PEG Ratio Calculator
Valuation Analysis for Growth-Oriented Investors
2.00
Fairly Valued
30.00
3.33%
15.00
Valuation Visualizer
This chart maps the peg ratio calculator output onto a valuation spectrum.
What is a PEG Ratio Calculator?
The peg ratio calculator is a specialized financial tool used by investors to determine the relative value of a stock while accounting for its earnings growth. Unlike the standard Price-to-Earnings (P/E) ratio, which only looks at current earnings, the PEG ratio provides a more complete picture by factoring in how fast the company is expected to grow.
Investors use this peg ratio calculator to identify “growth at a reasonable price” (GARP). A company might have a high P/E ratio, suggesting it is expensive, but if its growth rate is also extremely high, the peg ratio calculator might reveal that the stock is actually undervalued.
Who Should Use It?
- Growth Investors: To find companies expanding rapidly without paying an excessive premium.
- Value Investors: To ensure that “cheap” stocks aren’t just value traps with zero growth.
- Financial Analysts: To compare companies within the same industry that have different growth profiles.
PEG Ratio Formula and Mathematical Explanation
The math behind our peg ratio calculator is straightforward but powerful. It involves two primary steps: calculating the P/E ratio and then dividing that by the annual growth rate.
The Formula:
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Price | Current market price of one share | USD ($) | $1 – $500,000+ |
| EPS | Earnings per share (Net Income / Shares) | USD ($) | $0.01 – $100+ |
| Growth Rate | Expected annual percentage growth | Percent (%) | 5% – 40% |
| P/E Ratio | Price divided by Earnings | Ratio | 10x – 50x |
Practical Examples (Real-World Use Cases)
Example 1: High Growth Tech Stock
Imagine a tech company trading at $200 with an EPS of $4.00. Its P/E ratio is 50. At first glance, this seems expensive. However, the company is expected to grow earnings by 50% next year. Using the peg ratio calculator:
- P/E Ratio: 50
- Growth Rate: 50
- PEG Ratio: 50 / 50 = 1.00
Interpretation: The stock is considered fairly valued because its high price is perfectly offset by its high growth.
Example 2: Slow Growth Utility
A utility company trades at $50 with an EPS of $5.00. Its P/E ratio is only 10. However, its earnings are only expected to grow by 2% annually. Using the peg ratio calculator:
- P/E Ratio: 10
- Growth Rate: 2
- PEG Ratio: 10 / 2 = 5.00
Interpretation: Even though the P/E is low, the stock is significantly overvalued relative to its very slow growth.
How to Use This PEG Ratio Calculator
- Enter the Stock Price: Input the current trading price from any financial news site.
- Enter the EPS: You can use Trailing Twelve Months (TTM) EPS for a backward-looking PEG or Forward EPS for a forward-looking PEG.
- Enter the Growth Rate: Input the estimated growth rate (use the number, e.g., “20” for 20%). Analysts’ estimates on sites like Yahoo Finance are good sources.
- Analyze the Results: The peg ratio calculator will instantly show the PEG, P/E, and a visual valuation chart.
- Copy Results: Use the copy button to save your analysis for your investment journal.
Key Factors That Affect PEG Ratio Results
When using a peg ratio calculator, it is vital to understand the variables that influence the outcome:
- Growth Estimate Accuracy: The PEG is only as good as the growth forecast. If a company fails to meet its 20% growth target, a “cheap” PEG of 0.8 could instantly become an “expensive” PEG of 2.0.
- Interest Rates: High interest rates generally lead to lower P/E ratios across the market, which lowers the PEG. When rates fall, PEGs tend to expand.
- Industry Norms: Tech companies often have higher acceptable PEGs than manufacturing companies due to scalability.
- Inflation: High inflation can erode the real value of future earnings growth, making high PEG stocks riskier.
- Dividend Yield: Some versions of the formula (PEGY ratio) add dividend yield to the growth rate. A company with 5% growth and a 5% dividend is more valuable than one with just 5% growth.
- Risk and Volatility: A company with predictable 10% growth is often valued more highly than a cyclical company with 20% average growth that fluctuates wildly.
Frequently Asked Questions (FAQ)
What is a “good” result on the peg ratio calculator?
Traditionally, a PEG ratio of 1.0 is considered “fair value.” Below 1.0 is considered undervalued, and above 1.0 (specifically above 2.0) is considered overvalued.
Can a PEG ratio be negative?
Yes, if a company has negative earnings or a negative growth rate. However, a negative peg ratio calculator result is usually considered “not meaningful” (N/M) for valuation purposes.
Should I use Forward or Trailing EPS?
Forward EPS is better for valuing future potential, while Trailing EPS is better for seeing how the company has actually performed. Many investors use both.
Why not just use the P/E ratio?
The P/E ratio ignores growth. A company with a P/E of 20 and 0% growth is much more expensive than a company with a P/E of 30 and 40% growth.
Does the PEG ratio work for all stocks?
It works best for growth stocks. It is less effective for cyclical companies (like oil) or mature companies with stagnant growth but high dividends.
How long of a growth period should I use?
Most peg ratio calculator users look at a 3-to-5-year expected compound annual growth rate (CAGR).
Where do I find growth rate estimates?
Financial websites like Bloomberg, Reuters, and Yahoo Finance aggregate “Consensus Analyst Estimates” which provide these percentages.
What is the difference between PEG and PEGY?
PEGY adds the dividend yield to the growth rate in the denominator, which is fairer for mature companies that return cash to shareholders.
Related Investment Tools
- Stock Profit Calculator – Calculate your total returns including capital gains and dividends.
- Dividend Reinvestment Calculator – See how compounding dividends can accelerate your portfolio growth.
- Compound Interest Calculator – The fundamental tool for long-term wealth projection.
- ROI Calculator – Measure the efficiency of any investment or business venture.
- Future Value Calculator – Estimate what your current savings will be worth in the future.
- Break-Even Analysis Tool – Determine when an investment starts generating a net profit.