor the earningsmultiple.

p/e ratios are used by investors and analysts to determine the relative value of a company”s shares in an apples-to-apples comparison. it can also be used to compare a company against its own historical record or to compare aggregate markets against one another or over time.

the price-earnings ratio (p/e ratio) relates a company”s share price to its earnings per share.a high p/e ratio could mean that a company”s stock is over-valued, or else that investors are expecting high growth rates in the future.companies that have no earnings or that are losing money do not have a p/e ratio since there is nothing to put in the denominator.two kinds of p/e ratios – forward and trailing p/e – are used in practice.

## p/e ratio formula and calculation

analysts and investors review a company”s p/e ratio when they determine if the share price accurately represents the projected earnings per share. the formula and calculation used for this process follow.

p/eratio=marketvaluepershareearningspershare\textp/e ratio = \frac\textmarket value per share\textearnings per sharep/eratio=earningspersharemarketvaluepershare

to determine the p/e value, one simply must divide the current stock price by theearnings per share (eps). the current stock price (p) can be gleaned by plugging a stock’s ticker symbol into any finance website, and although this concrete value reflects what investors must currently pay for a stock, the epsis a slightly more nebulous figure.

eps comes in two main varieties. the first is a metric listed in the fundamentals section of most finance sites; with the notation “p/e (ttm),” where “ttm” is awall streetacronym for “trailing 12 months.” this number signals the company”s performance over the past 12 months. thesecond type of eps is foundin a company”s earnings release, which often provides epsguidance. this is the company”s best-educated guess of what it expects to earn in the future.

sometimes, analysts are interested in long term valuation trends and consider the p/e 10 or p/e 30 measures, which average the past 10 or past 30 years of earnings, respectively. these measures are often used when trying to gauge the overall value of a stock index, such as the s&p 500 since these longer term measures can compensate for changes in the business cycle. the p/e ratio of the s&p 500 has fluctuated from a low of around 6x (in 1949) to over 120x (in 2009). the long-term average p/e for the s&p 500 is around 15x, meaning that the stocks that make up the index collectively command a premium 15 times greater than their weighted average earnings.

## forward price-to-earnings

these two types of eps metrics factor into the most commontypes of p/e ratios:the forward p/e and thetrailing p/e. a third and less common variation uses the sum of the last two actual quarters and the estimates of the next two quarters.

the forward (or leading) p/e usesfuture earnings guidancerather than trailing figures. sometimes called “estimated price to earnings,” this forward-looking indicator is useful for comparing current earnings to future earnings and helps provide a clearer picture of what earnings will look like – without changes and other accounting adjustments.

however, there are inherent problems with the forward p/e metric – namely, companies could underestimate earnings in order to beat the estimate p/e when the next quarter”s earnings are announced. other companies may overstate the estimate and later adjust it going intotheir nextearnings announcement. furthermore, external analysts may also provide estimates, which may diverge from the company estimates, creating confusion.

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## trailing price-to-earnings

the trailing p/e relies on past performance by dividing thecurrent share priceby the total eps earnings over the past 12 months. it”s the most popular p/e metric because it”s the most objective – assuming the company reported earnings accurately. some investors prefer to look at the trailing p/e because they don”t trust another individual’searnings estimates. but the trailing p/e also has its share of shortcomings –namely, a company’s past performance doesn’t signal future behavior.

investors should thuscommit money based on futureearnings power, not the past. the fact that the eps number remains constant, while the stock prices fluctuate, is also a problem. if a major company event drives the stock price significantly higher or lower, the trailing p/e will be less reflective of those changes.

the trailing p/e ratio will change as the price of a company’s stock moves, since earnings are only released each quarter while stocks trade day in and day out. as a result, some investors prefer the forward p/e. if the forward p/e ratio is lower than the trailing p/e ratio, it means analysts are expecting earnings to increase; if the forward p/e is higher than the current p/e ratio, analysts expect a decrease in earnings.

## valuation from p/e

theprice-to-earnings ratioor p/eis one of the most widely-used stock analysis toolsused by investors and analysts for determiningstock valuation. in addition to showing whether acompany”s stock price is overvalued or undervalued, the p/ecan reveal how astock”s valuation compares to its industry group or a benchmark like the s&p 500 index.

in essence, the price-to-earnings ratio indicates the dollar amount an investor can expect to invest in a company in order to receive one dollar of that company’s earnings. this is why the p/e is sometimes referred to as the price multiple because it shows how much investors are willing to pay per dollar of earnings. if a company was currently trading at a p/e multiple of 20x, the interpretation is that an investor is willing to pay $20 for $1 of current earnings.

the p/e ratio helps investors determinethe market value of a stock as compared to thecompany”searnings. in short, the p/eratio shows what the market is willing to pay today for a stock based on its past or futureearnings. a high p/e could mean that a stock”s price is high relative to earnings and possibly overvalued. conversely, a low p/e might indicate that the current stock price is low relative to earnings.

