Accounting Ratios: 15 Financial Ratios Every Investor Should Know

Valuation Ratios

Price-to-Earnings (P/E) Ratio: The most widely used valuation metric. Calculated as stock price divided by earnings per share. A P/E of 20 means investors pay $20 for every $1 of earnings. Compare a company's P/E to its industry average and historical range. A high P/E may indicate expected growth or overvaluation. A low P/E may indicate a bargain or a company in decline. The S&P 500 historically trades at 15-20x earnings. Learn how value investors use P/E to find bargains →

Price-to-Book (P/B) Ratio: Stock price divided by book value per share. Book value is total assets minus intangible assets and liabilities. A P/B below 1.0 suggests the market values the company at less than its liquidation value — common for banks and financial firms. P/B is most useful for asset-heavy industries (banking, insurance, real estate) and less useful for technology or service companies where intangible assets dominate. A P/B of 0.5 with solid assets signals a potential value opportunity.

EV/EBITDA: Enterprise value divided by earnings before interest, taxes, depreciation, and amortization. This is preferred over P/E for companies with significant debt because EV includes both equity and debt. A lower EV/EBITDA suggests the company is undervalued relative to its operating earnings. EV/EBITDA of 10-15 is typical for most industries. Below 8 is usually cheap; above 20 is often expensive unless growth justifies it.

Profitability Ratios

Gross Margin: Gross profit divided by revenue, expressed as a percentage. Gross margin tells you how much profit the company makes on each dollar of revenue after direct production costs. A 60% gross margin means $0.60 of every revenue dollar is gross profit. Software companies often have 70-80% gross margins. Retailers operate on 20-40%. Declining gross margins suggest pricing pressure or rising input costs. Rising gross margins suggest pricing power or operational efficiency gains.

Operating Margin: Operating income divided by revenue. Operating margin measures profitability after all operating expenses (SG&A, R&D, depreciation). It tells you how efficiently the company runs its core business. A company with 20% operating margin keeps $0.20 of each revenue dollar as operating profit. Compare operating margin across peers — the company with the highest operating margin typically has a competitive advantage (brand, scale, technology, or network effects).

Net Profit Margin: Net income divided by revenue. Net profit margin is the bottom line — how much profit remains after all expenses including taxes and interest. A 10% net profit margin means the company earns $0.10 for every dollar of revenue. Net profit margin varies dramatically by industry — software companies often have 20-30% margins while grocery stores operate on 1-3%. Compare net margin within the same industry only.

Return on Equity (ROE): Net income divided by shareholders' equity. ROE measures how effectively management generates profit from shareholder capital. An ROE of 15% means the company generates $0.15 of profit for every $1 of equity. Consistently high ROE (15-20%+) indicates a durable competitive advantage. ROE can be artificially inflated by high debt — always check leverage alongside ROE.

Return on Assets (ROA): Net income divided by total assets. ROA measures how efficiently a company uses its assets to generate profit. ROA of 5% means $0.05 of profit per dollar of assets. ROA is especially useful for comparing companies within capital-intensive industries (manufacturing, utilities, telecom). A rising ROA suggests improving operational efficiency. A declining ROA may signal asset bloat or competitive pressure.

Liquidity and Solvency Ratios

Current Ratio: Current assets divided by current liabilities. The current ratio measures whether a company can pay its short-term obligations (due within 12 months) with its short-term assets. A ratio above 1.0 means current assets exceed current liabilities. Above 2.0 is generally considered healthy for most industries. Below 1.0 suggests potential liquidity problems. However, too high a current ratio (above 3.0) may indicate inefficient use of assets — the company is holding too much cash or inventory.

Quick Ratio (Acid-Test): (Current assets minus inventory) divided by current liabilities. The quick ratio is a stricter measure of liquidity because it excludes inventory (which may take time to sell). A quick ratio above 1.0 means the company can meet all short-term obligations without selling any inventory. This is particularly important during economic downturns when inventory may not sell quickly. Companies with quick ratios below 0.5 are at elevated risk of default in a credit crunch.

