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Calculating Peg with Negative Growth

Reviewed by Calculator Editorial Team

The PEG ratio (Price/Earnings to Growth) is a stock valuation metric that compares a company's stock price to its earnings growth. When earnings growth is negative, the calculation requires special handling to avoid division by zero and to properly reflect the company's financial situation.

What is PEG Ratio?

The PEG ratio is a valuation metric that combines the Price-to-Earnings (P/E) ratio with the company's earnings growth rate. It helps investors assess whether a stock is overvalued or undervalued by comparing its current price to its expected earnings growth.

The standard formula is:

PEG Ratio = (P/E Ratio) / (Earnings Growth Rate)

Where:

  • P/E Ratio = Stock Price / Earnings Per Share (EPS)
  • Earnings Growth Rate = (Projected EPS - Current EPS) / Current EPS

PEG with Negative Growth

When a company experiences negative earnings growth, the standard PEG calculation becomes problematic because you're dividing by a negative number, which can lead to misleading results. Special handling is required in these cases.

There are two common approaches:

  1. Absolute Value Method: Take the absolute value of the growth rate in the denominator.
  2. Inverse Method: Use the reciprocal of the growth rate (1 / growth rate).

Note: Neither method is universally accepted, and investors should carefully consider which approach best reflects the company's financial situation.

How to Calculate PEG

To calculate PEG with negative growth:

  1. Calculate the P/E Ratio: Divide the current stock price by the company's earnings per share (EPS).
  2. Determine the earnings growth rate: Calculate the percentage change in EPS from the current period to the next.
  3. Apply the negative growth adjustment:
    • For Absolute Value Method: Use |Growth Rate| in the denominator.
    • For Inverse Method: Use 1 / Growth Rate in the denominator.
  4. Divide the P/E Ratio by the adjusted growth rate to get the PEG Ratio.

PEG Ratio (Negative Growth) = (P/E Ratio) / |Growth Rate|

or

PEG Ratio (Negative Growth) = (P/E Ratio) / (1 / Growth Rate)

Interpreting Results

The interpretation of PEG with negative growth depends on the method used:

  • Absolute Value Method:
    • PEG > 1: Stock may be overvalued relative to negative growth
    • PEG = 1: Stock may be fairly valued
    • PEG < 1: Stock may be undervalued relative to negative growth
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    • Inverse Method:
      • PEG > 1: Stock may be overvalued (growth is very negative)
      • PEG = 1: Stock may be fairly valued
      • PEG < 1: Stock may be undervalued (growth is not as negative)

    Remember that PEG with negative growth should be interpreted with caution, as it reflects a company in financial distress. Investors should consider other factors before making investment decisions.

Worked Examples

Example 1: Absolute Value Method

Company XYZ has:

  • Stock Price = $20
  • EPS = $2
  • Projected EPS = $1.5 (negative growth of 25%)

Calculation:

  1. P/E Ratio = $20 / $2 = 10
  2. Growth Rate = ($1.5 - $2) / $2 = -0.25 or -25%
  3. PEG = 10 / |-0.25| = 10 / 0.25 = 40

Interpretation: A PEG of 40 suggests the stock may be overvalued relative to its negative growth.

Example 2: Inverse Method

Using the same numbers:

  1. P/E Ratio = 10
  2. Growth Rate = -0.25
  3. PEG = 10 / (1 / -0.25) = 10 / -4 = -2.5

Interpretation: A negative PEG suggests the stock may be undervalued relative to its negative growth.

Comparison of Methods
Method PEG Result Interpretation
Absolute Value 40 Overvalued
Inverse -2.5 Undervalued

FAQ

Why is PEG with negative growth important?
PEG with negative growth helps investors assess whether a stock is appropriately priced given the company's financial distress. It provides a more nuanced view than the standard PEG ratio.
Which method is more accurate?
There is no universally accepted method. The Absolute Value method is more common but may not fully capture the financial situation. Investors should choose the method that best fits their investment strategy.
Can PEG with negative growth be used for all companies?
PEG with negative growth is most useful for companies experiencing financial difficulties. For growing companies, the standard PEG ratio is more appropriate.
What are the limitations of PEG with negative growth?
The interpretation depends on the chosen method, and neither method is perfect. Investors should consider other valuation metrics and company fundamentals when making decisions.
How often should I recalculate PEG with negative growth?
PEG with negative growth should be recalculated whenever there are significant changes in the company's financial situation or market conditions.