Stock Valuation Ratios Explained
Stock valuation ratios compare a company’s market price with its earnings, revenue, assets or cash flow. They help answer a practical question: how much are investors paying for the business behind each share? As FINRA’s guide to evaluating stocks explains, ratios make comparisons more useful when companies differ in size and share count.
The calculation is usually straightforward. Interpreting it takes more care. A low multiple can suggest an attractive price, but it can also reflect a business in trouble. Use valuation ratios within your broader fundamental analysis of stocks, rather than treating the smallest number on a screen as a buying instruction.
Stock Valuation Ratio Formulas
Most valuation ratios express price as a multiple of a financial measure. A ratio of 15 times, written as 15x, means investors are paying $15 for each $1 of that measure. Dividend yield works the other way around: it expresses annual dividends as a percentage of the share price.
Keep the scale consistent. Divide a share price by a per-share figure, or a whole-company value by a whole-company figure. CFA Institute distinguishes equity price multiples from enterprise value multiples, which account for capital supplied beyond common shareholders.
| Ratio | Formula | What it compares |
|---|---|---|
| Price to earnings (P/E) | Share price ÷ earnings per share | Price against accounting profit |
| Price/earnings to growth (PEG) | P/E ÷ expected annual EPS growth rate, entered as a percentage number | Earnings valuation against expected growth |
| Price to sales (P/S) | Market capitalization ÷ revenue | Equity value against sales |
| Price to book (P/B) | Share price ÷ common book value per share | Price against recorded common shareholder equity |
| EV/EBITDA | Enterprise value ÷ EBITDA | Business value against earnings before interest, taxes, depreciation and amortization |
| Price to free cash flow (P/FCF) | Market capitalization ÷ free cash flow | Equity value against cash generation after capital expenditure |
| Dividend yield | Annual dividends per share ÷ share price × 100 | Annual dividend income relative to price |
All numerical examples below are hypothetical, not current company valuations or investment recommendations.
How to Interpret the Main Valuation Ratios
Price to Earnings: What Are You Paying for Profit?
A stock priced at $60 with annual earnings per share, or EPS, of $3 has a P/E of 20. Investors are paying $20 for each $1 of annual earnings. That does not mean shareholders receive those earnings as cash payments.
The earnings period matters. Trailing P/E uses the previous 12 months of earnings, often labeled TTM. Forward P/E uses forecast earnings, commonly for the next 12 months or next fiscal year. Check which period the data provider uses. Schwab’s explanation of trailing and forward P/E covers this distinction and the weaknesses of each measure.
If the same $60 stock is expected to earn $4 per share, its forward P/E is 15. It looks cheaper on expected earnings, but only if those earnings arrive.
Negative earnings do not produce a useful conventional P/E comparison. A negative multiple is not an unusually good bargain. Cyclical businesses present another problem: unusually strong earnings can temporarily push P/E down. Review profits across a business cycle rather than assuming a record year will repeat.
PEG: Does Expected Growth Support the P/E?
PEG divides the P/E ratio by expected annual EPS growth. Enter growth as a percentage number: use 12 for 12%, not 0.12. A P/E of 24 and expected growth of 12% produce a PEG of 2.
Fidelity’s overview of company valuation ratios describes PEG as a way to connect earnings valuation with growth expectations. It also stresses comparison with the company’s industry.
A PEG below 1 is sometimes treated as a value signal, but it is not a dependable boundary between cheap and expensive. Forecast quality matters more than the neatness of the result. If expected growth drops from 12% to 6%, the example’s PEG doubles from 2 to 4 without any change in price.
Check the forecast horizon and the P/E basis. Comparing a PEG built on three years of expected growth with one using a different period creates false precision. Zero or negative growth also makes the usual PEG interpretation unsuitable.
Price to Sales: Revenue Is Not Profit
P/S compares market capitalization with revenue. Market capitalization is the share price multiplied by outstanding shares. Because P/S does not require positive earnings, it can help assess companies that are not yet profitable. It cannot tell you whether those sales will ever produce adequate profits.
Profit margins change the interpretation dramatically. Consider two businesses trading at 2x sales. If one earns a 5% net margin, its implied P/E is 40. If the other earns a 20% margin, its implied P/E is 10, using matching periods and earnings attributable to common shareholders.
The same sales multiple therefore buys very different earning power. Aswath Damodaran’s analysis of price-to-sales ratios explains why margins are central to revenue valuation.
For a company losing money, ask what margin it could reasonably achieve and how much additional funding it might need before reaching profitability. A low P/S does not answer either question.
Price to Book: What Are the Recorded Net Assets Worth?
P/B compares the share price with book equity per common share. A $30 stock with common book value of $40 per share trades at 0.75x book value.
That discount does not guarantee shareholders could collect $40 if the business closed. Accounting values and realizable asset values can differ. Equipment may sell for less than its recorded value, while property purchased decades ago may be worth more.
Schwab’s discussion of book value explains these accounting limitations and why P/B is less informative for businesses whose value depends heavily on intangible assets.
