It's not a stretch to say that AutoZone, Inc.'s (NYSE:AZO) price-to-earnings (or "P/E") ratio of 17.2x 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, AutoZone 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.

View our latest analysis for AutoZone

Does Growth Match The P/E?

There's an inherent assumption that a company should be matching the market for P/E ratios like AutoZone's to be considered reasonable.

If we review the last year of earnings growth, the company posted a terrific increase of 15%. The latest three year period has also seen an excellent 91% 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 9.5% per annum during the coming three years according to the analysts following the company. That's shaping up to be materially lower than the 12% per year growth forecast for the broader market.

In light of this, it's curious that AutoZone's P/E sits in line with the majority of other companies. Apparently many investors in the company are less bearish than analysts indicate and aren't willing to let go of their stock right now. Maintaining these prices will be difficult to achieve as this level of earnings growth is likely to weigh down the shares eventually.

The Bottom Line On AutoZone's P/E

We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that AutoZone currently trades on a higher than expected P/E since its forecast growth is lower than the wider market. Right now we are uncomfortable with the P/E as the predicted future earnings aren't likely to support a more positive sentiment for long. Unless these conditions improve, it's challenging to accept these prices as being reasonable.

Plus, you should also learn about these 3 warning signs we've spotted with AutoZone (including 2 which are potentially serious).

If P/E ratios interest you, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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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.