What stock valuation actually is
A stock's price is what the market says it's worth right now. Its value is what the business will actually earn for its owners over time. Valuation is the bridge between the two: estimate the value, compare it to the price, and you get one of three conclusions — overvalued, fairly priced, or potentially interesting.
Every method on this page is a different way of estimating the same thing. None is perfect; each fits a different kind of business. Professionals run two or more and look for agreement.
Method 1: Discounted Cash Flow (DCF)
The idea: a business is worth the sum of all the cash it will generate in the future, minus a discount for waiting and risk. Cash in 10 years is worth less than cash today, so each year's projection is "discounted" back to today's money.
- FCF — free cash flow the company generates each year
- r — discount rate (typically 8–12% for most public companies)
- Terminal value — the business's worth after your projection window, usually grown at a modest perpetual rate (2–3%)
Fits: cash-generative businesses with predictable economics — software, consumer brands, infrastructure.
Doesn't fit: early-stage companies with no cash flows yet, deep cyclicals, banks (different capital structure logic).
Honest weakness: the output is extremely sensitive to the growth and discount-rate assumptions. Change the growth rate from 4% to 6% and the fair value can move 30%+. That's why the calculator lets you stress-test both.
Method 2: Dividend Discount Model (DDM)
The idea: if a company pays you dividends forever, the stock is worth the present value of that dividend stream. It's the oldest valuation model in the book — and the simplest honest one.
Worked example: a stock pays a $2.00 dividend next year, dividends grow 4% a year, you demand a 9% return: $2.00 ÷ (0.09 − 0.04) = $40.00. If the market price is $32, the model says you're paying $32 for something worth $40 — a 20% margin of safety.
Fits: utilities, insurers, consumer staples — businesses with long, stable dividend histories.
Doesn't fit: companies that buy back stock instead of paying dividends, or don't pay them at all (most of tech).
Method 3: Relative Valuation (multiples)
The idea: don't value the business in isolation — price it against similar businesses. If comparable companies trade at 20× earnings, a similar-quality company at 14× may be cheap.
Worked example: a company earns $4.50 per share. Its industry's average P/E is 18× (look it up in the average P/E by industry table). Fair value ≈ $4.50 × 18 = $81.00. Market price $65 → potentially undervalued, if its growth matches the sector.
Fits: any industry with enough comparable public companies — which is most of them. Fastest of the three methods.
Doesn't fit: companies whose earnings are temporarily distorted, and industries where "comparable" is a stretch.
Critical rule: the P/E you use must come from the company's own industry. A 15× airline and a 35× software company can both be fairly priced. Cross-industry comparison is the single most common valuation error.
The 4-step process
- Understand the business. What does it sell, how does it make money, are earnings stable or cyclical? Ten minutes of reading the latest annual report summary beats an hour of spreadsheet work.
- Pick the method that fits. Cash-generative → DCF. Dividend payer → DDM. Has clean comparables → relative. When unsure, run two and compare.
- Run the numbers. Put earnings, growth and the industry multiple into the stock valuation calculator — it computes DCF, DDM and P/E-based values side by side, with a clear fair-value range.
- Compare with the market price — with a margin of safety. A valuation that says "fair value is 3% above the price" is noise. Look for a 25–50% gap and make sure you can explain where it comes from before acting on it.
6 mistakes that wreck a valuation
- Cross-industry P/E comparison. Solved by always pulling multiples from the industry table.
- Assuming last year's growth continues forever. Almost nothing compounds at 30% for a decade. Use conservative perpetual rates (2–3%).
- Using the wrong discount rate. Too low inflates every value; too low for a risky business is worse. 8–12% covers most cases; risky small-caps deserve the high end.
- Valuing on hope, not fundamentals. Check the business quality first with the industry benchmark ratios — margins, ROE, debt. Great numbers can't rescue a deteriorating business model.
- Point estimates. One number feels precise and is usually wrong. Always produce a range (optimistic / base / pessimistic) and see where the market price sits.
- Ignoring what the market already knows. A persistent 40% discount to fair value usually means the market sees a real problem. Find it before concluding you've found a bargain.
Keep the ratio definitions handy with the financial ratios cheat sheet — every input in these formulas is a ratio or a line item defined there.
Frequently asked questions
What are the 3 ways to value a stock?
Discounted cash flow (value the cash the business will generate), dividend discount model (value the dividends it will pay), and relative valuation (compare its multiples to industry peers). All three appear above with formulas and worked examples.
How do you calculate the value of a stock?
Quick version: EPS × justified P/E (from the industry average), compared with the market price. Deeper version: discount projected free cash flows back to today. The calculator does both in one place.
What is the best stock valuation method?
There isn't one. DCF is most complete but most assumption-sensitive; DDM is simplest but only fits dividend payers; relative valuation is fastest but only as good as your comparables. Run two and look for agreement.
How do you know if a stock is undervalued?
Fair value clearly above market price — typically by 25–50% — with sound fundamentals behind it (stable or improving margins, sustainable debt, real growth). If the gap exists but the business is deteriorating, the market is probably right.