Ratio Analysis
Ratio analysis transforms raw numbers from financial statements into meaningful relationships. A company with $5 million in cash sounds healthy until you learn it also has $50 million in debt due next month. By relating one number to another, ratios expose patterns that isolated figures hide. They are the analyst's first-pass diagnostic tool for assessing liquidity, debt risk, earnings performance, and operational efficiency.
Learning Objectives
- Define liquidity, solvency, profitability, and efficiency ratios and explain what each category measures.
- Apply current ratio, quick ratio, debt-to-equity, times interest earned, gross profit margin, net profit margin, return on assets, return on equity, inventory turnover, and receivables turnover formulas to financial statement data.
- Explain why ratios must be compared over time, against industry peers, and with accounting method differences in mind.
- Compare current ratio and quick ratio, identifying which gives a stricter picture of short-term liquidity and why.
- Analyze a set of ratios together to form a coherent interpretation of a company's financial condition.
- Apply the DuPont framework to decompose return on equity into its component drivers.
- Evaluate how accounting policy choices — inventory method, depreciation method — affect ratio results.
Quick Answer
Ratio analysis extracts insight from financial statements by measuring one figure against another. A single ratio rarely tells the full story: a 3.0 current ratio looks strong until you realize most of those current assets are slow-moving inventory, and the quick ratio drops to 0.5. Ratios are grouped into four categories: liquidity (can we pay short-term debts?), solvency (can we manage long-term debt?), profitability (are we generating adequate returns?), and efficiency (are we using assets well?). US analysts compare ratios across multiple periods, against S&P industry benchmarks, and after adjusting for differences in accounting policies under US GAAP or IFRS.
The Four Categories at a Glance
| Category | Core Question | Key Users |
|---|---|---|
| Liquidity | Can the company meet obligations in the next 12 months? | Creditors, banks, suppliers |
| Solvency | Is the company's debt load sustainable long-term? | Bond investors, lenders, rating agencies |
| Profitability | Is the company generating adequate returns on sales and capital? | Equity investors, management, boards |
| Efficiency | Is the company converting assets into sales and cash efficiently? | Management, operational analysts |
Liquidity Ratios
Current Ratio
Current ratio = Current assets ÷ Current liabilities
Measures whether current assets (convertible to cash within one year) are sufficient to cover current liabilities (due within one year).
Example: If current assets are $800,000 and current liabilities are $400,000, the current ratio is 2.0. This means the company has $2 of current assets for every $1 of current liabilities.
Interpretation guide:
- A ratio below 1.0 means current liabilities exceed current assets — a potential liquidity problem.
- A very high ratio (above 4 or 5) may suggest idle cash or excessive inventory.
- Industry matters: US grocery chains routinely operate below 1.0 because they collect cash before paying suppliers.
Quick Ratio (Acid-Test Ratio)
Quick ratio = (Cash + Short-term investments + Accounts receivable) ÷ Current liabilities
Inventory and prepaid expenses are excluded because they cannot be converted to cash quickly or reliably.
The quick ratio gives a more conservative view of immediate liquidity. A company with a current ratio of 3.0 but a quick ratio of 0.7 likely has most of its current assets tied up in inventory — which may or may not sell quickly.
Cash Ratio
Cash ratio = (Cash + Cash equivalents) ÷ Current liabilities
The most conservative liquidity measure. Rarely used alone, but useful for assessing ability to survive a complete freeze of credit and receivables.
Solvency Ratios
Debt-to-Equity Ratio
Debt-to-equity ratio = Total liabilities ÷ Total stockholders' equity
Shows the balance between creditor financing and owner financing. A ratio of 1.5 means $1.50 of debt for every $1 of equity.
Higher ratios indicate more financial leverage — amplifying both gains and losses. US companies in capital-intensive industries (utilities, REITs, airlines) commonly carry higher debt ratios than technology companies. Lenders embed maximum debt-to-equity thresholds in loan covenants.
Times Interest Earned (Interest Coverage Ratio)
Times interest earned = Earnings before interest and taxes (EBIT) ÷ Interest expense
Measures how many times over the company can cover its interest payments from operating earnings.
- A ratio of 1.0 means EBIT exactly covers interest — no margin of safety.
- A ratio of 3.0 is a common minimum threshold in US bond covenants.
- A ratio below 1.5 may trigger credit rating downgrades from Moody's or S&P.
