How to check PE ratio

The price-to-earnings (or P/E) ratio compares a company's share price with its earnings per share (EPS). It is one of the most widely used valuation tools and helps investors judge whether a stock appears expensive or inexpensive compared with its earnings.

Key points:

• The P/E ratio is calculated as the Current Market Price (CMP) divided by Earnings Per Share (EPS).
• A high P/E ratio usually reflects strong growth expectations or a higher valuation.
• A low P/E ratio may indicate an undervalued stock or slower expected growth.
• The trailing P/E uses earnings from the previous 12 months, while the forward P/E uses projected future earnings.
• Investors should compare P/E ratios only with companies operating in the same industry.
• The P/E ratio works best when combined with other valuation metrics such as DCF, WACC, and the price-to-book ratio.

The P/E ratio is calculated by dividing the Current Market Price (CMP) of a company's share by its earnings per share (EPS).

Formula

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

This calculation tells investors how much the market is willing to pay for each ₹1 of the company's earnings.

Example

Assume the following:

In this example, investors are willing to pay ₹20 for every ₹1 the company earns.

Now consider another example.

Although both companies have the same share price, Company B has a lower P/E ratio because it generates higher earnings. This suggests investors are paying less for each unit of Company B's earnings than Company A's.

However, this does not automatically make Company B a better investment. Investors should also evaluate future earnings growth, business quality, and industry conditions before drawing conclusions.

The P/E ratio is calculated by dividing the Current Market Price (CMP) of a company's share by its earnings per share (EPS).

Formula

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

This calculation tells investors how much the market is willing to pay for each ₹1 of the company's earnings.

Example

Assume the following:

In this example, investors are willing to pay ₹20 for every ₹1 the company earns.

Now consider another example.

Although both companies have the same share price, Company B has a lower P/E ratio because it generates higher earnings. This suggests investors are paying less for each unit of Company B's earnings than Company A's.

However, this does not automatically make Company B a better investment. Investors should also evaluate future earnings growth, business quality, and industry conditions before drawing conclusions.

What are the different types of P/E ratios?

There are two commonly used types of the P/E ratio. Both help investors evaluate stocks, but they rely on different earnings data.

Forward P/E ratio

The forward P/E ratio uses earnings per share (EPS), instead of historical earnings. It is calculated by dividing the current market price by analysts' projected earnings per share.

This ratio helps investors estimate how expensive or inexpensive a stock could be based on expected future performance rather than past financial results.

Trailing P/E ratio

The trailing P/E ratio uses a company's actual earnings from the previous 12 months. It is calculated using reported financial statements instead of estimated future earnings.

Because it is based on actual earnings, the trailing P/E ratio provides a more objective measure of a company's historical valuation. It allows investors to compare companies using verified financial data rather than forecasts.

The P/E ratio is one of the most widely used tools in value investing. It helps investors compare a company's share price with its earnings to identify whether a stock appears overvalued or undervalued. However, the P/E ratio should always be analysed alongside a company's financial performance, industry trends, and future growth potential.

If a company has a high P/E ratio

A high P/E ratio means investors are paying more for every ₹ 1 of the company's earnings. This often reflects strong growth expectations, but it can also indicate that the stock is trading at a premium valuation. Value investors usually analyse whether the higher valuation is supported by future earnings before investing.

If a company has a low P/E ratio

A low P/E ratio means the company's share price is relatively low compared to its earnings. This may indicate that the stock is undervalued, making it attractive to value investors. However, a low P/E ratio can also reflect weak business performance or other risks, so investors should evaluate the company's fundamentals before making an investment decision.

There is no single P/E ratio that is considered "good" for every stock. A suitable P/E ratio depends on factors such as the company's industry, growth prospects, market conditions, and earnings performance. Rather than looking at the number in isolation, investors usually compare a company's P/E ratio with its peers in the same sector to understand whether it is fairly valued.

For example, if Company A has a P/E ratio of 40 while Company B, operating in the same industry with similar business characteristics, has a P/E ratio of 10, investors are paying four times more for every ₹ 1 of earnings generated by Company A. This could mean Company A is expected to grow much faster, or it may simply be trading at a premium. On the other hand, Company B may appear undervalued, making it worth further research.

When evaluating a P/E ratio, consider the following factors:

• Compare with industry peers: A company's P/E ratio should be compared with similar businesses because acceptable valuation levels differ across industries.
• Review historical performance: Comparing the current P/E ratio with the company's own historical average can help determine whether the stock is trading above or below its usual valuation.
• Consider growth expectations: Companies with higher expected earnings growth often trade at higher P/E ratios because investors anticipate stronger future performance.
• Assess overall market conditions: During bullish markets, average P/E ratios tend to rise, while bearish markets often result in lower market valuations.
• Look beyond one metric: The P/E ratio should always be used alongside other financial ratios and company fundamentals to make a balanced investment decision.

A high P/E ratio does not always mean a stock is overvalued, just as a low P/E ratio does not always indicate a bargain. Some companies trade at high valuations because investors expect strong earnings growth, while others may have low valuations due to slowing business performance or financial concerns.

To build a more complete picture of a company's financial health, investors often combine the P/E ratio with other valuation and profitability metrics, such as:

• Discounted Cash Flow (DCF)
• Weighted Average Cost of Capital (WACC)
• Price-to-book ratio
• Return on Equity (ROE)
• Return on Capital Employed (ROCE)

Using multiple financial indicators together provides a more reliable assessment than relying solely on the P/E ratio.

The price-to-earnings (P/E) ratio shows how much investors are willing to pay for a company’s earnings. It helps assess whether a stock appears overvalued or undervalued. However, it should not be used alone, as valuation depends on industry trends, growth prospects, and market conditions. Comparing the P/E ratio with peers and measures such as EPS, DCF, WACC, and the price-to-book ratio provides a more balanced view and supports informed investment decisions through broader fundamental analysis.