Stock Valuation Ratios: P/E, P/B, ROE and EV/EBITDA Explained
A low P/E, high dividend yield or price below book value does not prove that a stock is undervalued. A multiple compresses a relationship between price and one business measure. It becomes misleading when the dates, accounting, share count, industry, growth and risk are inconsistent. This guide calculates the major ratios for one fictional company, shows the question each ratio can address and identifies the point at which the shortcut breaks.
Who this guide is for: Readers who want to understand valuation screens from their formulas and reconcile the result to primary financial statements
Key points to understand first
- P/E divides price by EPS and can fail around losses, unusual earnings, cycles and changing share counts.
- P/B and ROE belong together because book valuation needs context about the profitability and quality of equity.
- EV/EBITDA helps compare operating value across capital structures but omits investment, working capital, tax and the quality of debt.
- Align actual or forecast periods, basic or diluted shares, average or period-end balances, accounting basis, currency and EV adjustments.
Choose a ratio for the question, not as the answer
| Ratio | Numerator / denominator | Useful question | Main weakness |
|---|---|---|---|
| P/E | Price / EPS | Price per unit of earnings | Losses, cycles, unusual profit |
| P/B | Price / BPS | Price relative to book equity | Asset quality and measurement |
| ROE | Profit / average equity | Return on shareholder capital | Leverage and repurchases |
| EV/EBITDA | Enterprise value / EBITDA | Operating value across financing | Omits capex, tax and working capital |
| Dividend yield | Dividend / price | Distribution at current price | Cuts and falling-price traps |
Valuation measures price relative to a business quantity
Equity valuation asks what the current price represents relative to earnings, book capital, sales, cash flow or another business measure. Ratios compress comparisons; they do not calculate one certain fair price. A low multiple can be consistent with weak expected growth, poor earnings quality, debt, regulation or an asset impairment. A high multiple does not guarantee growth and can increase sensitivity when expectations disappoint.
Compare in three directions: economically similar peers, the company’s own history, and the growth and required return implicit in the price. A peer can have different segments, standards, geography or financing. A historical average can lose relevance after the business or rate environment changes. Keep the assumptions that explain the multiple and the evidence that would invalidate them.
P/E is the share price paid for one unit of EPS
P/E divides price per share by earnings per share. Market capitalization divided by common earnings expresses the same idea when share definitions align. A trailing ratio uses a completed period; a forward ratio uses forecasts. Do not mix the forecast horizon, collection date, company guidance and analyst consensus. Annualizing one quarter can distort businesses with seasonality or unusual items.
P/E becomes uninformative with a loss and unstable with very small positive earnings. Asset sales, tax effects, impairment and restructuring can change the denominator temporarily. A cyclical company can look cheapest at peak earnings and most expensive at the trough. Review operating results and normalized multi-period evidence; if adjusting earnings, apply a documented rule rather than excluding every unfavorable item.
P/E = price per share ÷ EPSP/E = equity market capitalization ÷ earnings attributable to common holdersEarnings yield = EPS ÷ price = 1 ÷ P/E when earnings are positiveState trailing or forward and basic or diluted.P/B needs ROE and an assessment of asset quality
P/B divides price by book value per share; ROE divides common earnings by average common equity. A price below book does not prove that assets can be realized at recorded amounts, that returns will recover or that capital will be distributed. Goodwill, property, financial assets, internally generated brands and research have different relationships between accounting value and economics.
In a simplified identity, P/B relates to P/E multiplied by ROE, so low P/B can be consistent with low returns or high risk. High ROE is also not automatically good: borrowing or repurchases can shrink equity and lift the ratio without better operations. Combine ROE with margins, asset turnover, leverage and returns on invested capital.
| Company | Margin | Asset turnover | Leverage | Question |
|---|---|---|---|---|
| Fictional A | High | Normal | Low | Operating profitability |
| Fictional B | Low | High | Normal | Efficient turnover |
| Fictional C | Normal | Low | High | Debt dependence |
Conceptual DuPont example; no real issuer is represented.
EV/EBITDA separates operating value from financing—partly
Enterprise value starts with equity market capitalization, adds debt-like and other senior claims, and subtracts cash-like or non-operating assets. EBITDA approximates earnings before financing, tax and depreciation choices, supporting comparison across capital structures. But preferred stock, non-controlling interests, pensions, leases and investments change EV, while company-adjusted EBITDA definitions differ.
