How to Value a Stock: A Practical Guide for Individual Investors
The question that sits at the heart of every investment decision — Is this stock cheap or expensive? — sounds simple. It is not simple. But it is answerable, with the right tools and the right frame of mind.
Most investors approach valuation backwards. They look at a price chart, develop an emotional relationship with the direction it's moving, and then construct a valuation rationale that supports what they already feel. Rising prices feel like confirmation; declining prices feel like danger signals. The entire exercise is rationalization dressed up as analysis.
Proper valuation runs in the opposite direction. You estimate what the business is worth. Then you compare that estimate to the current price. The gap between the two — and the direction of that gap — tells you what action, if any, makes sense.
Why valuation matters
Valuation is not about predicting stock prices. It is about managing the price you pay.
A great business bought at a terrible price will underperform. A mediocre business bought at an extraordinary bargain will outperform. This is not a hypothesis — it is documented across multiple decades of market history. Valuation at entry is one of the strongest predictors of long-run investment returns, which is why it occupies the center of every serious investing framework from Graham to Buffett to Klarman.
The corollary is equally important: valuation is always relative to price. A business can be outstanding and still be a poor investment if the stock price already reflects — or exceeds — its fair value. The business and the stock are not the same thing.
The P/E method
The price-to-earnings ratio is the most common starting point for valuation, and with good reason: it's simple, widely available, and usually tells you something true about relative value.
P/E = Stock Price / Earnings Per Share
The practical question is: what P/E is fair for this specific business? The answer isn't "10 is cheap and 30 is expensive" as an absolute rule — it's what's typical for this company given its growth rate, competitive position, and capital intensity.
The most useful application of P/E is comparing a stock to its own history. If a business has traded between 14x and 22x earnings for the past decade and is currently at 12x, that's potentially interesting — either something has changed, or the market is being irrationally pessimistic. If the same business is at 28x, you need a strong reason to believe the next decade will be materially better than the last.
Growth rate matters too. A simple way to adjust for growth is the PEG ratio — P/E divided by the expected earnings growth rate. A P/E of 25 with 25% earnings growth is not the same as a P/E of 25 with 5% earnings growth. The former might be reasonable; the latter is almost certainly overpriced.
Where P/E fails: cyclical businesses, companies with negative earnings, and any business where accounting choices create a significant gap between reported earnings and economic reality. For those, move to the method below.
The P/FCF method
Price-to-free-cash-flow uses the same structure as P/E but substitutes free cash flow — operating cash flow minus capital expenditures — for earnings.
P/FCF = Stock Price / Free Cash Flow Per Share
FCF is harder to manipulate than net income. It bypasses most accounting choices. For capital-intensive businesses, it captures the true reinvestment burden that depreciation accounting often understates. For businesses with significant non-cash charges (stock-based compensation, amortization of acquired intangibles), FCF tells you what the business actually generates in cash for its owners.
The P/FCF method is The Ledger Terminal's default valuation metric for exactly these reasons. On the valuation chart, the fair value line is derived from the company's historical median P/FCF multiple applied to its trailing free cash flow — giving you an estimate of what the business would be worth if the market valued it at typical historical levels.
For asset-light businesses — software, consumer brands, professional services — P/E and P/FCF often tell similar stories. For capital-intensive businesses, they can diverge dramatically, and P/FCF is the more honest number.
The concept of fair value
Fair value, as used on The Ledger Terminal, is not a prediction. It is an estimate: what the stock would be worth if the market valued it at the company's own median historical multiple applied to current fundamentals.
The fair value line on every stock chart is derived from a specific calculation: take the company's trailing earnings or free cash flow per share, multiply by the company's historical median valuation multiple, and that's the fair value estimate for today's price. Simple, transparent, anchored in the company's actual history rather than a DCF model loaded with assumptions.
This approach has several advantages. It requires no forecasting. It's automatically calibrated to each company's industry, growth profile, and risk characteristics — a mature consumer staples company will have a different median multiple than a high-growth software business, and fair value will reflect that. And because it uses the company's own history rather than market averages, it gives you a meaningful reference point even as markets fluctuate.
The limitation is also worth being clear about: fair value based on historical multiples assumes the future will resemble the past. If a business is undergoing genuine transformation — accelerating growth, expanding into new markets, or conversely deteriorating from a once-durable competitive position — historical multiples may not apply. That's a judgment call you have to make with full knowledge of the business.
