The P/E formula
P/E = Stock Price / Earnings Per Share
- Stock Price = current market price per share
- EPS = net income divided by shares outstanding
What different P/E ranges suggest (starting points for questions, never verdicts)
| P/E Range | What It Suggests | Common In |
|---|---|---|
| Below 10x | Cheap or facing problems | Banks, energy, cyclical sectors |
| 10-20x | Fairly valued for stable growth | Consumer staples, industrials |
| 20-35x | High growth expected | Technology, high-growth healthcare |
| Above 35x | Very high expectations or speculative | Hypergrowth, unprofitable tech |
Why a low P/E is not automatically cheap
Caution: A low P/E is not automatically a bargain. A stock at 5x earnings might be cheap, or it might be a company whose earnings are about to collapse. Always ask WHY.
Is Apple's P/E a premium or a discount?
Open AAPL in Company financials and find its diluted EPS for the last few years. P/E is just a share price divided by that number: at a $150 share price and $6 of EPS it would be 25x. Signed in? Find AAPL's live P/E on its ticker page and compare it with the technology range in the table above.
Does a lower P/E mean a better investment?
Stock A trades at P/E 30x. Stock B trades at P/E 10x. Which is the better investment?
P/E shows price, not value
Check your understanding
Sit with the ideas.
Apple has a P/E of 28x and the tech sector median is 25x. What does this suggest?
Why:
Try this in paper trading
Buy the cheaper of two competitors
Pick a sector you understand — coffee, banks, semis. Find two competitors. Compare their P/E ratios. Paper-buy the cheaper one and write a thesis explaining why the market might be wrong (or right) about the discount.
Open paper portfolio →Practice mode — simulated trades, not investment advice.