Example: EBIT = $300,000; Interest expense = $60,000 → TIE = 5.0x. The company earns five times its interest obligations, indicating comfortable debt service capacity.
Debt Ratio
Debt ratio = Total liabilities ÷ Total assets
Expresses what proportion of assets is financed by creditors. A debt ratio of 0.60 means 60% of assets are funded by debt, 40% by equity.
Profitability Ratios
Gross Profit Margin
Gross profit margin = Gross profit ÷ Net sales revenue
Shows how much revenue remains after deducting the direct cost of products sold. High gross margins give a company more room to cover operating expenses and earn net profit. A declining gross margin is often the first signal of pricing pressure or rising input costs.
Example: Apple's gross margin consistently exceeds 40%, reflecting premium pricing and efficient supply chain management.
Net Profit Margin
Net profit margin = Net income ÷ Net sales revenue
The bottom-line percentage: of every dollar of sales, how many cents become profit after all expenses, interest, and taxes.
Grocery and discount retail margins are typically 1–3%; pharmaceutical and software companies often exceed 20%.
Return on Assets (ROA)
Return on assets = Net income ÷ Average total assets
Measures how efficiently the company's entire asset base generates earnings. Use average assets (beginning + ending ÷ 2) to account for asset changes during the year.
ROA is useful for comparing companies within the same industry but is less meaningful across industries with very different asset intensities.
Return on Equity (ROE)
Return on equity = Net income ÷ Average stockholders' equity
Measures the return generated for shareholders. High ROE is generally positive, but it can also result from high leverage rather than operational excellence — so always read ROE alongside the debt-to-equity ratio.
DuPont Analysis
ROE can be decomposed into three drivers:
ROE = Net profit margin × Asset turnover × Equity multiplier
Where:
Net profit margin = Net income ÷ Sales
Asset turnover = Sales ÷ Average total assets
Equity multiplier = Average total assets ÷ Average equity
DuPont shows whether ROE is driven by profitable operations (high margin), efficient asset use (high turnover), or financial leverage (high multiplier). Two companies with identical ROE may have very different risk profiles if one achieves it through leverage and the other through operating efficiency.
Efficiency Ratios
Inventory Turnover
Inventory turnover = Cost of goods sold ÷ Average inventory
How many times inventory is fully sold and replaced during the period.
- High turnover: inventory moves quickly (good for most retailers; use average to smooth seasonal fluctuations).
- Low turnover: inventory is slow-moving, potentially obsolete, or overordered.
Days inventory outstanding (DIO) converts this to days:
Days inventory outstanding = 365 ÷ Inventory turnover
A US grocery chain might show DIO of 10–15 days; a luxury jeweler might show 200+ days.
Receivables Turnover
Receivables turnover = Net credit sales ÷ Average accounts receivable
How efficiently the company collects from credit customers.
Days sales outstanding (DSO) converts to days:
Days sales outstanding = 365 ÷ Receivables turnover
US payment terms are typically net 30 or net 60. DSO above 60 days may indicate collection problems or overly generous credit terms.
Asset Turnover
Asset turnover = Net sales ÷ Average total assets
How much revenue each dollar of assets generates. Walmart's asset turnover consistently exceeds 2.0; a capital-intensive steel manufacturer may be below 0.5.
Payables Turnover and Days Payable Outstanding
Days payable outstanding = (Average accounts payable ÷ COGS) × 365
How long, on average, the company takes to pay its suppliers. Longer DPO can indicate strong bargaining power (Walmart stretching payment to 45+ days) or cash management strategy, but excessively long DPO can damage supplier relationships.
Reading Ratios Together: A Mini Case
A US specialty retailer shows:
| Ratio | This Year | Last Year | Industry Average |
|---|---|---|---|
| Current ratio | 3.2 | 2.8 | 2.0 |
| Quick ratio | 0.6 | 0.9 | 1.2 |
| Inventory turnover | 2.1x | 3.5x | 5.0x |
| Gross profit margin | 38% | 42% | 45% |
| Net profit margin | 4% | 7% | 9% |
| DSO | 28 days | 22 days | 25 days |
Reading the ratios together: The rising current ratio looks superficially positive, but the declining quick ratio and low inventory turnover reveal the cause — inventory is building up sharply. The company is not selling its goods as fast as before, leading to markdowns that are compressing gross and net margins. The relatively normal DSO suggests the revenue that is happening is being collected fine. The diagnosis: inventory management and pricing problem, not a receivables issue. Management should review purchasing, markdown timing, and product mix before adding more stock.
