All about Price-To-Earnings Ratio (P/E)

Ratan Deep Saxena (Asstt Manager (Accounts & Finance))   (2998 Points)

13 April 2010  

All about Price-To-Earnings Ratio (P/E)

Price-To-Earnings Ratio is one of the simplest and most popular method of valuation which measures the price paid for a single share in comparison to its earnings per share. It is calculated by using the following formula:

PE RatioMarket Value Per Share / Earnings Per Share (EPS)

P/E ratio can be either on trailing or forward basis. Trailing P/E is a historical approach in which the earnings of past 12 months are considered. Forward P/E is a futuristic approach in which projected earnings for next 12 months are taken into account forvaluation . If some major shift is revenue pattern is expected in future, then it is recommended to use Forward P/E instead of Trailing P/E. Given the fact that stock prices of listed companies are usually volatile, their P/E will also be changing very frequently.


Comparison of P/E ratios with other companies in the same sector, or to the capital markets in general, or against the company’s own historical P/E ratios is done to identify better alternatives. A higher P/Eratio usually means that investors are willing to pay more for each unit of net income, so the stock is more expensive in comparison to one with lower P/Eratio. However, it must be understood that evenif a company has a low P/E ratio , it doesn’t necessarily mean that it is undervalued. In fact it may also mean that the company’s earning could be subject to flat / negative growth due to financial trouble.


P/E can be calculated for a particular industry or even for the entire stock market. Following is the valuation matrix for Sens*x as well as some other key sectoral indices consisting of India’s largest and most reputed companies across diverse sectors as on February 26, 2010

Index As on 26/02/2010 Market Cap (Rs. Cr) P/E Ratio
SENSEX 16429.55 2473984 20.15
MIDCAP 6397.82 943298 17.67
SMLCAP 8067.40 306883 14.01
AUTO 7170.99 220653 17.80
BANKEX 9828.68 514025 13.27
CONSUMER DURABLES 4001.78 19659 16.52
CAPITAL GOODS 13474.86 343585 27.83
FMCG 2662.05 236170 26.22
HEALTHCARE 4912.98 180690 35.64
IT 5173.99 484703 23.95
METAL 16401.52 613127 24.61
OIL & GAS 9596.24 799913 14.45
POWER 2961.56 618852 27.48
PSU 9414.28 1716820 15.33
REALTY 3236.69 106601 40.14


Given the fact that Sens*x is valued at a P/E of 20, we can generally assume that the sectors which are currently valued at P/E less than 20 are either undervalued or have lower growth potential as compared to Sens*x. This is evident from the fact that PSU index is valued at a P/E of 15.33 despite having huge assets. In recent budget, there were some negative news for Automobile as well as Oil & GasCompanies in the form of higher indirect tax levy, etc. which will have negative impact on their future performance and hence, their P/E is also comparatively lower. However, it would not be a good idea to assume that Realtycompanies will essentially have high growth potential due to their high P/E; perhaps, it may be a time for correction.


In general, the P/E ratio is higher for a company with a soaring growth rate. Thus, using just the P/E ratio as a valuation tool can make high-growth companies overvalued than their peers. If the P/E ratio is divided by the earnings growth rate, the resulting ratio called as Price/Earning to Growth Ration (PEG) can be a better alternative for comparing companies with different growth rates. Lower PEG is better option and vice-versa.


Though P/E is a very handy method of valuation, one need to understand that it does not cover the outstanding liabilities of the organization and hence, the investors need to carefully review the balance sheet before making any investment commitments.