Financial Ratios Cheat Sheet: Every Key Ratio Explained with Formulas and Benchmarks

Financial ratios are the language of stock analysis. They let you compare companies across industries, track a single company over time, and identify where a business is strengthening or weakening. The problem is that ratios without context are meaningless - a P/E of 20 might be cheap for a software company and expensive for a utility.

This guide organizes every major financial ratio into five categories: valuation, profitability, leverage, growth, and efficiency. Each entry includes the formula, how to interpret it, and sector-specific benchmarks where they apply.

Section 1: Valuation Ratios

Valuation ratios measure how much you are paying for a business relative to some measure of its value or output. They are the most commonly cited ratios in investing because they directly speak to the price paid versus what is received.

Price-to-Earnings Ratio (P/E)

Formula: Market Price per Share / Earnings per Share (EPS)

The P/E ratio tells you how many dollars investors are paying for each dollar of annual earnings. A P/E of 20 means investors pay $20 for $1 of earnings - an earnings yield of 5%.

Trailing P/E uses reported earnings over the last 12 months. Forward P/E uses analysts' earnings estimates for the next 12 months. Forward P/E is more forward-looking but subject to estimate revision risk.

Interpretation guide:

• P/E below 10: Often found in deep cyclicals (energy, steel), distressed companies, or genuinely undervalued situations. Warrants investigation into why the market assigns low earnings multiple.
• P/E of 15-20: Roughly in line with the long-run S&P 500 historical average, suggesting fair value for a stable business.
• P/E of 25-40: Typical for growth companies where investors are paying for future earnings growth, not just current earnings.
• P/E above 50: Requires exceptionally high growth expectations to justify. Small misses on growth can cause large valuation corrections.

P/E is not meaningful for companies with negative or near-zero earnings. Use revenue or cash flow multiples instead.

Price-to-Sales Ratio (P/S)

Formula: Market Capitalization / Annual Revenue (or Market Price per Share / Revenue per Share)

P/S is most useful for pre-profit companies where P/E cannot be calculated. It measures how much investors pay for each dollar of revenue.

For high-growth software companies, P/S ratios of 5-15x are common in bull markets. Consumer staples companies typically trade at 1-3x sales. Retailers and distributors with thin margins often trade below 1x sales.

P/S must be interpreted alongside margin profile. A 20% operating margin business deserves a higher P/S than a 5% margin business growing at the same rate, because each dollar of revenue converts to far more profit.

Price-to-Book Ratio (P/B)

Formula: Market Price per Share / Book Value per Share

Book value is shareholders' equity - total assets minus total liabilities. P/B compares market price to accounting net worth.

P/B is most relevant for financial companies (banks, insurance) where assets are primarily financial instruments that can be valued relatively accurately. Banks trading at 1.2-1.5x book are typically fairly valued; banks trading below book (P/B less than 1) may indicate market concern about asset quality or earnings power.

For asset-light businesses like software companies, P/B is less informative because intangible assets (brand, intellectual property, software) are not fully reflected in book value. A software company might trade at 15-30x book because its economic value far exceeds its accounting net worth.

Caveat: Book value includes goodwill from past acquisitions. Stripping out goodwill to calculate tangible book value gives a more conservative view of hard asset value.

EV/EBITDA

Formula: Enterprise Value / EBITDA

Enterprise value = Market Capitalization + Net Debt (Total Debt minus Cash and Equivalents) EBITDA = Earnings Before Interest, Taxes, Depreciation, and Amortization

EV/EBITDA is preferred over P/E for several reasons. It is capital structure neutral (it includes debt in the numerator), making comparisons between heavily and lightly leveraged companies more meaningful. It adds back depreciation and amortization, which can distort earnings for capital-intensive businesses.

Typical EV/EBITDA benchmarks:

• Utilities and telecom: 8-12x
• Industrials and consumer staples: 10-15x
• Technology: 15-25x (often higher for software)
• Healthcare services: 12-18x

An acquisition premium typically adds 30-40% to pre-deal trading multiples, so a company trading at 12x EBITDA in a sector where deals are done at 14-16x might represent potential interest from acquirers.

Free Cash Flow Yield (FCF Yield)

Formula: Free Cash Flow per Share / Market Price per Share (or Total FCF / Market Cap)

FCF = Operating Cash Flow - Capital Expenditures

FCF yield is the inverse of a price-to-FCF multiple. A 5% FCF yield means a company generates $5 of free cash flow for every $100 of market capitalization.

FCF yield is particularly useful because free cash flow is harder to manipulate than earnings. Earnings can be affected by accounting choices; cash is cash. High FCF yield combined with strong returns on invested capital is a classic value investor signal - a company generating significant cash relative to its price.