## example of the p/e ratio

as a historical example, let”s calculate the p/e ratio for walmart stores inc. (wmt) as of november 14, 2017, when the company”s stock price closed at $91.09. the company”s profit for the fiscal year ending january 31, 2017, was us$13.64 billion, and its number of shares outstanding was 3.1 billion. its eps can be calculated as $13.64 billion / 3.1 billion = $4.40.

## investor expectations

in general, a high p/e suggests that investors are expecting higher earnings growth in the future compared to companies with a lower p/e. a low p/e can indicate either that a company may currently be undervalued or that the company is doing exceptionally well relative to its past trends. when a company has no earnings or is posting losses, in both cases p/e will be expressed as “n/a.” though it is possible to calculate a negative p/e, this is not the common convention.

the price-to-earnings ratio can also be seen as a means of standardizing the value of one dollar of earnings throughout the stock market. in theory, by taking the median of p/e ratios over a period of several years, one could formulate something of a standardized p/e ratio, which could then be seen as a benchmark and used to indicate whether or not a stock is worth buying.

## p/e vs. earnings yield

the inverse of the p/e ratio is the earnings yield (which can be thought of like the e/p ratio). the earnings yield is thus defined as eps divided by the stock price, expressed as a percentage.

if stock a is trading at $10, and its eps for the past year was 50 cents (ttm), it has a p/e of 20 (i.e., $10 / 50 cents) and an earnings yield of 5% (50 cents / $10). if stock b is trading at $20 and its eps (ttm) was $2, it has a p/e of 10(i.e., $20 / $2) and an earnings yield of 10% ($2 / $20).

the earnings yield as an investment valuation metric is not as widely used as itsp/e ratio reciprocal in stock valuation. earnings yields can be useful when concerned about the rate of return on investment. for equity investors, however, earning periodic investment income may be secondary to growing their investments” values over time. this is why investors may refer to value-based investment metrics such as p/e ratio more often than earnings yield when making stock investments.

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the earnings yield is also useful in producing a metric when a company has zero or negative earnings. since such a case is common among high-tech, high growth, or start-up companies, eps will be negative producing an undefined p/e ratio (sometimes denoted as n/a). if a company has negative earnings, however, it will produce a negative earnings yield, which can be interpreted and used for comparison.

## p/e vs. peg ratio

a p/e ratio, even one calculated using a forwardearnings estimate, don”t always tell you whether or not the p/e is appropriate forthe company”s forecasted growth rate. so, to address this limitation, investorsturn to another ratio calledthepeg ratio.

a variation on the forward p/e ratio is the price-to-earnings-to-growth ratio, or peg. the peg ratio measures the relationship between the price/earnings ratioand earnings growthto provide investors with a more complete story than the p/e on its own.in other words, the peg ratio allows investorsto calculate whether a stock”s priceisovervalued or undervaluedby analyzing bothtoday”searnings and the expectedgrowth rate for the company in the future. the peg ratio is calculated as a company’s trailing price-to-earnings (p/e) ratio divided by the growth rate of its earnings for a specified time period. the peg ratio is used to determine a stock”s value based on trailing earnings while also taking the company”s future earnings growth into account, and is considered to provide a more complete picture than the p/e ratio. for example, a low p/e ratio may suggest that a stock is undervalued and therefore should be bought – but factoring in the company”s growth rate to get its peg ratio can tell a different story. peg ratios can be termed “trailing” if using historic growth rates or “forward” if using projected growth rates.

although earnings growth rates can varyamong different sectors, a stock with apeg of less than 1 is typically considered undervalued since its price is considered to be low compared to the company”sexpectedearnings growth. a peg greater than1 might be considered overvalued since it might indicate the stock price is too highas compared to the company”sexpected earnings growth.

## absolute vs. relative p/e

analysts may also make a distinction between absolute p/e and relative p/e ratios in their analysis.

### absolute p/e

the numerator of this ratio is usually the current stock price, and the denominator may be thetrailing eps(ttm), the estimated eps for the next 12 months (forward p/e) or a mix of the trailing eps of the last two quarters and the forward p/e for the next two quarters. when distinguishing absolute p/e from relative p/e, it is important to remember that absolute p/e represents the p/e of the current time period. for example, if the price of the stock today is $100, and the ttm earnings are $2 per share, the p/e is 50 ($100/$2).