Mean reversion: the engine underneath valuation
Over the long run, stock prices and fair values tend to converge. Stocks that trade significantly above fair value tend to underperform in subsequent years. Stocks that trade significantly below fair value tend to outperform. This is mean reversion, and it's the closest thing to a reliable law that exists in equity markets.
The mechanism is intuitive. When a stock trades at a large premium to its intrinsic value, future returns depend on the business growing into that premium — earnings must rise substantially to justify the elevated price, or the multiple will eventually compress. When a stock trades at a discount, even modest growth — or simply a return to normal sentiment — generates strong returns.
Mean reversion doesn't work on any particular schedule. Expensive stocks can stay expensive for years. Cheap stocks can stay cheap longer than any rational investor expects. The discipline isn't about calling turning points; it's about ensuring that time and fundamentals are working in your favor rather than against you.
On the valuation chart, the gap between the price line and the fair value line shows you exactly where you are relative to historical valuation. A wide gap in either direction is a signal worth investigating — though never a conclusion.
Why log-scale charts matter
Most stock charts use a linear price scale. This creates an optical illusion that distorts your perception of long-run performance.
On a linear scale, a stock rising from $10 to $20 looks the same as a stock rising from $100 to $110 — both moves measure two centimeters on the y-axis. But the first move is a 100% gain; the second is 10%. The linear scale systematically overstates the apparent performance of high-priced stocks and understates the performance of early compounders.
A logarithmic scale fixes this. On a log scale, equal vertical distances represent equal percentage changes — a doubling from $10 to $20 takes the same vertical space as a doubling from $100 to $200. This makes the long-run compounding picture accurate and allows you to meaningfully compare the trajectory of the fair value line to the trajectory of the stock price across fifteen years.
The valuation charts on The Ledger Terminal use log scale by default for exactly this reason. When you're evaluating Alphabet or any other compounding business over a decade, you want to see the percentage gains, not the dollar gains.
When cheap is not good enough
This is the part of the valuation conversation that textbooks often skip.
A stock can be cheap on every metric — low P/E, low P/FCF, trading below book value — and still be a terrible investment. Value traps exist. A business that is genuinely deteriorating — losing market share, watching its competitive advantage erode, facing structural disruption — will show declining fundamentals year after year. The "cheap" multiple is cheap for a reason: the market is pricing in further deterioration.
The check against this is ROIC. Return on invested capital tells you how good the business actually is — not how cheap the stock looks. A business with declining ROIC, even trading at 8x earnings, is not obviously cheap. The earnings denominator may be about to shrink. A business with high and stable ROIC, even at 20x earnings, might be genuinely undervalued if the quality of the earnings justifies the multiple.
The screener lets you filter simultaneously on valuation (P/E, P/FCF) and quality (ROIC, gross margin, earnings consistency). Running both together is the starting point for finding businesses that are cheap and good — the combination that produces strong long-run results.
A practical valuation workflow
When you're evaluating any stock, run through this sequence:
1. Assess business quality first. Is ROIC high and stable? Are margins durable? Is the business growing? If the business isn't good, the valuation question is moot for most investors.
2. Look at the valuation chart. Is the price above, below, or near fair value? What's the historical range been? How wide is the current gap?
3. Check trailing P/E and P/FCF. Are both telling the same story? If they diverge, understand why. Check both against the company's own 10-15 year history.
4. Estimate the FCF yield. Divide FCF per share by the stock price. Is it competitive with other investment alternatives given the growth rate?
5. Ask what growth the current price assumes. A stock at 30x FCF needs a compelling growth story. Can the business realistically grow FCF fast enough to justify the price, even without any multiple expansion?
6. Consider the ROIC-WACC spread. High-ROIC businesses that reinvest at returns well above their cost of capital deserve premium multiples. The premium is justified by the compounding math. The question is how much premium.
Valuation is always an estimate. You will not pinpoint the exact intrinsic value of any business, and claiming precision where none exists is its own kind of error. The goal is to develop a well-reasoned range, identify where the current price sits relative to that range, and act when the gap is large enough to provide genuine margin of safety.
That margin of safety is not just about downside protection. It's about giving yourself room to be wrong — about the business, about the macro environment, about factors you can't foresee — and still earn a reasonable return. When you buy far enough below a conservative estimate of value, you don't need things to go perfectly. You just need them to go well enough.
Every number you need for this analysis — fifteen years of earnings, FCF, ROIC, margins, the valuation chart, and the screener — is available on The Ledger Terminal, extracted directly from SEC filings with no third-party interpretation between the source and the data you see.