Understanding the Price/Earnings-to-Growth (PEG) Ratio

The Price/Earnings-to-Growth (PEG) ratio is a key stock valuation metric popularized by renowned investor Peter Lynch. While the standard Price-to-Earnings (P/E) ratio shows how much investors pay per dollar of earnings, it does not factor in expected future earnings growth. The PEG ratio adjusts P/E relative to projected growth, providing a more complete picture of stock valuation.

How to Calculate PEG and PEGY Ratios

The PEG ratio is computed by dividing a company's P/E ratio by its estimated Annual Earnings Per Share (EPS) growth rate:

$$\text{PEG Ratio} = \frac{\text{P/E Ratio}}{\text{EPS Growth Rate (\%)}}$$

For dividend-paying companies, analysts often use the Dividend-Adjusted PEG Ratio (PEGY), which includes dividend yield in the growth factor:

$$\text{PEGY Ratio} = \frac{\text{P/E Ratio}}{\text{EPS Growth Rate (\%)} + \text{Dividend Yield (\%)}}$$

Interpreting PEG Ratio Values

PEG < 1.0

Potentially Undervalued. The earnings growth rate is higher than the P/E multiple.

PEG = 1.0

Fairly Valued. The market price aligns cleanly with expected earnings growth.

PEG > 1.0

Potentially Overvalued. The stock trades at a premium relative to its growth pace.

Frequently Asked Questions

What is a good PEG ratio for a stock?

Traditionally, a PEG ratio below 1.0 suggests a stock may be undervalued relative to its growth rate, while values significantly above 1.0 may indicate overvaluation.

What is the difference between PEG and P/E ratio?

The P/E ratio measures current valuation relative to earnings, but treats fast-growing and slow-growing companies identically. The PEG ratio factors growth rate into the equation.

Why should dividends be included in the PEGY ratio?

Mature companies often return capital via dividends rather than reinvesting heavily in fast EPS growth. Adding dividend yield prevents dividend stocks from looking artificially overvalued.

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