FCF yield above 7-8% for a stable, growing business has historically been an indicator of potential undervaluation. FCF yield below 2% requires confidence in future growth to justify.

Section 2: Profitability Ratios

Profitability ratios measure how efficiently a company converts revenue into profit and how well it uses its capital base to generate returns.

Gross Margin

Formula: (Revenue - Cost of Goods Sold) / Revenue

Gross margin is the first profitability checkpoint. It shows what percentage of revenue remains after paying direct production costs. Everything above gross profit must fund operating expenses, R&D, sales and marketing, interest, and taxes.

Benchmarks vary dramatically by sector:

• Software/SaaS: 65-80%+
• Pharmaceuticals: 60-75%
• Medical devices: 50-65%
• Consumer goods: 35-55%
• Retail: 25-45%
• Automotive: 10-20%
• Food distribution: 5-15%

Gross margin trend is as important as the level. Expanding gross margin as a company scales suggests operating leverage. Contracting gross margin may signal pricing pressure, rising input costs, or product mix shift toward lower-margin offerings.

Operating Margin

Formula: Operating Income (EBIT) / Revenue

Operating margin captures profitability after all operating expenses including R&D, sales and marketing, and G&A. It shows the economic efficiency of the core business before financing costs.

Operating margin expansion over time is a sign of improving business quality - revenue growing faster than costs. Contraction warrants investigation: is it cyclical cost pressure, competitive pricing dynamics, or strategic investment in growth?

Net Profit Margin

Formula: Net Income / Revenue

Net margin is the bottom line - what percentage of revenue flows through to shareholders after all costs including taxes and interest. For capital-light businesses, net margin is a useful comparator. For capital-intensive businesses with high debt, comparing operating margins is more informative.

Return on Invested Capital (ROIC)

Formula: NOPAT / Invested Capital

NOPAT = Net Operating Profit After Tax = Operating Income x (1 - Tax Rate) Invested Capital = Total Equity + Total Debt - Excess Cash (or alternatively, Total Assets minus Non-interest-bearing Current Liabilities)

ROIC is arguably the most important profitability ratio for long-term investors. It answers the fundamental question: for every dollar this company has invested in its business, how much profit does it generate?

A business with ROIC consistently above its weighted average cost of capital (WACC) is creating value. A business earning ROIC below its cost of capital is destroying value even if it reports positive earnings.

Benchmarks:

• World-class businesses: ROIC 20-50%+ (software platforms, consumer brand franchises)
• Strong businesses: ROIC 12-20%
• Average: ROIC 8-12% (roughly equal to cost of capital)
• Value-destroying: ROIC below 8%

Return on Equity (ROE)

Formula: Net Income / Shareholders' Equity

ROE measures how efficiently management generates profit from equity capital. The DuPont decomposition breaks ROE into three components: Net Margin x Asset Turnover x Financial Leverage.

This decomposition is important because high ROE can come from different sources. A company with 15% ROE driven by 15% net margins and modest leverage is fundamentally different from a company with 15% ROE driven by 2% margins but very high financial leverage. The first has a durable competitive position; the second is amplifying thin margins with debt risk.

Return on Assets (ROA)

Formula: Net Income / Total Assets

ROA measures how efficiently total assets - both debt and equity financed - generate profit. It is less distorted by leverage than ROE.

Banks are often evaluated on ROA because their asset base (loan portfolios) is central to their business model. A well-run commercial bank targeting ROA of 1.0-1.5% is considered solid performance.

Section 3: Leverage and Liquidity Ratios

Leverage ratios measure financial risk - how much debt a company carries relative to its earnings, assets, or equity, and whether it can meet near-term obligations.

Debt-to-Equity Ratio (D/E)

Formula: Total Debt / Shareholders' Equity

D/E above 1.0 means a company has more debt than equity. High D/E is not inherently bad - capital-intensive businesses with stable cash flows (utilities, REITs, telecom) routinely operate with D/E of 1.5-3.0 because stable cash flows can support debt service.

For cyclical businesses where earnings are volatile, high D/E creates real risk. A steel company with D/E of 2.0 that enters a down cycle with compressed earnings may struggle to service debt. The same leverage at a utility is manageable.

Net Debt / EBITDA

Formula: (Total Debt - Cash) / EBITDA

Net debt to EBITDA is one of the most commonly used leverage metrics by credit analysts and acquirers. It shows how many years of operating earnings it would take to pay off net debt.