Use common shareholder equity, not total assets. For companies with substantial physical assets, examine their condition and earning power. For a software business, much of the value may come from internally developed technology and customer relationships that the balance sheet does not fully capture. A higher P/B is not automatically evidence of overpricing.
EV/EBITDA: Include Debt in the Comparison
Enterprise value, or EV, extends the calculation beyond common equity. A common starting formula is:
EV ≈ market capitalization + debt + preferred equity + noncontrolling interests − cash and cash equivalents.
Some businesses need further adjustments. Damodaran’s definitions of enterprise value and related ratios explain why cash is deducted and noncontrolling interests are added when using consolidated financial results.
Suppose a company has a $5 billion market capitalization, $2 billion of debt and $500 million in cash, with no preferred equity or noncontrolling interests. Its EV is $6.5 billion. With EBITDA of $650 million, it trades at 10x EV/EBITDA.
EBITDA means earnings before interest, taxes, depreciation and amortization. Pairing it with enterprise value helps compare businesses with different debt levels because EBITDA is measured before interest expense. It does not make debt risk disappear.
Nor is EBITDA cash available to shareholders. It does not deduct capital expenditure or account for changes in working capital. A business can report healthy EBITDA while spending heavily to maintain its operations.
Be cautious with “adjusted EBITDA.” Read the reconciliation rather than assuming every excluded expense is harmless. The SEC’s guidance on non-GAAP measures warns that excluding normal, recurring cash operating expenses can produce misleading performance measures.
Price to Free Cash Flow: Check What Remains After Investment
For this comparison, free cash flow means operating cash flow minus capital expenditure. This differs from price to operating cash flow, which does not deduct capital spending. Schwab’s guide to free cash flow explains the calculation and its relationship to accounting earnings.
A business worth $2 billion in the stock market that produces $100 million in annual free cash flow trades at 20x P/FCF. The reciprocal is its free cash flow yield:
Free cash flow yield = free cash flow ÷ market capitalization × 100.
In this example, the yield is 5%. That is a valuation measure, not a promised distribution or investment return.
Inspect several years of cash generation rather than one unusually strong period. Ask whether capital spending was postponed and whether movements in receivables, inventory or supplier payments temporarily helped cash flow.
Definitions also matter. The SEC notes that free cash flow has no uniform definition and may leave mandatory debt payments undeducted. “Free” is an accounting label here, not permission to spend every dollar.
Dividend Yield: Income Relative to Price
A stock paying $2 annually in dividends at a $50 share price yields 4%. If its price falls to $25 while the dividend stays unchanged, the displayed yield rises to 8%.
That increase says nothing by itself about the dividend’s safety. Fidelity’s dividend yield guide explains that a high yield can reflect a falling share price and the risk of a dividend cut.
Check whether the quoted yield uses past payments or an annualized current dividend. Assess dividend coverage alongside earnings, cash flow and debt commitments rather than ranking stocks by yield alone.
Turn Ratios Into a Valuation Range
A multiple becomes more useful when you test the assumptions behind it. Consider a hypothetical company expected to earn $5 per share next year. Suppose your peer comparison supports examining a forward P/E range of 14 to 18.
Multiplying $5 by those multiples produces an implied price range of $70 to $90. These are scenario outputs, not guaranteed targets.
Now stress the assumptions. If EPS reaches only $4 and investors assign a P/E of 12, the implied price becomes $48. Both earnings and the valuation multiple can disappoint at the same time.
The practical question is not simply whether the current price sits below $90. Ask what evidence supports $5 of earnings, why the company deserves those multiples, and whether the weaker outcome would be acceptable. Do not select a generous multiple just because it produces the answer you wanted.
Use Valuation Ratios Consistently
A repeatable comparison is more useful than a large collection of ratios. Before acting on an apparent discount:
- Choose relevant peers. Compare similar business models, growth prospects and profitability. Schwab’s approach to assessing undervalued stocks emphasizes comparisons within the same subindustry and reviewing several measures together.
- Standardize the inputs. Record the price date, reporting period, forecast horizon and earnings definition. Do not mix trailing earnings with forward peer multiples, or reported earnings with adjusted figures without explaining the difference.
- Inspect the underlying accounts. Trace unusual profits, cash movements and adjustments back to the reports. The SEC’s financial statement guide highlights the value of footnotes and management’s discussion. Our guide to reading company financial statements covers that process.
- Recalculate when the evidence changes. Update the comparison after results, revised guidance or changes in financing. Our explanation of how earnings reports affect stock prices provides the broader context.
Choose ratios that fit the business, too. Banks require different treatment from manufacturers because borrowing is part of their operating model. Damodaran’s discussion of financial companies explains why conventional enterprise value and cash flow calculations can be problematic for them.
Finally, keep valuation separate from trade timing. Schwab’s analysis of market valuation and subsequent returns illustrates why an attractive multiple is not a reliable entry signal. Use ratios to test the price you are paying, then manage position size and potential losses through a separate stock trading risk plan.