Debt-to-Equity (D/E) Ratio: Total liabilities divided by shareholders' equity. D/E measures how much debt the company uses to finance its operations relative to equity. A D/E of 1.0 means equal debt and equity financing. D/E above 2.0 indicates aggressive leverage that could be dangerous during economic downturns or rising interest rates. Utility and telecom companies typically have higher D/E (4-6x) because they have stable cash flows to service debt. Technology companies typically have lower D/E (0.2-0.5x). Understand how debt levels affect bond risk →

Per-Share and Cash Flow Ratios

Earnings Per Share (EPS): Net income divided by number of outstanding shares. EPS is the most direct measure of a company's profitability per share of stock. Diluted EPS accounts for stock options, warrants, and convertible securities that could increase the share count. EPS growth is the primary driver of stock prices over the long term. A company growing EPS at 15% per year should see its stock price rise roughly 15% per year, assuming the P/E multiple stays constant.

Free Cash Flow Yield: Free cash flow per share divided by stock price. Free cash flow (FCF) is operating cash flow minus capital expenditures — the cash available for dividends, buybacks, and reinvestment. FCF yield is like the P/E ratio but uses cash flow instead of earnings (which can be manipulated). A 5% FCF yield means you get $0.05 of free cash flow for every dollar invested. FCF yield above 8% is generally attractive. Below 2% suggests the stock is expensive.

Dividend Yield: Annual dividends per share divided by stock price. Dividend yield measures the cash return on your investment. A 3% dividend yield on a $100 stock means you receive $3 per year in dividends. But dividend yield alone is misleading — a high yield could indicate a falling stock price (yield trap) rather than a generous dividend policy. Always check the payout ratio to assess dividend sustainability.

Payout Ratio: Dividends per share divided by EPS. The payout ratio tells you what percentage of earnings is paid out as dividends. A 40% payout ratio means the company pays 40% of earnings as dividends and retains 60% for reinvestment. Payout ratios above 80% are risky because a small earnings drop could force a dividend cut. Payout ratios below 30% suggest room for dividend growth. Mature companies have higher payout ratios (50-70%). Growth companies have lower payout ratios (0-20%).

What is a good P/E ratio?

There is no single "good" P/E ratio — it depends on the industry, growth rate, and interest rate environment. The S&P 500 historically trades at 15-20x earnings. Growth stocks often trade at 30-50x+ because investors expect future earnings growth. Value stocks often trade at 8-15x. A good approach is to compare a company's P/E to its 5-year average P/E and to its industry peers. A P/E below the historical average could signal a buying opportunity. A P/E well above peers without superior growth could signal overvaluation.

Which ratio is best for evaluating debt risk?

Debt-to-equity (D/E) is the most common leverage ratio, but it has limitations. Interest coverage ratio (EBIT divided by interest expense) is better for assessing whether a company can service its debt. An interest coverage ratio below 2.0 is dangerous — the company may struggle to pay interest during a downturn. For credit analysis, also look at net debt-to-EBITDA. A ratio above 4x is considered high leverage and increases the risk of default. Always check both the level and the trend of debt ratios over time.

Can accounting ratios be manipulated?

Yes. Companies can manipulate earnings through aggressive revenue recognition, one-time charges, pension assumptions, and stock buybacks that boost EPS. Debt can be hidden through off-balance-sheet entities (Enron) or operating leases. Cash flow ratios (FCF yield) are harder to manipulate than earnings-based ratios (P/E). Always read the footnotes and check for non-recurring items. Compare reported ratios to cash flow ratios — if they tell different stories, dig deeper. A company with great P/E but terrible FCF yield is usually a red flag.

How many ratios should I track for each stock?

Start with 5-7 core ratios: P/E, ROE, debt-to-equity, current ratio, gross margin, FCF yield, and EPS growth rate. Add more as needed based on the industry. For banks, focus on P/B and net interest margin. For retailers, focus on inventory turnover and same-store sales growth. For tech companies, focus on gross margin and revenue growth. The key is not tracking every ratio — it is understanding which ratios matter for that specific business model.

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