How to Value a Stock: A Practical Guide to Stock Valuation Methods

Price versus value: what you are estimating

The share price is what the market will pay today. Intrinsic value is your estimate of what the business is worth to a long-term owner, based on the cash it can generate. Valuation is the work of estimating the second and comparing it with the first.

Two definitions keep the arithmetic straight:

• Equity value (market capitalization) = share price × diluted shares outstanding. This is what shareholders own.
• Enterprise value (EV) = equity value + debt − cash, plus preferred stock and minority interests where they exist. This is the value of the whole operating business, owed to lenders and shareholders together.

Match numerators to denominators. Figures that belong to all capital providers, such as EBITDA, operating income and unlevered free cash flow, pair with enterprise value. Figures that belong only to shareholders, such as net income and earnings per share, pair with equity value or the share price. Mixing them, for example dividing market cap by EBITDA, makes indebted companies look cheaper than they are.

Stock valuation methods compared

Most stock valuation methods fall into two families. Absolute methods estimate value from the company's own cash flows. Relative methods price the company off what the market pays for similar businesses. Each answers a slightly different question.

Method	What it needs	Works best for	Main weakness
Discounted cash flow (DCF)	Free cash flow forecast, discount rate, terminal growth	Businesses with positive, reasonably predictable cash flow	Very sensitive to long-term assumptions
Price-to-earnings (P/E)	Earnings per share; peer or historical multiples	Stable, profitable companies with close peers	Distorted by cyclical peaks, one-off items and buybacks
EV/EBITDA	Enterprise value, EBITDA	Comparing companies with different debt levels	Ignores capital spending, taxes and stock-based pay
Price-to-free-cash-flow	Market cap, free cash flow	Mature, cash-generative companies	Lumpy capital spending distorts single years
Dividend discount model	Dividend forecast, cost of equity	Utilities and other steady payers	Of little use when payouts are small or irregular
Price-to-book	Book value per share	Banks and insurers, whose assets are mostly financial	Weak for asset-light firms whose value is intangible
Reverse DCF	Current price, discount rate, terminal assumptions	Checking what the market already assumes	Shows the bar, not whether it will be cleared

No method is best in every case. A DCF forces you to state every assumption; multiples tell you what investors are paying right now. When the two disagree sharply, explain the gap before you trust either.

How to value a stock in six steps

1. Understand how the business makes money. Read the business description and segment notes in the annual report (Form 10-K for US companies). You cannot forecast what you cannot explain.
2. Gather and clean the financials. Pull at least five years of revenue, operating margin, capital spending and free cash flow. Strip out one-off items, and treat stock-based compensation as the real cost it is, even though it is non-cash. A company page such as /company/AAPL shows SEC-sourced statements in one place.
3. Forecast free cash flow. Free cash flow = operating cash flow − capital expenditures. For a firm-level DCF use unlevered free cash flow, before interest. Forecast five to ten years, letting growth fade toward the rate of the wider economy.
4. Choose a discount rate. For firm-level cash flow, use the weighted average cost of capital (WACC): the blended return lenders and shareholders require. Riskier, more indebted or less predictable businesses deserve a higher rate. Be consistent across the companies you compare.
5. Estimate the terminal value. Terminal value = FCFₙ₊₁ / (r − g), where g is the growth you expect forever. g must be below r and should not exceed long-run nominal economic growth; 2% to 3% is a common, conservative choice.
6. Convert to a value per share and compare. Enterprise value − net debt = equity value; divide by diluted shares. Cross-check with multiples and ask what the gap between value and price implies.

One formula ties the steps together:

Intrinsic value (enterprise) = Σ FCFₜ / (1 + r)ᵗ + TV / (1 + r)ⁿ

Here FCFₜ is free cash flow in year t, r is the discount rate, n is the final forecast year and TV is the terminal value at year n.

Worked example: a simple DCF (illustrative)

The numbers below are hypothetical and rounded to show the mechanics, so totals can differ slightly from the sum of the rows. They describe no real company.

Assume a company produced $100 million of unlevered free cash flow last year. You expect 8% annual growth for five years, a 9% discount rate and 2.5% growth forever after. It has $200 million of net debt and 50 million diluted shares, and the stock trades at $30.

Year	Free cash flow ($m)	Divide by (1.09)ᵗ	Present value ($m)
1	108.0	1.090	99.1
2	116.6	1.188	98.2
3	126.0	1.295	97.3
4	136.0	1.412	96.4
5	146.9	1.539	95.5
Total			486.4

• Year-6 free cash flow = 146.9 × 1.025 = $150.6 million.
• Terminal value at year 5 = 150.6 / (0.09 − 0.025) = $2,317 million.
• Present value of the terminal value = 2,317 / 1.539 = $1,506 million.
• Enterprise value = 486 + 1,506 = $1,992 million.
• Equity value = 1,992 − 200 = $1,792 million, or about $35.85 per share.