General benchmarks:

• Below 1.0x: Conservatively levered, significant financial flexibility
• 1.0x - 2.5x: Moderate leverage, typical for investment-grade companies
• 2.5x - 4.0x: Elevated leverage, common in LBO-backed businesses
• Above 4.0x: High leverage, stress scenario vulnerability

Interest Coverage Ratio

Formula: EBIT / Interest Expense

Interest coverage tells you how many times over a company can cover its interest payments from operating earnings. A ratio below 2.0x means more than half of operating income goes to interest, leaving little cushion for earnings volatility.

Investment-grade companies typically maintain interest coverage above 4-5x. Below 2x is distress territory for cyclical businesses.

Current Ratio

Formula: Current Assets / Current Liabilities

Current ratio measures short-term liquidity - whether a company can meet obligations coming due within 12 months. A ratio above 1.0 means current assets exceed current liabilities.

A ratio of 1.5-2.0x is generally considered healthy. Below 1.0 may indicate liquidity pressure, though some businesses with predictable receivables and tight inventory management (like large retailers) operate comfortably below 1.5x.

Section 4: Growth Metrics

Revenue CAGR

Formula: (Ending Revenue / Beginning Revenue)^(1/n) - 1, where n is the number of years

Revenue compound annual growth rate measures how fast top-line sales have grown on an annualized basis. This smooths out single-year anomalies and gives a normalized growth rate over a full business cycle.

Context is everything: a 10% revenue CAGR is exceptional for a utility, modest for a technology company, and underwhelming for a clinical-stage biotech with a newly launched drug.

EPS Growth

Formula: (Current Year EPS / Prior Year EPS) - 1 (year-over-year), or CAGR over multiple years

EPS growth captures earnings per share expansion, which includes both business growth and share count changes. Companies can boost EPS through earnings growth, margin improvement, or share repurchases. Understanding which driver is at work matters for sustainability assessment.

Analysts frequently distinguish between organic EPS growth (from business operations) and inorganic EPS growth (from buybacks or acquisitions). Buyback-driven EPS growth without underlying earnings growth does not represent compounding value creation in the same way as margin expansion and revenue growth.

Section 5: Efficiency Ratios

Efficiency ratios measure how well a company uses its assets and manages its working capital.

Asset Turnover

Formula: Revenue / Total Assets

Asset turnover shows how much revenue a company generates per dollar of assets. High asset turnover combined with decent margins is the profile of a capital-efficient business.

The DuPont formula connects asset turnover to ROE: ROE = Net Margin x Asset Turnover x Leverage. Improving asset turnover improves ROE without increasing risk.

Retailers and distributors have high asset turnover (often 1.5-3.0x) but thin margins. Software companies have lower asset turnover but high margins. Both approaches can generate strong ROE through different mechanisms.

Inventory Turnover

Formula: Cost of Goods Sold / Average Inventory (or Revenue / Average Inventory)

Inventory turnover shows how many times a company sells through its inventory per year. High turnover indicates efficient inventory management and demand that exceeds supply. Low turnover suggests slow-moving inventory, potential obsolescence risk, or demand weakness.

A company with 12x inventory turnover holds about 30 days of inventory on average. A company with 4x turnover holds about 90 days. Faster turnover reduces working capital requirements and improves free cash flow conversion.

Days Sales Outstanding (DSO)

Formula: (Accounts Receivable / Revenue) x 365

DSO measures how many days on average it takes a company to collect payment after making a sale. Rising DSO can indicate customers having difficulty paying (credit quality deterioration) or the company extending more generous terms to maintain revenue growth.

Falling DSO suggests improved collections efficiency and is a positive cash flow signal. For SaaS companies that bill in advance, DSO is often negative (deferred revenue exceeds receivables), which is a strong cash flow characteristic.

Quick Reference Table: All Ratios at a Glance

Key Takeaways

• Valuation ratios (P/E, EV/EBITDA, FCF yield) tell you what price you are paying; profitability ratios tell you what quality of business you are paying for. Both are necessary.

• ROIC is the most important profitability ratio for long-term investors because it directly measures whether a business is creating or destroying economic value.

• No ratio should be evaluated in isolation. A low P/E on a business with deteriorating margins and rising leverage is not the same as a low P/E on a business with expanding margins and net cash.

• Sector context is essential. A P/B of 0.8x for a bank may be attractive; a P/B of 0.8x for a software company is essentially impossible because intangible assets are not reflected in book value.

• Trend analysis often matters more than a single point in time. Is gross margin expanding or contracting? Is DSO rising or falling? Directional change signals business momentum.

• Free cash flow is harder to manipulate than earnings. When earnings and FCF diverge persistently, the FCF number is usually more reliable.