Open any stock page and you'll see a number called the P/E ratio. People use it as shorthand for "cheap" or "expensive" — and usually get it wrong. Here's what price-to-earnings actually measures, and how to read it without being fooled. This is for learning only.
What it measures
P/E = price ÷ earnings per share. If a stock trades at ₹500 and earned ₹25 per share last year, its P/E is 20. The simplest reading: you're paying ₹20 for every ₹1 the company earns in a year. Put another way, at today's earnings it would take 20 years to earn back the price.
What's "high" and "low"?
There's no universal number, but roughly: a single-digit P/E is often called cheap, the broad market tends to sit in the high-teens to low-20s, and fast growers can trade at 40, 60 or more. But — this is the whole point — a low P/E is not automatically a bargain, and a high one is not automatically overpriced.
Why a low P/E can be a trap
- The market expects trouble. A P/E of 5 often means investors think earnings are about to fall. The "cheap" price is cheap for a reason — a classic value trap.
- One-off profits. If last year's earnings were flattered by a one-time gain (selling a building, say), the P/E looks low but isn't real.
Why a high P/E isn't always bad
A company growing earnings 30% a year can justify a high P/E, because this year's profit looks small against next year's. Paying a rich multiple for genuine, durable growth can be reasonable; paying it for hype is not.
How to use it sensibly
- Compare like with like. A bank's normal P/E is nothing like a software company's. Judge a stock against its own history and its direct peers, not the whole market.
- Pair it with growth. A P/E of 30 on a company growing 30% is very different from a P/E of 30 on one growing 3%.
- Check the earnings are real — steady, cash-backed profits, not a one-off spike.
The honest summary: P/E is a useful first glance, not a verdict. It tells you how much optimism is already baked into a price — nothing more. For the other numbers that complete the picture, see how to filter winning stocks, and remember that a disciplined, rule-based process — the idea behind our Model Portfolio — weighs valuation as one input among several, never in isolation.
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