### relative p/e

the relative p/e compares the current absolute p/e to a benchmark or a range of past p/es over a relevant time period, such as the past 10 years. the relative p/e shows what portion or percentage of the past p/es the current p/e has reached. the relative p/e usually compares the current p/e value to the highest value of the range, but investors might also compare the current p/e to the bottom side of the range, measuring how close the current p/e is to the historic low.

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the relative p/e will have a value below 100% if the current p/e is lower than the past value (whether the past high or low). if the relative p/e measure is 100% or more, this tells investors that the current p/e has reached or surpassed the past value.

## limitations of using the p/e ratio

like any other fundamental designed to inform investors on whether or not a stock is worth buying, the price-to-earnings ratio comes with a few important limitations that are important to take into account, as investors may often be led to believe that there is one single metric that will provide complete insight into an investment decision, which is virtually never the case. companies that aren”t profitable, and consequently have no earnings—or negative earnings per share, pose a challenge when it comes to calculating their p/e. opinions vary on how to deal with this. some say there is a negative p/e, others assign a p/e of 0, while most just say the p/e doesn”t exist (not available—n/a) or is not interpretable until a company becomes profitable for purposes of comparison.

one primary limitation of using p/e ratios emerges when comparing p/e ratios of different companies. valuations and growth rates of companies may often vary wildly between sectors due both to the differing ways companies earn money and to the differing timelines during which companies earn that money.

as such, one should only use p/e as a comparative tool when considering companies in the same sector, as this kind of comparison is the only kind that will yield productive insight. comparing the p/e ratios of a telecommunications company and an energy company, for example, may lead one to believe that one is clearly the superior investment, but this is not a reliable assumption.

## other p/e considerations

an individual company’s p/e ratio is much more meaningful when taken alongside p/e ratios of other companies within the same sector. for example, an energy company may have a high p/e ratio, but this may reflect a trend within the sector rather than one merely within the individual company. an individual company’s high p/e ratio, for example, would be less cause for concern when the entire sector has high p/e ratios.

moreover, because a company’s debt can affect both the prices of shares and the company’s earnings, leverage can skew p/e ratios as well. for example, suppose there are two similar companies that differ primarily in the amount of debt they take on. the one with more debt will likely have a lower p/e value than the one with less debt. however, if business is good, the one with more debt stands to see higher earnings because of the risks it has taken.

another important limitation of price-to-earnings ratios is one that lies within the formula for calculating p/e itself. accurate and unbiased presentations of p/e ratios rely on accurate inputs of the market value of shares and of accurate earnings per share estimates. the market determines the prices of shares through its continuous auction. the printed prices are available from a wide variety of reliable sources. however, the source for earnings information is ultimately the company themselves.this single source of data is more easily manipulated, so analysts and investors place trust the company”s officers to provide accurate information. if that trust is perceived to be broken the stock will be considered more risky and therefore less valuable.

to reduce the risk of inaccurate information, the p/e ratio is but one measurement that analysts scrutinize. if the company were to intentionally manipulate the numbers to look better, and thus deceive investors, they would have to work strenuously to be certain that all metrics were manipulated in a coherent manner, which is difficult to do. that”s why the p/e ratio continues to be one of the centrally referenced points of data to analyze a company, but by no means the only one.

## frequently asked questions

### what is a good price to earnings ratio?

the question of what is a good or bad price to earnings ratio will necessarily depend on the industry in which the company is operating. some industries will have higher average price to earnings ratios, while others will have lower ratios. for example, as of january 2020, publicly-traded us coal companies had an average p/e ratio of only about 7, compared to more than 60 for software companies. if you want to get a general idea of whether a particular p/e ratio is high or low, you can compare it to the average p/e of the competitors within its industry.

### is it better to have a higher or lower p/e ratio?

many investors will say that it is better to buy shares in companies with a lower p/e, because this means you are paying less for every dollar of earnings that you receive. in that sense, a lower p/e is like a lower price tag, making it attractive to investors looking for a bargain. in practice, however, it is important to understand the reasons behind a company’s p/e. for instance, if a company has a low p/e because their business model is fundamentally in decline, then the apparent bargain might be an illusion.

### what does a p/e ratio of 15 mean?

simply put, a p/e ratio of 15 would mean that the current market value of the company is equal to 15 times its annual earnings. in other words, if you were to hypothetically buy 100% of the company’s shares, it would take 15 years for you to earn back your initial investment through the company’s ongoing profits.

wca-america.com requires writers to use primary sources to support their work. these include white papers, government data, original reporting, and interviews with industry experts. we also reference original research from other reputable publishers where appropriate. you can learn more about the standards we follow in producing accurate, unbiased content in oureditorial policy.

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