Key Terms
| Term | Definition | Related Concept |
|---|---|---|
| Liquidity ratio | Measures ability to meet short-term obligations | Current ratio, quick ratio |
| Solvency ratio | Measures long-term financial stability relative to debt | Debt-to-equity, TIE |
| Current ratio | Current assets divided by current liabilities | Quick ratio, working capital |
| Quick ratio | Liquid current assets (excluding inventory) divided by current liabilities | Current ratio, acid-test |
| Times interest earned | EBIT divided by interest expense; measures debt service capacity | Solvency, EBIT |
| Gross profit margin | Gross profit as a percentage of net sales | Net profit margin, COGS |
| Return on equity (ROE) | Net income divided by average stockholders' equity | DuPont analysis, leverage |
| DuPont analysis | Decomposition of ROE into margin, asset turnover, and leverage multiplier | ROA, financial leverage |
| Inventory turnover | COGS divided by average inventory; how many times inventory cycles per year | Days inventory outstanding |
| Days sales outstanding (DSO) | Average number of days to collect receivables | Receivables turnover, credit policy |
| Asset turnover | Sales divided by average total assets | Efficiency, ROA |
| Debt-to-equity ratio | Total liabilities divided by total stockholders' equity | Leverage, debt covenants |
Common Mistakes
Misconception: A higher current ratio always means the company is more financially healthy. Why it's wrong: A high current ratio can result from excess inventory that is slow-moving, idle cash that earns no return, or large prepaid expenses. These inflate current assets without improving the company's ability to meet obligations quickly. A current ratio of 5.0 with a quick ratio of 0.5 is a signal of inventory accumulation, not strength. Correct understanding: Assess liquidity using both the current ratio and the quick ratio together. A gap between the two means a significant portion of current assets is inventory or prepaid items. The quick ratio gives a more realistic picture of immediate payment capacity.
Misconception: You can directly compare the ratios of a US LIFO company with a FIFO competitor without any adjustment. Why it's wrong: A US company using LIFO during a period of rising prices will show higher COGS, lower inventory on the balance sheet, and lower net income than a FIFO peer with identical transactions. This means inventory turnover, gross margin, ROA, and ROE will all be affected by the method — not just by underlying operational performance. Correct understanding: When comparing companies with different inventory accounting methods, adjust for the LIFO reserve (disclosed in the notes). Add the LIFO reserve to the LIFO company's inventory and reduce COGS by the annual change in the reserve. Only then are the companies' ratios on a comparable basis.
Misconception: Return on equity is the single best measure of a company's overall performance. Why it's wrong: ROE can be boosted by increasing financial leverage — taking on more debt reduces the equity denominator, inflating ROE even if operations are deteriorating. A company buying back shares with debt will show rising ROE while potentially becoming riskier. Correct understanding: ROE should be analyzed using the DuPont framework to understand whether the return is driven by operational efficiency (profit margin, asset turnover) or financial leverage (equity multiplier). High ROE from high leverage may actually represent higher risk for shareholders rather than superior management.
Comparison and Connections
| Feature | Current Ratio | Quick Ratio | Cash Ratio |
|---|---|---|---|
| Formula | Current assets ÷ Current liabilities | (Cash + Investments + Receivables) ÷ Current liabilities | Cash ÷ Current liabilities |
| Excludes | Nothing from current assets | Inventory, prepaid expenses | Everything except cash |
| Strictness | Least strict | Moderate | Most strict |
| Best used when | Inventory is liquid and turns quickly | Inventory is slow or uncertain | Assessing absolute minimum liquidity |
| Typical US benchmark | 1.5–2.0 (industry-dependent) | 1.0+ preferred | Context-dependent |
| Weakness | Inflated by slow-moving inventory | Ignores inventory that does sell quickly | Too conservative for most operational analysis |
Practice Questions
Recall
Q1. Write the formula for times interest earned and state what a result of 2.0x means in practical terms.
Answer guidance: TIE = EBIT ÷ Interest expense. A result of 2.0x means the company earns twice its interest obligation from operating earnings — it could afford to see earnings drop by 50% and still cover interest. Most US lenders want to see at least 3.0x before extending significant credit.
Q2. What is the difference between inventory turnover and days inventory outstanding, and what does each measure in plain terms?
