The P/E Ratio

beginner7 min read

The most quoted, most misunderstood number in investing. What it means and what it hides.

P/E = Share price ÷ Earnings per share (EPS)

How many rupees you pay for each ₹1 of the company’s annual profit.

The P/E ratio is the market’s most-quoted valuation number. A P/E of 20 means you’re paying ₹20 for every ₹1 of yearly earnings — or, flipped, the company earns a 5% “earnings yield” on your purchase price. Higher P/E = the market expects more growth (or is more optimistic).

A high P/E isn’t “expensive” and a low P/E isn’t “cheap” on its own — P/E is the market’s expectation gauge. A 40 P/E can be a bargain for a fast compounder; an 8 P/E can be a trap for a dying business. P/E only means something next to growth, quality and peers.

Common mistake“This stock has a low P/E, so it’s cheap.” Often it’s low precisely because the market expects earnings to fall. Low P/E + deteriorating business = a value trap, not a bargain.

Key takeawayP/E = price per ₹1 of earnings; it captures the market’s growth/quality expectations. Never read it alone — judge it against growth, quality and peers.

FAQs

What is a good P/E ratio?

There’s no universal “good” number — it depends on growth, quality and industry. A stable utility may deserve a P/E of 15, a high-growth franchise 40+. Compare a company to its own history and close peers, and always ask what growth the P/E implies.

Trailing vs forward P/E?

Trailing P/E uses the last 12 months’ actual earnings; forward P/E uses estimated future earnings. Forward P/E reflects expected growth but relies on forecasts that can be wrong — useful, but treat the estimates with caution.