Learn · Valuation
What is the P/E ratio and how to use it
The P/E ratio is price per share divided by earnings per share. It tells you how many rupees you are paying for every rupee of a company's profit. Compare it within a sector, not across sectors.
In one line
The P/E ratio equals the current share price divided by earnings per share (EPS), so a stock priced at 100 rupees with an EPS of 5 rupees has a P/E of 20, meaning you are paying 20 rupees for every 1 rupee of annual profit; trailing P/E uses the last 12 months of actual earnings, forward P/E uses estimated future earnings, and the same number can be cheap in one sector and expensive in another.
BazaarBaaziSource & method
P/E basics and the trailing vs forward split
P/E is the most widely quoted valuation metric in equity markets. You divide the current share price by the earnings per share. EPS is the company's net profit divided by the total number of shares outstanding. A P/E of 20 means the market is willing to pay 20 rupees today for every 1 rupee of current annual earnings, which reflects the expected growth and stability of that business.
Trailing P/E uses the actual EPS from the last 4 reported quarters. It is factual and backward-looking. Forward P/E uses the consensus estimate of what the company will earn in the next 12 months or the next financial year. Forward P/E is inherently uncertain because it rests on analyst forecasts, but it is more relevant for fast-growing companies where today's earnings understate where the business is heading. Both numbers are useful; the skill is knowing which one the market is pricing at a given moment.
Why sector context is non-negotiable
P/E cannot be read in isolation. Different industries have structurally different P/E profiles. A mature, slow-growing business might deserve a P/E of 10 to 15. A high-growth consumer technology business might rationally trade at a P/E of 50 or 60, because the market is paying for future earnings that are not yet in the denominator. Comparing a bank's P/E to a pharma company's P/E and concluding one is cheaper is a category error.
The right comparison is always within the same sector: this company against its direct peers, and against its own historical P/E range. A company trading below its own 5-year average P/E while fundamentals are intact is a more defensible value call than simply picking the lowest absolute number in a screener. Also watch earnings quality: a high P/E driven by one-time gains in the denominator looks cheaper than it is, and low earnings from a temporary write-off can inflate P/E on a perfectly healthy business.
FAQ3 reader questions · AEO-eligible
Common questions on what is p/e ratio.
What is a good P/E ratio for a stock?
There is no universal good P/E. It depends on the sector, growth rate, and quality of the business. A stock is better judged by comparing its P/E to sector peers and to its own historical range, not by an absolute number.
Is a lower P/E always better?
Not necessarily. A very low P/E can reflect a genuinely cheap stock or a structurally declining business that deserves to be cheap. Similarly, a high P/E is not always expensive if the company's earnings are growing fast enough to justify it. Context matters more than the raw number.
What is the difference between trailing and forward P/E?
Trailing P/E divides the current price by the actual earnings of the last 12 months. Forward P/E divides the current price by estimated future earnings. Forward P/E is more relevant for growth companies but depends on forecast accuracy.
Keep learning
Adjacent concepts every Indian retail investor should have straight.
Hub
All explainers
Valuation
Book value
What a company is worth on paper, and how the P/B ratio compares that to the market price.
Basics
Large, mid and small cap
How SEBI classifies Indian stocks, and what the risk and return profile looks like across the 3 buckets.
Income
Dividend yield
The formula, what a fat yield really means, and the value trap hiding inside it.
IPO
What is GMP
The unofficial pre-listing price chatter, what it signals, and why it is not a guarantee.