Answer guidance: Inventory turnover = COGS ÷ Average inventory; it tells you how many complete cycles inventory goes through per year. DIO = 365 ÷ Inventory turnover; it converts this to the average number of days inventory sits before being sold. A turnover of 10x means DIO of 36.5 days — inventory sells in about 5 weeks on average.
Understanding
Q3. Explain in your own words why the DuPont decomposition of ROE is more informative than the single ROE formula.
Answer guidance: The single ROE formula (Net income ÷ Equity) tells you the result but not why. DuPont separates ROE into three drivers: the net profit margin (pricing and cost efficiency), asset turnover (how hard assets work), and the equity multiplier (how much leverage is used). Two companies with 15% ROE could look identical until DuPont reveals one earns it through high margins with low leverage, while the other earns it through heavy borrowing despite thin margins — very different risk profiles.
Q4. A company's gross profit margin is declining even though total revenue is growing. Explain two different business reasons this could happen and what each would indicate to an analyst.
Answer guidance: First: input costs are rising faster than selling prices (cost pressure from suppliers or commodities). Second: the company is cutting prices to drive volume (competitive pricing war or market share strategy). The first suggests supplier or commodity risk; the second suggests competitive pressure. An analyst would look at unit price trends, COGS composition, and industry pricing dynamics to distinguish between them.
Application
Q5. A company has current assets of $600,000 (including inventory of $350,000 and prepaid expenses of $20,000) and current liabilities of $300,000. Calculate both the current ratio and the quick ratio, and interpret the difference.
Answer guidance: Current ratio = $600,000 ÷ $300,000 = 2.0. Quick assets = $600,000 − $350,000 − $20,000 = $230,000. Quick ratio = $230,000 ÷ $300,000 = 0.77. The gap reveals that most of the current asset base is inventory. A quick ratio below 1.0 means that if inventory cannot be sold quickly, the company may struggle to cover current liabilities. Inventory liquidity and turnover should be investigated further.
Q6. A US apparel retailer reports COGS of $4,800,000, beginning inventory of $600,000, and ending inventory of $1,200,000. Calculate inventory turnover and days inventory outstanding. What does the result suggest?
Answer guidance: Average inventory = ($600,000 + $1,200,000) ÷ 2 = $900,000. Inventory turnover = $4,800,000 ÷ $900,000 = 5.33x. DIO = 365 ÷ 5.33 = 68.5 days. Ending inventory has doubled, dragging the average up. If the industry average is 6–8x (45–60 days), this retailer is slower than peers, which could indicate over-buying, demand weakness, or excess seasonal merchandise — a risk factor for future markdowns.
Analysis
Q7. Two US manufacturers have identical ROE of 18%. Company A has a net profit margin of 12%, asset turnover of 1.5, and equity multiplier of 1.0. Company B has a net profit margin of 3%, asset turnover of 1.0, and equity multiplier of 6.0. Analyze which company's ROE is more sustainable and why.
Answer guidance: Verify: Company A ROE = 12% × 1.5 × 1.0 = 18%. Company B ROE = 3% × 1.0 × 6.0 = 18%. Company A achieves its return through genuine operational efficiency — strong margins and asset productivity with no leverage. Company B achieves the same ROE through extreme leverage (equity multiplier of 6 means roughly 83% debt financing). Company A's ROE is far more sustainable: it does not depend on favorable debt markets, is less vulnerable to rising interest rates, and has no risk of covenant violations. Company B's high leverage means any earnings decline or credit market tightening could trigger financial distress.
Q8. An analyst is comparing two grocery chains. Chain X uses LIFO and shows inventory turnover of 18x. Chain Y uses FIFO and shows inventory turnover of 22x. Prices have been rising for two years. Analyze whether the raw turnover figures are directly comparable and explain what adjustment would be needed.
Answer guidance: They are not directly comparable. Chain X's LIFO inventory balance is lower (held at older, lower cost layers), which inflates inventory turnover because the denominator (average inventory) is smaller than FIFO would produce. Chain Y's FIFO inventory balance is higher (reflects current prices), which slightly depresses turnover. To compare fairly, add Chain X's disclosed LIFO reserve to its inventory balance when calculating turnover. After adjustment, the true operational difference in inventory velocity may be smaller — or reversed. Analysts at sell-side firms routinely make this LIFO-to-FIFO conversion before including inventory turnover in peer comparison reports.
FAQ
How do I know what a "good" ratio looks like for a specific company?
