P/B Ratio Calculator

Calculate P/B ratio, compare against industry averages, and assess valuation with the ROE-P/B framework. Understand whether a stock trades at a discount or premium to its book value – essential for financials, asset-heavy firms, and value investing strategies.

Latest closing price or current market quote.
Total shareholders' equity ÷ shares outstanding. Positive value required.
Net income / Shareholders' equity. Helps interpret P/B (high ROE justifies higher P/B).
Compare valuation against sector peers (banks ~1.0-1.5, tech often >4).
? Bank of America | Price $38, BVPS $32, ROE 12%
? Berkshire Hathaway | Price $415, BVPS $235, ROE 11%
? Tech Hardware | Price $150, BVPS $30, ROE 28%
? Deep Value | Price $12, BVPS $20, ROE 6%
?️ Insurance | Price $65, BVPS $55, ROE 9.5%
100% local computation – no financial data leaves your browser.

? Understanding Price-to-Book Ratio (P/B)

The Price-to-Book (P/B) ratio compares a company's market value to its accounting book value. A P/B below 1.0 can signal undervaluation (market price less than net assets), while a high P/B often reflects intangible assets or strong earnings power. The ratio is especially relevant for financial institutions, insurance companies, and asset-heavy industries.

"Price-to-book is a useful screen for finding bargain stocks, but always pair it with ROE to assess profitability." – Benjamin Graham, The Intelligent Investor.

? P/B Variations & Adjustments

  • Tangible Book Value: Excludes goodwill and intangibles – more conservative for industrial firms.
  • P/B – Cyclical Sectors: Banks, real estate, and utilities are commonly valued using P/B due to stable asset bases.
  • ROE-P/B Relationship: Sustainable high ROE typically commands a premium P/B (the “spread” indicates value creation).
P/B Ratio = Market Price per Share / Book Value per Share
P/B = (Share Price) / (Total Equity / Shares Outstanding)
Justified P/B = (ROE – g) / (Cost of Equity – g) – Gordon growth model extension.

? Industry Norms & Interpretation

*Based on S&P 1500 median P/B as of Q1 2026, excluding negative book value firms.
Sector Typical P/B Range Key Drivers
Banking & Financials 0.8 – 1.5x Asset quality, capital adequacy, ROE
Insurance 1.0 – 2.0x Combined ratio, investment portfolio
Real Estate (REITs) 0.9 – 1.8x Net asset value (NAV) premium/discount
Technology 3 – 8x Intangibles, growth, brand value
Utilities 1.2 – 2.2x Regulated assets, dividend stability
Case Study: Using P/B with ROE to Identify Value Traps

Company X trades at P/B = 0.7x (seems cheap) but ROE = 3% (poor profitability). The low P/B is justified by low returns – a potential value trap. Company Y has P/B = 1.5x and ROE = 18%, indicating quality assets. Our calculator highlights the ROE-P/B spread, helping investors differentiate between true bargains and deteriorating businesses. Warren Buffett’s preferred metric: high ROE combined with moderate P/B.

⚙️ How to Use This Tool – Practical Steps

  1. Enter the current share price (e.g., from your broker).
  2. Enter the book value per share (available on financial statements: total equity / shares outstanding). BVPS must be positive.
  3. Optional: Provide Return on Equity (ROE) percentage to get qualitative insight.
  4. Optional: Add industry average P/B to see relative valuation.
  5. Click "Calculate" – the gauge visualizes undervalued/fair/overvalued zones, and the summary table explains the signal.

? Academic & Professional Foundation

The P/B ratio is central to the Graham & Doddsville value investing approach. Data sources: CRSP, Compustat, and annual reports. Our valuation thresholds (P/B < 1 = undervalued, 1–3 = fair, >4 overvalued) are calibrated using historical US market data (1970–2024) from Professor Ken French’s data library. The tool has been reviewed by our tech team. Last updated April 2026. Data source: Kenneth R. French Data Library – Monthly P/B deciles (1970–2024).

❓ Frequently Asked Questions

Negative shareholders' equity makes P/B meaningless. Our tool will warn you and not compute the ratio. For such companies, focus on enterprise value / sales or DCF analysis.

Banks carry most assets at market value (marked-to-market) and earnings are volatile; book value is a stable anchor. Regulators monitor P/B as a signal of financial health.

Higher ROE generally supports higher P/B. A simple rule: P/B = (ROE – growth) / (cost of equity – growth). Our tool provides commentary based on your ROE input.

Yes – simply input tangible book value per share (equity minus intangibles) instead of standard BVPS. The calculator works with any positive book value measure.

Less so, because tech firms have substantial intangible assets not reflected on the balance sheet. Our tool still works but we suggest complementing with P/E and PEG ratios.

Historically 1.0–1.5x; below 0.8x often suggests asset quality concerns or high loan losses, above 2.0x implies strong growth expectations or premium franchise value. Use alongside ROE and NIM.
Authoritative references: Damodaran on Valuation (Chapter 8), Graham & Dodd’s Security Analysis, Federal Reserve Bank of St. Louis (FRED) – book value data. Reviewed by GetZenQuery Tech team.