What is the right P/E for a stock?

This is a very interesting question. Every investor keeps asking this question. However, as happens with other existential questions in life, there is no right answer to this question. In other words, it all depends on your judgment.

An investor may expect good earnings from a stock going forward and buy it at a high P/E. Another investor may not share the same enthusiasm and consider it an expensive stock. The right P/E depends on what you consider the earning potential of a stock.

Generally, P/E ratios of 12 to 20 are considered normal across companies with neutral to positive outlooks. Legendary Investment Guru Benjamin Graham said that 20 P/E the maximum one should pay for an investment purchase of a common stock. Many times you see that the P/E ratio of certain companies, sectors or a whole market traverses to dangerous levels. Generally, it happens when emotions run high and people forget the basics of stock valuation. In 2000-2001, we saw how technology companies were trading at 60-90 times their current earnings. These ratios are not sustainable in the long term. Event the best companies cannot deliver the growth required to justify the P/E ratios of 60-90 on consistent basis. Many times investors get into a frenzy of buying stocks that everybody else is buying and pay very dearly for this mistake.

If the P/E ratio of a sector or a company is higher compared to the historical average P/E, you have a reason to investigate the reason for this abnormal behavior. If there is a valid reason for such a high P/E, you may consider buying it otherwise stay away from it. Generally, whenever a sector or a whole market goes beyond its historical average P/E, there is a correction, unless there is a fundamental change in the business scenario. Therefore, when you see a stock with high P/E, you must ask how justified earning expectations are from the stock.

Different industries have different P/E ranges based on their earning potential. You will see many metal companies operating at low P/E ratios. That’s because they have low margins and there’s very little for them to differentiate from their competitors. Hence, their ability to command a price premium from their customers is limited. On the other hand, technology companies generally sell at a higher P/E multiple as people have high expectations from them. These companies in general are able to grow at a faster clip too. Hence, variations in the P/E ranges of different industries are acceptable. One pertinent point here is that high P/E ratio makes a company risky too as its high stock price is based on future expectations rather than its past or current earnings. This is generally true of new technology companies. Many value investors stay away from technology companies as they cant put a price on the value of the technology. Frankly, it’s not an easy task to predict evaluate the business value of a technology with certainty, as tech space keeps changing very quickly. You should, however, not treat all technology companies equally. A few of them like Microsoft, Google, Oracle, etc have developed product portfolios and brand equity that helps them ensure that they have a predictable earning stream. If you can understand how a company is making money and how sustainable its earnings are, you can put a value to its stock. Otherwise, you will be indulging in speculation by buying a stock that you don’t understand.

Cyclical industries generally have varying average P/E ranges based on the phase of the industry. Steel industry goes through a cycle or 8-10 years during which demand in the market goes from low to high to low again. The industry also goes through a complete cycle of high capacity utilization, high capacity creation and low capacity utilization, which leads to further variations in the financials of the companies.

You should also note the limitations of using P/E ratio. Earnings are not cash flow. Many a times, company management try to fool the investors by manipulating earnings in a particular year, as it’s an accounting measure. While you must have a look at the P/E of a stock before making your investment decision, P/E ratio in isolation is not an indicator of the worth of a stock. You must look at the past earnings, changes in the accounting policy and free cash flow of the company to counter this problem.


On its own, P/E ratio is meaningless. It’s an indicator of the value of a stock. It’s not the cause of the value of the stock. It’s an effect. Understand the difference. There must be a fundamental reason why a stock is priced the way it is. Your analysis should help you find this reason. You will also see that some of the companies in a sector trade at a relatively higher P/E than others. There must be a reason for this difference in the companies. May be the companies with a higher P/E are more efficient. Or they have a strong brand that ensures that customers keep flocking to them. If a company is going to launch a potential market-winning product, there is a reason for a high P/E. If a stock has got a low P/E, this is not a reason enough for you to invest in the stock. If there is a regulatory change that’s going to make life difficult for a company, there is a reason for a low P/E. Therefore; you must try to understand the underlying reason for a stock’s P/E variation from the norm. If you are able to get to the root of the variation, you will be in a position to make your own decision on the stock.