What is PEG Ratio?
Definition
The PEG Ratio (Price/Earnings-to-Growth) adjusts the P/E ratio by dividing it by the expected earnings growth rate. It helps investors determine whether a stock's valuation is justified by its growth prospects, with a PEG of 1.0 generally considered fair value.
Detailed Explanation
The PEG ratio was popularized by legendary investor Peter Lynch, who considered it one of the most useful valuation tools. It is calculated by dividing a company's P/E ratio by its expected annual EPS growth rate. A PEG below 1.0 suggests the stock may be undervalued relative to its growth, while above 1.0 suggests it may be overvalued.
For example, a company with a P/E of 30 and expected growth of 30% has a PEG of 1.0, suggesting fair value. A company with a P/E of 30 and growth of only 15% has a PEG of 2.0, suggesting it might be overpriced. The ratio normalizes valuation across companies with different growth rates, making it easier to compare a fast-growing tech company to a slow-growing utility.
The growth rate used can be historical (trailing PEG) or forward-looking (forward PEG). Most analysts prefer the forward PEG using consensus estimates for the next 3-5 years. The choice of growth rate significantly affects the result, so investors should consider multiple scenarios.
Limitations include sensitivity to the growth estimate used, inability to handle negative earnings or growth, and the assumption that growth is linear. Very high growth rates are unlikely to persist, so a low PEG based on unsustainable growth can be misleading. The PEG ratio also ignores dividends, balance sheet strength, and cash flow quality.
Formula
PEG Ratio = (P/E Ratio) / Annual EPS Growth Rate (%)Example
A stock trading at a P/E of 25 with expected EPS growth of 20% per year has a PEG of 25/20 = 1.25. Peter Lynch considered PEGs below 1.0 as attractive buying opportunities.
Frequently Asked Questions
What PEG ratio indicates a good investment?
Should I use forward or trailing PEG?
Related Terms
Earnings Per Share (EPS)
Earnings Per Share (EPS) measures a company's net profit divided by its outstanding shares of common stock. It is one of the most widely used metrics for evaluating a company's profitability on a per-share basis and comparing performance across companies.
Price-to-Earnings Ratio (P/E)
The Price-to-Earnings Ratio (P/E) compares a company's current stock price to its earnings per share. It indicates how much investors are willing to pay for each dollar of earnings, making it one of the most common valuation metrics in stock analysis.
Forward Guidance
Forward guidance is the projection or forecast that a company's management provides about expected future financial performance. Typically shared during earnings calls, it includes estimates for revenue, earnings, margins, and other key metrics for upcoming quarters or the full year.
Earnings Yield
Earnings yield is the inverse of the P/E ratio, calculated as earnings per share divided by the stock price, expressed as a percentage. It allows direct comparison between stock returns and bond yields, making it useful for cross-asset valuation decisions.
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Disclaimer: The information on this page is provided for educational and informational purposes only and does not constitute investment advice. AI-generated analysis may contain errors or inaccuracies. Always conduct your own research and consult a qualified financial advisor before making investment decisions.
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