P/E Ratio (Price-to-Earnings)

The P/E ratio tells you how much investors pay for each dollar a company earns. A higher P/E means the market expects more growth.

A quick example

What it means for you

It is the fastest way to gauge whether a stock looks cheap or expensive relative to its profits.

Picture this

A utility trades at 14 times earnings while a software platform in the same portfolio trades at 45. Taken at face value, the utility looks cheaper, but the comparison is meaningless across industries: utilities grow slowly and pay dividends, so low multiples are normal; software firms reinvest for growth, so high multiples are expected. The scenario where P/E misleads most is comparing a cyclical company at the top of its cycle with a steady grower. When an automaker earns record profits in a boom, its P/E can look tiny — but those earnings are about to collapse.

Common mix-ups

P/E is not the same as PEG. PEG also weighs growth, so a high P/E can be fair if earnings grow fast.

How to apply it

Use P/E as a gate, not a verdict. A multiple far above the sector average needs a growth story to defend it; a far-below average multiple can mean a bargain or a value trap. Compare the current P/E against the company’s own five-year average rather than just the market.

Key takeaway

Keep the P/E in its proper role: a screening tool that raises questions, not an answer in itself. The same multiple can mean a bargain, a growth story, or a value trap depending on the industry, the growth rate, and the company’s own history. Before acting on a P/E, ask three things — what is normal for this sector, how fast is this company growing, and how does today’s multiple compare with its five-year average. Only then does the number start to mean something.

Definitions reviewed by the Investing Glossary editorial team.