What Is P/E Ratio? A Simple Guide With Real Indian Stock Examples

What P/E ratio actually means

The price-to-earnings (P/E) ratio tells you how many rupees investors are paying for every rupee a company earns. If a stock has a P/E of 15, the market is valuing it at 15 times its annual earnings per share.

That's it. Everything else about the P/E ratio is just learning when that number is meaningful and when it isn't.

The formula

P/E Ratio = Current Share Price ÷ Earnings Per Share (EPS)

Take TCS as an example:

If TCS's share price is ₹2,000 and its trailing 12-month EPS is ₹125, its P/E works out to 2,000 ÷ 125 = 16. Investors are paying ₹16 for every ₹1 of TCS's annual profit.

Now look at a bank like HDFC Bank:

Indian banks typically trade at lower P/E multiples than IT services companies. That difference isn't a flaw in the ratio — it reflects how the market prices different kinds of businesses. Which brings up the part most explanations skip entirely.

Why you can't compare P/E across sectors

A P/E of 15 means something completely different for an IT company than it does for a bank, an FMCG company, or a textile manufacturer. Each sector has its own typical earnings multiple, based on how predictable its cash flows are, how fast it's expected to grow, and how capital-intensive the business is.

IT services companies have historically traded in the high-teens to twenties range. Indian banks often trade lower, partly because their earnings carry credit-risk uncertainty that IT firms don't. Consumer and retail businesses can trade at 40-60x or more, because the market is pricing in years of future growth, not just this year's profit.

Trailing P/E vs forward P/E

There are two versions of this ratio, and mixing them up leads to bad conclusions:

• Trailing P/E uses the company's actual earnings from the past 12 months. It's backward-looking but reliable — the numbers are already reported.
• Forward P/E uses analysts' earnings estimates for the next 12 months. It's more useful for fast-growing companies, but depends entirely on how accurate those estimates turn out to be.
  A stock can look expensive on trailing P/E and cheap on forward P/E if the market expects earnings to grow quickly — or the opposite, if a slowdown is expected. When you see a P/E number quoted anywhere, check which one it is before drawing conclusions.

Is a high or low P/E "good"?

Neither, by itself. A low P/E can mean a stock is genuinely undervalued — or it can mean the market has legitimate doubts about the company's future earnings. A high P/E can mean investors expect strong growth — or it can mean the stock is simply overpriced relative to what the business can deliver.

A quick reality check: PEG ratio

If you want to account for growth directly, the PEG ratio adjusts P/E for expected earnings growth:

PEG = P/E ÷ Expected EPS Growth Rate (%)

A PEG under 1 generally suggests the stock may be reasonably priced relative to its growth. A PEG well above 1 suggests you might be paying a premium for growth that isn't guaranteed to show up. It's not a perfect fix, but it's a useful second check before relying on P/E alone.

The limits of P/E ratio

P/E has real blind spots worth knowing before you lean on it too heavily:

• It's not usable for loss-making companies — there's no meaningful P/E when earnings are negative.
• It ignores debt entirely. Two companies with the same P/E can carry very different levels of financial risk.
• Reported earnings can be shaped by accounting choices, one-off gains, or write-offs, so EPS isn't always a clean number.
• It says nothing about the underlying quality of the business, only what the market is paying for its current earnings.
  Because of this, P/E works best as a starting filter, not a final verdict. Pair it with return ratios like ROE or ROCE, and check the balance sheet, before drawing conclusions.

Try it: value a stock using P/E

Enter a company's EPS and a target P/E multiple to see what fair value that implies, then compare it against the current market price.

Comparing P/E across companies

Comparing P/E only works within the same sector. Here's how three well-known Indian companies stack up against each other:

Look at where each company sits relative to its own sector peers, not against companies from a different industry entirely.

FAQs

Is a low P/E ratio always good?
No. A low P/E can signal undervaluation, but it can also reflect real concerns about a company's future earnings, slowing growth, or sector-wide weakness. Always check why the P/E is low before assuming it's a bargain.

What is a good P/E ratio in India?
There's no single "good" number — it depends entirely on the sector and the company's own historical range. A P/E that looks high for a bank might look cheap for an IT or consumer stock. Compare within the sector, not across it.

Why do IT and FMCG stocks have such different average P/E ratios?
Because the market prices in different growth expectations and risk levels for each. FMCG companies often have more predictable, steadily growing earnings, which tends to support higher multiples. IT companies' multiples move more with global demand cycles and currency effects.