GlossaryPEG Ratio

PEG Ratio

P/E adjusted for how fast earnings are actually growing.

The PEG ratio divides the P/E ratio by the expected earnings growth rate. It adjusts valuation for growth, so a 30× P/E stock growing earnings 40% a year can look cheaper than a 12× P/E stock that isn't growing at all.

The formula

P/E RatioEPS Growth Rate (%)
= PEG Ratio

Why it matters

  • Compares growth stocks fairly against value stocks — a high P/E isn't automatically expensive.
  • Relies on a growth-rate estimate, which is itself a forecast and can be wrong.
  • Most useful for profitable, growing companies — less meaningful for cyclical or no-growth businesses.

How to read it

< 1.0Potentially undervalued relative to its growth rate
1.0–2.0Fairly valued
> 2.0Priced for very high growth, or simply expensive

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