What is P/E Ratio? A Beginner's Guide

Published by StockScore Editorial • Reading time: 4 mins

The Price-to-Earnings (P/E) Ratio is one of the most widely used metrics in stock investing. It compares a company's current stock price to its earnings per share (EPS). In simple terms, it shows how much investors are willing to pay for every ₹1 of profit the company generates.

How is P/E Ratio calculated?

The formula is straightforward:

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

For instance, if a company's share price is ₹150 and its EPS (profit per share) is ₹10, its P/E ratio is 15. This means you are paying 15 times the company's current earnings to buy one share.

What does a high or low P/E mean?

Low P/E Ratio (e.g., under 15x): This often suggests the stock is undervalued, or the market is pessimistic about its future. Value investors look for low P/E stocks to buy assets cheaply.
High P/E Ratio (e.g., over 35x): This suggests the stock is valued premium. The market expects strong growth in the future. Growth companies (like tech startups or FMCG giants) typically trade at high P/E multiples.

Important Caveat

P/E ratio should never be analyzed in isolation. A low P/E could be a "value trap" if the company is failing, and a high P/E could be fully justified if the company is growing at a rapid pace. Always compare a stock's P/E to its historical average and its sector competitors.