Close this search box.

Table of Contents

Price/Earnings-to-Growth (PEG) Ratio


The Price/Earnings-to-Growth (PEG) Ratio is a valuation metric for determining the relative trade-off between the price of a stock, the earnings generated per share (EPS), and the company’s expected growth. In general, the P/E ratio is higher for a company with a higher growth rate. Thus, using just the P/E ratio would make high-growth companies appear overvalued relative to others, and the PEG ratio adjusts for this by using the expected growth rate of earnings.


Price: /praɪs/Earnings-to-Growth: /ˈɜːrnɪŋz tuː ɡroʊθ/ (PEG) Ratio: /piː iː dʒiː/ /ˈreɪʃioʊ/

Key Takeaways

1. Understanding PEG Ratio: The Price/Earnings-to-Growth (PEG) Ratio is a valuation metric that assesses a company’s stock price compared to its earnings growth. It is a helpful tool for investors looking to determine if a company’s stock is overvalued or undervalued. It provides a more nuanced view than the more common Price-to-Earnings (P/E) ratio by also factoring in the company’s expected earnings growth rate.

2. Calculating PEG Ratio: PEG ratio is calculated by taking a company’s P/E ratio and dividing it by the projected earnings growth rate for a specified period, typically five years. A lower PEG ratio could suggest that a company’s stock is undervalued and potentially a good investment, while a higher PEG ratio could suggest that the stock is overvalued.

3. Limitations of PEG Ratio: While the PEG ratio can be a useful tool, it’s not without its limitations. It relies on projected earnings growth rate, which is only an estimate and can be inaccurate. Furthermore, similar to the P/E ratio, PEG ratios may not be as useful for comparing companies across different industries with different growth rates. PEG Ratios also may not be as effective when comparing companies that do not pay dividends or are not profitable.


The Price/Earnings-to-Growth (PEG) Ratio is a crucial metric in finance because it provides investors with a more nuanced understanding of an organization’s market value relative to its earnings growth. Unlike the Price-to-Earnings (P/E) ratio, which solely reflects current earnings, PEG incorporates future growth prospects. This makes it a better indicator of a firm’s undervaluation or overvaluation. If the PEG ratio is higher than one, it could suggest that a company is overvalued; if less than one, it might be undervalued. Hence, this key metric assists investors in making more informed choices, balancing current performance with future growth potential.


The Price/Earnings-to-Growth (PEG) Ratio is a vital tool that investors and analysts use to determine the relative trade-off between the price of a stock, the earnings provided per share, and the company’s expected growth in the future. Essentially, it is used to analyze and compare the relative valuations of companies in a sector or industry. The primary purpose of the PEG ratio is to provide a more nuanced view of a company’s valuation by incorporating future growth estimates, where traditional analysis tools such as Price-to-Earnings (P/E) ratio fail to do so. By taking into account earnings growth, the PEG ratio allows investors to compare the relative valuation of companies even if their growth prospects vary significantly. This consideration of growth gives investors a more comprehensive understanding of a company’s fundamental position and potential future earnings. Hence, it provides a more enriched perspective than some other valuation metrics and assists in making informed investment decisions. The lower the PEG ratio, the more the stock may be undervalued given its future growth. Therefore, PEG can serve as an important tool alongside other key ratios and financial metrics in the comprehensive stock analysis.


1. Apple Inc.: Consider one of the world’s largest tech companies, Apple Inc. To analyze its financial state and make investment decisions, investors often use the PEG ratio, among other financial statistics. Assume that Apple’s P/E ratio is 15, and its projected earnings growth rate for the next few years is 10% per year. The PEG ratio would be 1.5(15/10). Therefore, it might be seen as slightly overvalued because a PEG ratio of 1 is often considered a fair valuation.2. Amazon: Amazon is another good example. For a long time, the company’s P/E ratio was incredibly high, reaching over 100 at times, which would normally suggest overvaluation. However, considering Amazon’s high earnings growth rate, the PEG ratio paints a different picture. If Amazon’s estimated future growth rate is 25%, the PEG ratio would be 4 (100/25). Although this still indicates overvaluation, it is less extreme, considering the strong growth prospects.3. Johnson and Johnson: This pharmaceutical and consumer packaged goods manufacturer is a more mature company with slower growth rates. Let’s say it has a P/E ratio of 20 and an estimated future growth rate of 5%. This would make its PEG ratio 4 (20/5), suggesting that the stock might be overvalued against its future earnings growth. Please note the numbers provided in the above scenarios are hypothetical and don’t represent the actual PEG ratios of these corporations.

Frequently Asked Questions(FAQ)

What is the Price/Earnings-to-Growth (PEG) Ratio?

The Price/Earnings-to-Growth (PEG) Ratio is a valuation metric for determining the relative trade-off between the price of a stock, the earnings generated per share (EPS), and the company’s expected growth. It is a refinement of the P/E ratio that also considers the company’s growth rate.

How is the PEG ratio calculated?

The PEG ratio is calculated by dividing the P/E ratio of a stock by the growth rate of its earnings for a specific time period. The PEG ratio formula is: PEG = P/E ÷ Annual EPS Growth

What is a good PEG ratio?

Generally, a PEG ratio of 1 is considered good, implying that the company is fairly priced given its growth rate. A PEG ratio below 1 might indicate that the stock is undervalued and a good buy, while a PEG ratio above 1 could suggest that the stock is overvalued or the market has high growth expectations.

When should I use the PEG ratio?

The PEG ratio can be particularly useful when comparing companies in different industries, or when trying to determine an industry average. It can also help you understand if a stock in a high growth industry is overpriced or underpriced.

Can the PEG ratio be used for companies with negative earnings?

No, the PEG ratio cannot be calculated for companies with negative earnings or growth rates since it would result in negative or undefined values.

What are the limitations of the PEG ratio?

The PEG ratio largely relies on future projections or past growth rates, which may not be accurate. It also doesn’t factor in dividends, and can give misleading results for companies that pay dividends. Also, it may not be suited for comparing companies in different growth stages or in different countries with varying growth rates.

Related Finance Terms

Sources for More Information

About Due

Due makes it easier to retire on your terms. We give you a realistic view on exactly where you’re at financially so when you retire you know how much money you’ll get each month. Get started today.

Due Fact-Checking Standards and Processes

To ensure we’re putting out the highest content standards, we sought out the help of certified financial experts and accredited individuals to verify our advice. We also rely on them for the most up to date information and data to make sure our in-depth research has the facts right, for today… Not yesterday. Our financial expert review board allows our readers to not only trust the information they are reading but to act on it as well. Most of our authors are CFP (Certified Financial Planners) or CRPC (Chartered Retirement Planning Counselor) certified and all have college degrees. Learn more about annuities, retirement advice and take the correct steps towards financial freedom and knowing exactly where you stand today. Learn everything about our top-notch financial expert reviews below… Learn More