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There is no single ratio that fairly ranks every stock. Start by understanding how each company makes money, then choose a valuation measure that fits that business and compare its growth, risk, profitability, leverage, and accounting on a consistent basis. Sector averages can provide context, but they are not a shortcut to deciding which stock is cheaper.
Why a cross-industry comparison needs more than a share price
A $20 share is not necessarily cheaper than a $200 share. Share price reflects both the value of the company’s equity and the number of shares outstanding; it says little about what investors pay for the company’s earnings, sales, book value, or cash flow.
Valuation multiples make companies easier to compare by relating a value to a financial measure. But the numerator and denominator must match. Price-to-earnings (P/E) compares equity value with earnings attributable to shareholders. Enterprise-value (EV) multiples compare the value of operating assets with operating measures such as EBITDA or sales. Treating those different measures as interchangeable can distort a comparison.
Multiples also reflect expectations and business economics, not just industry labels. Growth, risk, payout, profitability, capital structure, and maturity can all help explain why two companies trade at different valuations. A relative valuation is an estimate against market prices for comparable businesses, not proof of intrinsic value or a guarantee of future returns.
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Build a fair comparison before choosing a ratio
- Describe how each company earns and reinvests money. Identify its main products or services, customers, revenue sources, and major costs. Note whether the business depends on physical assets, financial assets, recurring contracts, or internally developed intangible assets.
- Choose an appropriate peer set. For a judgment-led comparison, look for companies similar in business model, size, and markets served—not simply companies assigned to the same broad sector. A wider sample can help in statistical analysis, but differences in fundamentals still need to be controlled for.
- Put the figures on a common basis. Match reporting periods and definitions. Distinguish trailing results from forecasts, check for unusual items, and note whether earnings reflect a cyclical peak or trough. Use normalized earnings when a single period is not representative.
- Select a valuation measure that fits the business and available data. Check that the numerator and denominator correspond, and that the denominator is meaningful for both companies.
- Explain the remaining differences. Compare growth, risk, margins, returns, leverage, and reinvestment needs before drawing a conclusion. If material differences remain, describe them rather than compressing them into a single score.
Choose a valuation measure that fits the business
| Measure | When it can help | What to check |
|---|---|---|
| P/E | Comparing companies with positive, reasonably representative earnings. | Specify whether earnings are trailing, current, or forward. Loss-making firms do not have a meaningful positive P/E, and a large share of losses can make an industry aggregate hard to interpret. |
| EV/EBITDA or EV/EBIT | Comparing operating businesses when capital structures differ; enterprise value is paired with an operating earnings measure. | EBITDA excludes capital spending and can obscure differences in depreciation and asset intensity. Check that operating definitions are consistent. |
| Price-to-book (P/B) | Often more informative for financial services, where book values may be closer to market values than they are for businesses reliant on internally generated intangible assets. | Interpret it alongside return on equity (ROE) and risk, not in isolation. |
| Price-to-sales or EV-to-sales | Useful when earnings are negative or distorted by accounting choices. Sales multiples are less directly affected by accounting than earnings or book-value multiples. | Sales alone do not establish value: compare margins and the path to sustainable profitability. Price-to-sales measures equity value; EV-to-sales measures operating-business value. |
| Cash-flow measures | Can be useful when reported earnings are less informative for a particular business. For REITs, Damodaran’s sector guidance points to price-to-cash-flow because large depreciation charges can make equity earnings less informative. | Check how cash flow is defined and whether it reflects recurring operations and the business’s reinvestment needs. |
These are starting points, not prescriptions. Sector conventions can be useful, but a familiar ratio can mislead if it no longer reflects a company’s fundamentals or the sector is changing. Damodaran’s guidance, for example, discusses normalized earnings for cyclical manufacturing, price-to-book for financial services, and price-to-cash-flow for REITs; the right measure still depends on the company and the comparison being made. Damodaran’s valuation-multiple guidance includes further sector examples.
Adjust for the differences that move multiples
Growth and the evidence behind it
Compare expected growth over the same horizon, and keep forecasts distinct from realized history. A company expected to grow faster may reasonably trade at a higher multiple, but growth forecasts are uncertain and do not make a high valuation automatically justified.
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PEG, which relates P/E to expected growth, is sometimes used when companies grow at different rates. It assumes other relevant characteristics are comparable and that the multiple responds proportionally to growth—assumptions that can fail. Aswath Damodaran notes, “Big differences in growth across firms make it difficult to compare PE ratios.”
Risk, cash generation, and payout
Consider both business risk and financial risk, as well as the stability of cash flows and the company’s payout. Companies in the same industry can face different customer concentration, cyclicality, debt burdens, or reinvestment needs. A similar label does not mean their expected cash flows carry similar risk.
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Pair sales multiples with margins: a business can appear inexpensive on sales while earning little from each dollar of revenue. For P/B, ROE helps show how effectively a company generates earnings from its book equity. Differences in profitability can justify differences in valuation.
Leverage and consistent numerators
Use equity-value measures with equity measures, such as P/E or P/B, and enterprise-value measures with operating measures, such as EV/EBITDA or EV/sales. When leverage differs, enterprise-value measures can make operating comparisons more informative, provided the operating figures are defined consistently. They do not eliminate the need to assess debt or other business risks.
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Accounting, reporting periods, and the business cycle
Check the period covered, accounting definitions, unusual items, and depreciation. Reported earnings may not be comparable if one company has a one-off gain or if asset intensity leads to very different depreciation. For cyclical businesses, a peak-year or trough-year result can give a misleading signal; use earnings normalized across the cycle when a single period is unrepresentative.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use sector averages as context, not a verdict
Sector multiples depend on which firms are included, how the multiple is calculated, and the market and earnings data available at a given time. An average may also be difficult to interpret when many firms have negative earnings. Damodaran’s U.S. sector P/E dataset, analyzed as of January 2026, illustrates the issue: trailing losses affected 78.85% of Advertising firms (52 firms in the sample) and 6.67% of Money Center Bank firms (15 firms). These are dated sample figures, not enduring properties of either sector.
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The dataset’s January 2026 Total Market row covered 5,994 firms: 57.16% reported trailing losses, while the reported trailing P/E was 57.86. The same row reports a market-capitalization-to-trailing-net-income figure of 26.56 for firms with positive earnings. The differing figures reflect different inclusion rules and denominators; an aggregate multiple needs its calculation method alongside it. None of these January 2026 figures should be treated as current in a later market environment or as an investment recommendation.
Damodaran’s industry-data index catalogs valuation, margins, leverage, and growth data across multiple geographies. Before using a sector figure, check its date, geography, sample, and definition. A sector average is a reference point; it cannot tell you whether two particular companies have comparable economics.
Turn the comparison into a reasoned judgment
For each candidate, record the business model and peer fit, growth expectations and their basis, business and financial risks, margins and returns, leverage and reinvestment requirements, and any accounting or cycle adjustments. Then identify the valuation multiple used, its numerator and denominator, the period covered, and the data date and geography.
The result should be a conditional conclusion: one stock may look cheaper on a particular measure, but the apparent discount may reflect lower margins, slower expected growth, higher risk, or a different capital structure. If the companies differ substantially, state what the chosen multiple can and cannot establish instead of declaring one universally cheaper.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesThis is general educational information, not personalized investment advice. No cross-industry ratio can establish that a particular stock is undervalued without further analysis.
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