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P/E Ratio

The price-to-earnings (P/E) ratio compares a company's share price to its earnings per share — the classic gauge of how expensive a stock is.

In one line: The price-to-earnings (P/E) ratio compares a company's share price to its earnings per share — the classic gauge of how expensive a stock is.

What it is

The P/E ratio divides a stock's price by its earnings per share (EPS). It answers: how much are investors paying for each dollar of the company's annual profit? A P/E of 20 means you pay $20 for every $1 of yearly earnings. It's the most widely quoted valuation metric in the market.

P/E = Price ÷ Earnings per share. Trailing P/E uses the last 12 months of actual earnings; forward P/E uses analysts' estimates for the year ahead.

How it works

A P/E is only meaningful in context:

  • Versus peers: compare a company to others in the same sector, not across sectors — software and utilities carry very different normal multiples.
  • Versus its own history: is the stock expensive or cheap relative to where it usually trades?
  • Growth-adjusted: a high P/E can be justified by fast growth; the PEG ratio divides P/E by the growth rate to account for this.

A high P/E signals the market expects strong future growth; a low P/E signals modest expectations — or a company in trouble (a 'value trap').

Worked example

Example

A large-cap trades at $200 and earned $8 per share over the last year. Its trailing P/E is 200 ÷ 8 = 25. A slower-growing peer at $120 with $10 of EPS has a P/E of 12. The first company looks 'expensive' — but if it's growing profits 25% a year while the peer is flat, the premium may be warranted. The raw multiple alone doesn't tell you which is the better buy; growth and quality do.

Why it matters

The P/E ratio is a fast, universal shorthand for valuation — a starting point for asking 'what does the market expect from this company?' But it's easily misused: it's meaningless for companies with no earnings, distorted by one-off items, and useless across different industries. Treat it as one input, never a verdict.

Entry Point Trading focuses on price, trend, and risk in its daily signal, and treats valuation as context — every call graded in the open, no return claims.

Keep learning

Related concepts

Dividend Investing
Owning companies that pay you cash to hold them.
Price-to-Book Ratio
Price versus the company's net asset value on the books.
Market Capitalization
A company's total market value — large-, mid- and small-cap.
Earnings Season
The quarterly reports that move stocks the most.
Relative Strength
Ranking what's leading vs. lagging the market.
Sector Rotation
How leadership rotates between sectors over the cycle.

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Common questions

FAQ

Is a low P/E always better?
No. A low P/E can mean a stock is cheap — or that the market expects its earnings to fall (a 'value trap'). A high P/E can be overpriced — or fair for a fast grower. The multiple only makes sense alongside growth, quality, and how the company compares to its own history and peers.
What's the difference between trailing and forward P/E?
Trailing P/E uses the last 12 months of reported earnings — actual, known numbers. Forward P/E uses analysts' estimates of future earnings, so it reflects expectations but can be wrong if those estimates miss. Many investors look at both to see how earnings are expected to change.

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