There is no universal good number — it depends on industry, business model, and economic conditions. US retail typically has current ratios below 2.0 and inventory turnover above 6x; software companies have almost no inventory but high profit margins. The best approach is to compare: (1) the company against itself over 3–5 years (trending better or worse?), (2) the company against close peers in the same industry using data from SEC 10-K filings, and (3) the company against published benchmarks from sources like Dun & Bradstreet or industry trade associations.
Does ratio analysis work for start-ups or companies with no earnings?
Traditional profitability ratios (net margin, ROE, ROA) break down for companies with negative earnings. Analysts covering start-ups or high-growth tech companies often substitute cash-flow-based ratios — operating cash flow to revenue, FCF yield, FCF per share — or use forward estimates. Liquidity and solvency ratios remain meaningful regardless of profitability. The SEC requires the same financial statement disclosures for all public companies, so the raw data is available even when traditional profitability ratios are negative.
Why might a company with a very high ROE actually be riskier than a competitor with moderate ROE?
High ROE can result from high financial leverage — using a lot of borrowed money reduces the equity denominator. If a company finances itself mostly with debt and earns modest profits, the ROE calculation can produce an impressive number. But high debt means high interest obligations, exposure to rising rates, and the risk of covenant breaches if earnings dip. The DuPont equity multiplier captures this: a multiplier above 3.0 or 4.0 usually signals leverage-driven ROE that deserves scrutiny alongside the debt-to-equity ratio and times interest earned.
Are efficiency ratios like DSO affected by how a company records revenue?
Yes. Under ASC 606 (US GAAP revenue recognition), some companies recognize revenue before cash is received — for instance, at contract delivery rather than at invoice payment. This creates accounts receivable. If a company books revenue aggressively (earlier), receivables rise and DSO increases even if collections have not worsened. Conversely, a company that uses channel stuffing (shipping unsold goods to distributors to inflate revenue) will show rising DSO as those distributors slowly pay. SEC enforcement cases frequently involve DSO as an early indicator of problematic revenue recognition.
Can a company manipulate its ratios, and how would I detect it?
Yes, legally and illegally. Legal manipulation includes timing large asset purchases near year-end (to temporarily inflate asset turnover by keeping the denominator small), drawing down inventory before the balance sheet date (to boost inventory turnover), or paying off short-term debt just before year-end (to improve the current ratio — called "window dressing"). Illegal manipulation includes fictitious revenue, understated liabilities, and inventory fraud. Detection methods include: comparing year-end balances to quarterly averages, reading the MD&A and notes in SEC filings for changes in accounting policies, watching for cash flow that consistently lags reported income, and comparing the company's ratios to peers for unexplained outliers.
Quick Revision
- Four ratio categories: liquidity (short-term), solvency (long-term debt), profitability (earnings), efficiency (asset use).
- Current ratio = Current assets ÷ Current liabilities; includes all current assets.
- Quick ratio excludes inventory and prepaid expenses — a stricter liquidity measure.
- Debt-to-equity = Total liabilities ÷ Equity; higher ratio means more creditor financing.
- Times interest earned = EBIT ÷ Interest expense; below 1.5x is a warning sign; 3.0x is a typical loan covenant minimum.
- Gross profit margin = Gross profit ÷ Sales; net profit margin = Net income ÷ Sales.
- ROA = Net income ÷ Average total assets; ROE = Net income ÷ Average equity.
- DuPont: ROE = Net profit margin × Asset turnover × Equity multiplier.
- Inventory turnover = COGS ÷ Average inventory; DIO = 365 ÷ inventory turnover.
- DSO = 365 ÷ Receivables turnover; above industry norm signals slow collections.
- Ratios must be compared over time, against peers, and with accounting policy differences in mind.
- LIFO users have lower inventory balances — their turnover ratios are not directly comparable to FIFO users.
Related Topics
Prerequisites
- Financial Statements (income statement, balance sheet, and cash flow statement provide all the raw numbers)
- Inventory Valuation (inventory method affects COGS, inventory balance, and multiple ratios)
Related Topics
- Cash Flow Analysis (operating cash flow ratios supplement accrual-based ratios)
- Depreciation and Amortization (depreciation method affects net income, assets, and profitability ratios)
Next Topics
- Accounting Standards and Practices (FASB and SEC rules govern the financial statements that ratios are built from)
- Managerial Accounting (ratios extend into internal decision-making, budgeting, and performance management)