PE Ratio
The Price-to-Earnings (P/E) ratio is the most widely used valuation metric. It tells you how much investors pay for each rupee of earnings.
P/E ratio answers the question: "How many years of current earnings would it take to pay back my investment?"
What is P/E Ratio?
PE Ratio = Market Price per Share / Earnings per Share (EPS)
Example:
- Stock price: ₹500
- EPS: ₹25
- P/E = 500 / 25 = 20x
This means investors pay ₹20 for every ₹1 of annual earnings.
How to Interpret P/E
| P/E Range | General Interpretation |
|---|---|
| Under 10 | Potentially undervalued or troubled |
| 10-20 | Fair value for mature companies |
| 20-30 | Growth premium |
| Over 30 | High growth expectations |
| Negative | Company is loss-making |
P/E without context is meaningless. A 50 P/E for a fast-growing company might be cheap, while 15 P/E for a declining company might be expensive.
Types of P/E
Trailing P/E (TTM)
Based on last 12 months' earnings:
- Uses actual, reported numbers
- Backward-looking
- Most commonly quoted
Forward P/E
Based on expected future earnings:
- Uses analyst estimates
- Forward-looking
- More relevant for valuation
- Can be wrong
Compare trailing P/E to forward P/E. If forward is much lower, analysts expect earnings to grow. If higher, earnings might decline.
What P/E Tells You
1. Market Expectations
High P/E = Market expects high growth Low P/E = Market expects low or no growth
2. Relative Value
Compare P/E with:
- Same company's historical P/E
- Industry peers
- Market average (Nifty 50 P/E)
3. Payback Period
P/E of 20 = 20 years to earn back your investment at current earnings (without growth)
P/E Limitations
| Limitation | Why It Matters |
|---|---|
| Ignores growth | Two companies at 20 P/E with different growth rates aren't equal |
| Accounting sensitive | Earnings can be manipulated |
| Industry differences | Tech companies naturally trade at higher P/E than utilities |
| Cyclical distortion | At peak earnings, P/E is low; at trough, P/E is high |
| Doesn't work for losses | Can't calculate P/E for loss-making companies |
Industry P/E Benchmarks
| Industry | Typical P/E Range |
|---|---|
| IT Services | 20-35x |
| FMCG | 40-60x |
| Banks | 10-20x |
| Pharma | 25-40x |
| Auto | 15-25x |
| Metals/Mining | 5-15x |
Using P/E Wisely
Compare Apples to Apples
Don't compare:
- TCS (IT) to Tata Steel (Metal)
- ITC (FMCG) to HDFC Bank (Financial)
Look at Historical Range
| Current P/E vs History | Signal |
|---|---|
| Above historical average | Potentially overvalued |
Consider Growth
PEG Ratio = P/E / Earnings Growth Rate
| PEG | Interpretation |
|---|---|
| Under 1 | Undervalued relative to growth |
| 1 | Fairly valued |
| Over 1 | Overvalued relative to growth |
Key Takeaways
- P/E = Price ÷ EPS – shows what you pay per rupee of earnings
- Context matters – compare to peers and history
- High P/E means high expectations
- Trailing uses past earnings; Forward uses estimates
- P/E alone isn't enough – consider growth rate
Next: Price-to-Book ratio – another essential valuation metric.
Sources & Disclaimer
- ICAI Financial Reporting Standards
- Companies Act 2013 - Financial Statement Formats
Note: Any benchmarks (e.g., "Good ROE is > 20%", or specific P/E ranges) are simplified industry heuristics for educational purposes. True evaluation depends on specific industry context, market cycles, and individual company circumstances.