Fundamental Analysis

Financial Ratios Guide

Learn the key financial ratios used to evaluate public companies — from valuation multiples to profitability metrics, leverage indicators, and liquidity measures.

📊 15+ ratios explained📈 Applied to equity research📅 Research guide

Company Data Financial Ratios Guide Fundamental vs Technical Other Data & Research

Financial ratios distill the data in a company's income statement, balance sheet, and cash flow statement into comparable numbers. Rather than reading through pages of financial disclosures, ratios let analysts quickly assess a company's valuation, profitability, financial health, and operational efficiency — and compare those characteristics against peers and historical performance.

This guide covers the four major ratio categories and explains how to interpret each within the context of equity research.

Valuation Ratios

Price-to-Earnings (P/E)

The Price-to-Earnings ratio — or P/E — is the most widely used valuation multiple in equity analysis. It measures how much investors are paying for each dollar of a company's current earnings: P/E = Market Price per Share ÷ Earnings per Share (EPS). A P/E of 20 means the market is pricing the stock at 20 times its annual earnings.

A high P/E suggests that investors expect strong future growth and are willing to pay a premium today for earnings they anticipate tomorrow. A low P/E may indicate that a company is undervalued, that growth expectations are modest, or that the market is pricing in some degree of risk. Context matters enormously: a software company at 35× earnings may be fairly valued if it is growing revenue at 25% annually, while a mature utility at 35× would raise serious concerns.

The P/E ratio can be calculated on a trailing basis (TTM — trailing twelve months) or a forward basis (using analyst consensus estimates for the next twelve months). Forward P/E is generally more useful for investment decisions, since markets are forwardlooking. One important limitation: earnings can be manipulated through accounting choices, so P/E is best used alongside cash flow metrics such as Price-to-Free-Cash-Flow.

Price-to-Book (P/B)

The Price-to-Book ratio compares a company's market capitalization to its book value of equity — the net assets recorded on the balance sheet after subtracting liabilities: P/B = Market Price per Share ÷ Book Value per Share. A P/B above 1 means the market values the company at more than its recorded net assets, typically because investors expect future earnings to compound on that asset base.

P/B is especially meaningful for financial companies such as banks and insurance companies, where book value closely approximates the fair value of assets. For asset-light technology businesses, book value often bears little relationship to economic value — making P/B less useful in isolation. A P/B below 1 can signal deep value but can also indicate a business whose assets are deteriorating or whose earning power is impaired. Warren Buffett historically favored buying businesses at or below book value, though modern compounders with strong intangible assets often justify significant premiums.

EV/EBITDA

Enterprise Value to EBITDA is a capital-structure-neutral valuation multiple that compares the total value of a business (debt + equity, net of cash) to its earnings before interest, taxes, depreciation, and amortization. Because EV/EBITDA is unaffected by how a company chooses to finance itself, it is widely used in mergers and acquisitions and for comparing companies across different capital structures.

A company with $1B of EBITDA and $10B of enterprise value trades at 10× EV/EBITDA. Median multiples vary significantly by industry: highly capital-intensive sectors like utilities or telecom often trade at 6–10×, while high-growth software companies may trade at 20–40×. One limitation is that EBITDA excludes capital expenditures entirely, so a capital-intensive business appears artificially cheap on this metric. EV/EBITDA should be cross-checked against Free Cash Flow yield for a more complete picture of earnings quality.

Profitability Ratios

Gross, Operating, and Net Margin

Margin ratios measure how much of each revenue dollar survives at different stages of the income statement. Gross Margin is Revenue minus Cost of Goods Sold, divided by Revenue — it shows the efficiency of the core product or service before overhead. Operating Margin subtracts operating expenses (R&D, SG&A, depreciation) from gross profit and measures how profitable the business is before financing costs and taxes. Net Margin is the bottom line: net income divided by revenue, capturing everything including interest and tax.

Margin comparison across time and against competitors is one of the most informative exercises in equity analysis. Expanding gross margins suggest improving pricing power or falling input costs. Compressing operating margins despite growing revenue often signal rising overhead or investment spend. A company with a 40%+ gross margin but a single-digit net margin is spending heavily somewhere — understanding why, and whether that spending is productive, is a core analytical task.

Return on Equity (ROE) and Return on Assets (ROA)

Return on Equity measures how efficiently a company generates profit from its shareholders' capital: ROE = Net Income ÷ Shareholders' Equity. A ROE of 20% means the company earns $0.20 for every $1.00 of equity on the books. High and consistent ROE over time is one of the hallmarks of a quality business. Return on Assets (ROA) is similar but uses total assets in the denominator, making it insensitive to how the business is financed.

The DuPont framework decomposes ROE into three multiplicative components: Net Margin (profitability), Asset Turnover (how efficiently assets generate revenue), and the Equity Multiplier (financial leverage). This decomposition reveals why a company has a high or low ROE. A retailer with thin margins but rapid inventory turns achieves ROE differently than a luxury goods company with wide margins and slow turns. Two businesses with identical ROE may have very different risk profiles depending on how much leverage is in the denominator.

Leverage Ratios

Debt-to-Equity and Net Debt/EBITDA

The Debt-to-Equity ratio measures the proportion of a company's financing that comes from creditors relative to shareholders: D/E = Total Debt ÷ Total Equity. A D/E of 1.0 means the company has equal amounts of debt and equity. Higher leverage amplifies returns in good times and amplifies losses in bad times. Net Debt/EBITDA takes this a step further by measuring how many years of operating earnings would be required to pay off the net debt — a common threshold for investment-grade companies is below 3×.

Acceptable leverage varies dramatically by industry. Utilities and real estate companies routinely carry 3–5× Net Debt/EBITDA because their cash flows are predictable and asset-backed. Consumer technology companies often carry negative net debt (net cash). High leverage is not inherently bad, but it introduces the risk of financial distress if earnings fall unexpectedly. The interest coverage ratio — EBIT divided by interest expense — complements D/E by showing how comfortably earnings cover debt service. A coverage ratio below 2× is generally a warning sign.

Liquidity Ratios

Current Ratio and Quick Ratio

Liquidity ratios measure a company's ability to meet its short-term obligations. The Current Ratio compares current assets (cash, receivables, inventory) to current liabilities (payables, short-term debt): Current Ratio = Current Assets ÷ Current Liabilities. A ratio above 1.0 indicates the company has more short-term assets than short-term liabilities. The Quick Ratio — also called the acid-test — excludes inventory from current assets, making it a more conservative measure of immediate liquidity for businesses where inventory cannot be converted to cash quickly.

A current ratio of 1.5–2.0 is generally considered healthy, though industry norms vary. Retailers often operate with ratios near 1.0 because they convert inventory to cash rapidly. Technology companies with large deferred revenue balances may show artificially low ratios. A declining trend in the current ratio over several quarters — even if it remains above 1.0 — can be an early warning of cash management challenges. Liquidity ratios are most useful as signals to investigate further, not as standalone verdicts on financial health.

How to Use These Together

No single ratio tells a complete story. The most productive approach is to read ratios in combination — and always relative to the company's history and its closest peers. A company with a high P/E, expanding margins, strong ROE, and conservative leverage is making a different kind of investment claim than one with a low P/E, flat margins, declining ROE, and rising debt. Both might be interesting investment opportunities, but for entirely different reasons.

At Systems Capital, we generally begin with valuation multiples to establish price context, then move to profitability ratios to assess the quality of the business model, then to leverage and liquidity ratios to evaluate balance sheet risk. Only after understanding all three layers do we form a view on whether current pricing represents an attractive entry point. Ratios are the beginning of the conversation, not the conclusion.