It's not a stretch to say that McKesson Corporation's (NYSE:MCK) price-to-earnings (or "P/E") ratio of 17.3x right now seems quite "middle-of-the-road" compared to the market in the United States, where the median P/E ratio is around 17x. Although, it's not wise to simply ignore the P/E without explanation as investors may be disregarding a distinct opportunity or a costly mistake.

With its earnings growth in positive territory compared to the declining earnings of most other companies, McKesson has been doing quite well of late. It might be that many expect the strong earnings performance to deteriorate like the rest, which has kept the P/E from rising. If not, then existing shareholders have reason to be feeling optimistic about the future direction of the share price.

Check out our latest analysis for McKesson

What Are Growth Metrics Telling Us About The P/E?

McKesson's P/E ratio would be typical for a company that's only expected to deliver moderate growth, and importantly, perform in line with the market.

Taking a look back first, we see that the company grew earnings per share by an impressive 82% last year. The latest three year period has also seen an excellent 99% overall rise in EPS, aided by its short-term performance. So we can start by confirming that the company has done a great job of growing earnings over that time.

Looking ahead now, EPS is anticipated to climb by 6.6% per annum during the coming three years according to the analysts following the company. Meanwhile, the rest of the market is forecast to expand by 13% per annum, which is noticeably more attractive.

With this information, we find it interesting that McKesson is trading at a fairly similar P/E to the market. Apparently many investors in the company are less bearish than analysts indicate and aren't willing to let go of their stock right now. These shareholders may be setting themselves up for future disappointment if the P/E falls to levels more in line with the growth outlook.

What We Can Learn From McKesson's P/E?

While the price-to-earnings ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of earnings expectations.

We've established that McKesson currently trades on a higher than expected P/E since its forecast growth is lower than the wider market. When we see a weak earnings outlook with slower than market growth, we suspect the share price is at risk of declining, sending the moderate P/E lower. Unless these conditions improve, it's challenging to accept these prices as being reasonable.

There are also other vital risk factors to consider before investing and we've discovered 1 warning sign for McKesson that you should be aware of.

If you're unsure about the strength of McKesson's business, why not explore our interactive list of stocks with solid business fundamentals for some other companies you may have missed.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.