Stock valuation is the process of determining a stock's fair value. The two main approaches are intrinsic valuation (DCF) and relative valuation (comparables using PE, PB, etc.).
A stock with PE of 15 vs industry average of 20 may be undervalued. DCF analysis might show fair value at $60 vs current $45. Both suggest the stock is cheap.
No single method is perfect. Use multiple valuation approaches for confidence. PE is simplest; DCF is most thorough. Always compare within the same industry and consider growth rates. Think of valuation as a range, not a single number — different methods give different answers, and the overlap is where the truth lies.
There are two fundamental approaches to valuation, each with multiple techniques:
| Method | Type | Best For | Key Input | Limitation |
|---|---|---|---|---|
| DCF | Intrinsic | Stable, predictable companies | Future cash flows + discount rate | Highly sensitive to assumptions |
| PE Ratio | Relative | Profitable companies | Earnings + peer comparison | Useless for unprofitable companies |
| P/S Ratio | Relative | High-growth, pre-profit | Revenue + industry avg | Ignores profitability |
| EV/EBITDA | Relative | M&A, capital-intensive | Enterprise value + operating profit | Complex, ignores tax differences |
| P/B Ratio | Relative | Banks, financials, asset-heavy | Book value per share | Meaningless for asset-light tech |
| Dividend Discount | Intrinsic | Mature dividend payers | Dividends + growth rate | Only works for dividend payers |
Let's value a hypothetical mid-cap tech company with $2B revenue, $200M net income, 100M shares outstanding, and a current stock price of $45:
Valuation range: $50-55 (excluding the $100 outlier). Current price of $45 suggests ~15% undervaluation.
💡 Pro Tip: The Margin of Safety
Benjamin Graham (Warren Buffett's mentor) insisted on a "margin of safety" — only buy when the stock is trading at a significant discount to your calculated fair value. A common rule: require a 20-30% discount. If your valuation says $50, wait for $35-40. This buffer protects you from estimation errors, unforeseen problems, and market volatility. It's better to miss a good stock than to overpay for a mediocre one.
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Try PE Ratio Calculator →What are the main valuation methods?
Three main approaches: (1) Comparable analysis — comparing PE, PB, EV/EBITDA to similar companies, (2) DCF (Discounted Cash Flow) — projecting future cash flows and discounting to present value, (3) Precedent transactions — what acquirers paid for similar companies. Most analysts use multiple methods and triangulate.
Why do different analysts get different valuations?
Valuation involves assumptions about growth rates, discount rates, margins, and competitive dynamics — all subjective. Two analysts using the same DCF model can get wildly different results by changing the growth assumption from 8% to 12%. This is why valuation is called an art, not a science.
Is a cheap valuation always a buying opportunity?
No. Low valuations can be "value traps" — stocks that look cheap but keep getting cheaper. This happens when the market correctly anticipates declining earnings, industry disruption, or management problems. Always ask WHY a stock is cheap before assuming the market is wrong.