EBITDA is not cash. Maintenance investment, software development, working capital, tax and interest affect value. A capital-intensive firm may show a low EV/EBITDA yet produce little discretionary cash after replacement investment. For banks and insurers, debt is closely connected to operations, so EV multiples can be unsuitable; book value, capital and return frameworks may be more informative.
EV = equity market cap + debt-like claims − cash-like assetsEV/EBITDA = enterprise value ÷ EBITDAEquity value = enterprise value − net senior claims, using consistent adjustmentsUse identical lease, pension, minority-interest, cash and debt definitions across comparisons.Calculate several ratios for one fictional company
Assume fictional Company Q has a price of 1,200, 100 million shares, common earnings of 6 billion, equity of 48 billion, dividend of 30 per share, debt of 30 billion, cash of 10 billion and EBITDA of 10 billion. Market cap is 120 billion, EPS 60 and BPS 480. The simplified outputs are P/E 20, P/B 2.5, ROE 12.5%, dividend yield 2.5%, EV 140 billion and EV/EBITDA 14.
| Ratio | Calculation | Result | Next test |
|---|---|---|---|
| P/E | 1,200 ÷ 60 | 20× | Earnings persistence and dilution |
| P/B | 1,200 ÷ 480 | 2.5× | Asset quality and ROE |
| ROE | 6 ÷ 48 | 12.5% | Average equity and leverage |
| Dividend yield | 30 ÷ 1,200 | 2.5% | Payout and cash coverage |
| EV/EBITDA | 140 ÷ 10 | 14× | Capex and working capital |
All values are fictional and simplify tax, treasury shares, dilution and average balances.
No row is an investment conclusion. A 30% earnings decline changes the denominator; new issuance changes per-share data. Test payout funding, debt maturity and competitive margins in the financial-statement guide and earnings guide.
Align definitions and dates before ranking multiples
Record price timestamp, currency, trailing or forecast period, earnings definition, basic or diluted shares, period-end or average equity, debt and cash adjustments, accounting basis and fiscal year. Currency conversion needs consistent numerator and denominator dates. After corporate actions, update issuance, repurchases, acquisitions and disposals, not only split-adjusted price.
- Collect primary data
Return to current issuer statements and notes.
- Lock definitions
Specify TTM or forward, dilution and every EV adjustment.
- Recalculate
Explain differences from vendor output.
- Compare carefully
Adjust for segments, standards and environmental change.
- Reverse the assumption
Write the growth and return needed to justify the multiple.
Financial templates can preserve definitions, sources and disconfirming evidence. Macro Research Workbench can keep published rate and real-yield context separate. Neither returns a fair value or recommendation. Precision in decimals cannot rescue inconsistent inputs.
Frequently asked questions
Is a low P/E stock undervalued?
Not by itself. Peak-cycle or unusual profit, structural decline, debt and regulatory risk can produce a low multiple. Test earnings quality and the future assumptions.
Does P/B below one mean the stock trades below liquidation value?
No. Recorded assets may not be realizable at book value, and liquidation has liabilities and costs. Review asset quality, impairment and shareholder rights.
Is EBITDA the same as cash flow?
No. EBITDA omits capital expenditure, working capital, tax and interest. It should not replace cash-flow analysis.
Can trailing and forward P/E be compared directly?
They use different periods and inputs. Align forecast horizon, source, collection date, dilution and accounting adjustments.
Primary sources and verification links
- Investor.gov | Price-earnings RatioOfficial P/E definition
- Investor.gov | Market CapitalizationOfficial market-cap definition
- SEC | Beginners Guide to Financial StatementsEPS, P/E, margins and statement inputs
- IFRS Foundation | IAS 33 Earnings per ShareBasic and diluted EPS requirements
Edited and published by: SG Group · Editorial approach: We prioritize primary materials from issuers, exchanges, regulators and accounting standard setters. Disclosure rules, trading terms and shareholder rights can change, so verify current information at the linked source and with your provider before acting.
Important notice: This article provides general education about listed shares and equity markets. It is not investment advice, a security recommendation, a buy or sell signal, or a promise of price or return. Companies, prices, quantities and ratios are fictional learning examples unless an official market rule is expressly identified. Disclosure rules, taxes, fees, trading hours, settlement, shareholder rights and product terms vary by jurisdiction, venue, broker and date. Verify current information with the issuer, exchange, regulator and your broker before acting.