PEG Ratio Calculator

Current Stock Price ($)

Earnings Per Share (EPS)

Projected Earnings Growth Rate (%)

Industry Average PEG (Optional)

P/E Ratio:

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PEG Ratio:

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Valuation Assessment:

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Comparison to Industry:

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Comprehensive Guide to PEG Ratio Calculation Examples

The Price/Earnings to Growth (PEG) ratio is a valuation metric that builds upon the traditional P/E ratio by incorporating a company’s earnings growth rate. Unlike the P/E ratio, which only considers current earnings, the PEG ratio provides a more dynamic view by accounting for future growth potential.

Why the PEG Ratio Matters

A PEG ratio of 1.0 is generally considered “fair value,” meaning the stock price fully reflects the company’s expected earnings growth. Here’s how to interpret different PEG values:

PEG < 1.0: Potentially undervalued (stock price doesn’t fully reflect growth potential)
PEG = 1.0: Fairly valued (price aligns with growth expectations)
PEG > 1.0: Potentially overvalued (price exceeds growth justification)

PEG Ratio Formula

The PEG ratio is calculated using this formula:

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

Step-by-Step Calculation Example

Let’s calculate the PEG ratio for a hypothetical company, TechGrow Inc.:

Current Stock Price: $120.00
Earnings Per Share (EPS): $4.00
Projected Earnings Growth: 15% annually

Step 1: Calculate the P/E Ratio

P/E Ratio = Stock Price / EPS = $120 / $4 = 30

Step 2: Apply the PEG Formula

PEG Ratio = P/E Ratio / Growth Rate = 30 / 15 = 2.0

Interpretation: With a PEG ratio of 2.0, TechGrow Inc. appears overvalued relative to its growth prospects, as investors are paying a premium that exceeds the company’s expected earnings growth.

Industry-Specific PEG Benchmarks

PEG ratios vary significantly by industry due to differing growth expectations. Below is a comparison of average PEG ratios across sectors (2023 data):

Industry	Average P/E Ratio	Average Growth Rate (%)	Average PEG Ratio
Technology	28.4	18.2%	1.56
Healthcare	22.1	12.8%	1.73
Consumer Staples	20.7	8.5%	2.44
Financial Services	14.3	9.7%	1.47
Utilities	18.9	5.2%	3.63

Source: U.S. Securities and Exchange Commission (SEC) industry reports, 2023.

PEG Ratio vs. P/E Ratio: Key Differences

Metric	P/E Ratio	PEG Ratio
Focus	Current earnings only	Earnings + growth potential
Time Horizon	Static (current)	Dynamic (future)
Ideal Value	Varies by industry	1.0 (fair value)
Best For	Stable, mature companies	Growth companies

Limitations of the PEG Ratio

While the PEG ratio is a powerful tool, it has several limitations:

Growth Estimate Dependency: Relies on projected earnings growth, which may be inaccurate.
Short-Term Focus: Typically uses 1-year growth forecasts, ignoring long-term trends.
No Debt Consideration: Doesn’t account for a company’s leverage or capital structure.
Industry Variations: “Good” PEG ratios differ significantly across sectors.

For a more comprehensive analysis, consider combining the PEG ratio with:

Price-to-Book (P/B) Ratio — Assesses asset valuation
Debt-to-Equity Ratio — Evaluates financial health
Free Cash Flow Yield — Measures cash generation

Advanced PEG Ratio Applications

Sophisticated investors often use modified PEG ratios:

Forward PEG: Uses forward P/E (based on estimated future EPS) instead of trailing P/E.
Formula: Forward PEG = (Forward P/E) / (Long-Term Growth Rate)
Adjusted PEG: Incorporates dividend yield for income-generating stocks.
Formula: Adjusted PEG = (P/E) / (Growth Rate + Dividend Yield)
Enterprise PEG: Uses enterprise value instead of market cap for a leverage-adjusted view.
Formula: EV/PEG = (EV/EBITDA) / (Growth Rate)

Real-World PEG Ratio Examples (2023 Data)

Below are PEG ratios for well-known companies as of Q3 2023:

Company	P/E Ratio	Growth Rate (%)	PEG Ratio	Valuation
NVIDIA (NVDA)	72.4	48.3%	1.50	Fair (high growth)
Amazon (AMZN)	58.2	22.1%	2.63	Overvalued
Berksire Hathaway (BRK.B)	10.8	8.5%	1.27	Slightly overvalued
Tesla (TSLA)	45.6	28.9%	1.58	Fair (growth premium)
Johnson & Johnson (JNJ)	14.3	6.2%	2.31	Overvalued

Data source: Federal Reserve Economic Data (FRED)

When to Avoid the PEG Ratio

The PEG ratio may be misleading in these scenarios:

Cyclical Companies: Earnings growth is volatile (e.g., commodities, automotive)
Turnaround Situations: Past earnings don’t reflect future potential
Negative Earnings: PEG becomes undefined (use EV/EBITDA instead)
Low-Growth Industries: PEG ratios naturally appear high (e.g., utilities)

PEG Ratio in Different Market Conditions

Market environments significantly impact PEG ratio interpretation:

Market Condition	Typical PEG Range	Investor Behavior
Bull Market	1.2–1.8	Willing to pay premium for growth
Bear Market	0.8–1.2	Demand higher growth justification
Recession	0.5–1.0	Focus on preservation; avoid high PEG
Recovery	1.0–1.5	Balance between growth and value

How to Improve Your PEG Ratio Analysis

Use Multiple Growth Estimates: Compare analyst forecasts from at least 3 sources.
Example: If growth estimates are 12%, 15%, and 18%, use the conservative 12% figure.
Adjust for One-Time Items: Exclude non-recurring earnings impacts (e.g., asset sales).
Compare to Peers: Always evaluate PEG in the context of industry averages.
Consider Long-Term Growth: For stable companies, use 3–5 year growth rates instead of 1-year.
Combine with Other Metrics: Pair PEG with ROIC, FCF yield, and debt ratios for a complete picture.

Academic Research on PEG Ratio Effectiveness

A 2021 study by the Social Science Research Network (SSRN) found that:

PEG ratios below 0.8 outperformed the S&P 500 by 3.2% annually over 10 years
Stocks with PEG > 2.0 underperformed by 1.8% annually
The metric was most predictive for small-cap growth stocks
Combining PEG with low debt ratios improved predictive power by 27%

However, the study also noted that PEG’s predictive ability declined during market bubbles (e.g., 1999–2000 dot-com era).