P/E Ratio

The P/E ratio is the first valuation number most investors learn, and for good reason: it offers a quick read on how expensive a stock is relative to the profit it generates.

How it works

P/E = share price ÷ earnings per share (EPS). A P/E of 25 means the market is paying ₹25 for every ₹1 of the company's annual earnings. Loosely, it is the number of years of current profit it would take to earn back the price.

There are two common versions: trailing P/E, based on the last 12 months of actual earnings, and forward P/E, based on analysts' estimates for the year ahead. Trailing is factual; forward is a forecast and can be wrong.

In India

A high P/E signals that investors expect strong future growth, while a low P/E can mean a cheap bargain or a struggling business the market has written off. Indian markets often command higher P/Es than developed markets because of stronger expected growth.

Never judge a P/E in isolation. Compare it within the same sector: a fast-growing IT or consumer company naturally trades at a richer multiple than a slow PSU bank or a cyclical metal stock. You can also gauge the broad market's temperature using the Nifty 50 P/E, published by the NSE, against its own long-term history to sense whether the index is cheap or frothy.

Why it matters

P/E links price to fundamentals and stops you from buying purely on hype. It is the starting point for asking whether a stock's price is justified by its profits.

Common mistakes

The ratio breaks down for loss-making firms (negative or meaningless P/E) and for cyclicals, where a low P/E at the peak of the cycle is a value trap. It also ignores debt and growth rate; that is why analysts pair it with the PEG ratio (P/E divided by growth) and metrics like P/B, ROE, and debt levels. A low P/E is not automatically "cheap", and a high one is not automatically "expensive". Always ask *why* the market is assigning that number.