Two lessons sit inside this example. First, the terminal value is about 76% of the enterprise value, so most of the answer depends on what happens after year five. Second, the output is fragile. Small changes to the two long-run inputs move the value per share from about $29 to $47:

Discount rate	Terminal growth 2.0%	Terminal growth 2.5%	Terminal growth 3.0%
8%	$40.00	$43.27	$47.20
9%	$33.56	$35.85	$38.52
10%	$28.73	$30.40	$32.32

The range straddles the $30 price. That is why a single DCF figure should never be read as precise.

Cross-checking with valuation multiples

Multiples compress a valuation into one ratio: the price paid per unit of earnings, cash flow, sales or book value. They are quick and they reflect what the market pays today, but they borrow the peer group's assumptions, good or bad.

A simple relative valuation (illustrative): if comparable companies trade at 15 times forward earnings and your company is expected to earn $2.40 per share, a peer-based value is 15 × $2.40 = $36. Before accepting it, ask whether the company deserves the peer multiple. Faster growth, higher returns on capital and less debt justify a higher one; the opposite justifies a lower one.

When each multiple misleads

• P/E on cyclicals. Steelmakers, chipmakers and homebuilders often look cheapest on P/E when earnings are at a peak and about to fall, and most expensive near the bottom. Use mid-cycle earnings or price-to-book instead.
• EV/EBITDA on capital-heavy firms. EBITDA ignores the spending needed to maintain the business. Check EV/EBIT or price-to-free-cash-flow as well.
• Adjusted earnings. Company-defined "adjusted" figures often exclude stock-based compensation and restructuring charges that recur every year.
• The PEG ratio. Dividing P/E by the growth rate assumes value rises in a straight line with growth, ignoring how long the growth lasts and how much capital it consumes.

Compare a multiple with the company's own history and with its peers, and write down why it should sit above or below both.

Flip the question: what is the price assuming?

A forward DCF asks what the stock is worth given your forecast. A reverse DCF asks what forecast the current price already implies. You keep the discount rate and terminal assumptions, then solve for the growth rate that makes the model equal the market price.

In the illustrative example above, the $30 price implies free cash flow growth of only about 4% a year for five years, roughly half the 8% assumed. If 8% is realistic, the price looks undemanding. If growth has been running nearer 3% with no sign of speeding up, the same price looks fair to full. This framing is often more useful than a point estimate because it gives you one number to argue with. VALYSTR's Belief Gap sets the growth a price implies against what analyst forecasts expect.

Common valuation mistakes

• Letting terminal value do all the work. If 80% or more of the value sits in the terminal value, the forecast years are doing little. Check the multiple of final-year cash flow that your terminal assumptions imply.
• Terminal growth too close to the discount rate. As g approaches r, the formula heads toward infinity. A gap of three percentage points already values the business at about 33 times the next year's cash flow.
• Mismatched cash flows and rates. Discount unlevered free cash flow at WACC and then subtract net debt. Discount levered free cash flow, after interest, at the cost of equity and do not subtract debt a second time.
• Ignoring dilution. Use diluted shares and count stock-based compensation as a cost, or the value per share will be overstated.
• Confusing cheap with undervalued. A low multiple can reflect a shrinking business, a cyclical peak or a strained balance sheet. The stock screener guide covers how to spot value traps.
• False precision. Reporting a value to the cent from inputs you know only roughly. Round, and think in ranges.
• Anchoring on the price. Adjusting assumptions until the model lands near the market price defeats the purpose of building it.

From estimate to decision: ranges and margin of safety

Because every input is uncertain, build three cases rather than one:

• Bear: growth fades faster, margins compress and the discount rate is higher.
• Base: your best estimate, consistent with the company's history and its industry.
• Bull: the plan works, margins expand and growth lasts longer.

Then apply a margin of safety: require the price to sit meaningfully below your base-case value, so that ordinary forecasting errors do not turn into losses. Margin of safety = (intrinsic value − price) / intrinsic value. In the illustrative example, ($35.85 − $30) / $35.85 ≈ 16%. How much margin to require is a personal judgment, and it should grow with the uncertainty of the business.

A stock valuation calculator speeds up the arithmetic, but the assumptions remain yours. VALYSTR's Stock Analyzer lets you enter or load a company's financials, build bear, base and bull scenarios and run stress tests, and Buy Zone turns your assumptions into a price range. Finally, write down what must stay true for the valuation to hold, as the investment thesis guide describes, and revisit it after each earnings report.