Price to Book Ratio Calculator: P/B From Market Cap and Equity
Work out a stock's price-to-book ratio — the balance-sheet valuation metric that value investors love and growth investors ignore, for opposite-but-valid reasons.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | P/B ratio (market cap per $1 of book equity) |
|---|---|
| $2B / $1B equity | $2.00 |
| $50B / $40B (bank) | $1.25 |
| $10B / $500M (software) | $20.00 |
| $800M / $1.2B (sub-1) | $0.67 |
How This Calculator Works
Enter market capitalization and shareholders' book equity. The calculator divides one by the other to give P/B — read as 'dollars of market cap per dollar of book equity'.
The Formula
Cost per Unit
Total Amount is the full cost or price, Quantity is the number of units it covers
Worked Example
A $2B market cap company on $1B of book equity trades at a 2x P/B. Banks and insurance companies typically trade at 0.8x to 1.5x P/B; industrial businesses 1x to 3x; software and high-growth tech 5x to 20x or higher because their value lives in IP, brand, and future earnings rather than physical assets.
Key Insight
P/B has split into two stories. For asset-heavy businesses (banks, REITs, insurance, basic industry), book value approximates economic value and P/B is a meaningful indicator — buying at 0.7x book historically beats buying at 1.5x book for the same business. For asset-light businesses (software, brands, biotech), book value reflects almost nothing of what makes the business valuable, and P/B becomes nearly meaningless. Use the metric where it fits the business.
Why P/B works for banks but fails for software
Banks have book values that closely approximate economic value because their assets (loans, securities) are marked at amortized or fair value, and their liabilities (deposits) are at face value. A bank trading at P/B 1.0 is roughly worth its tangible asset base. Banks trade at P/B 1.0-1.5 typically; above this signals premium franchise value (Wells Fargo, JPM at 1.5-2.0); below 1.0 signals distress or capital concerns.
Software companies have book values dramatically below economic value. R&D expense ($billions for Microsoft, Apple, Google annually) creates valuable IP but doesn't create accounting book value. Brand-building marketing produces valuable customer relationships but isn't capitalized. Result: Microsoft P/B ~12, Apple P/B ~50, Google P/B ~6 — clearly the book value doesn't reflect economic value.
For accurate valuation: use P/B for asset-heavy businesses (banks, insurance, utilities, capital-intensive industrials), and use other metrics for asset-light businesses (P/E or EV/EBITDA for software, P/S for high-growth tech, EV/Sales for venture-stage). Cross-applying P/B to inappropriate industries produces misleading conclusions.
Goodwill — the asset that may not be an asset
When companies acquire other companies for more than tangible book value, the difference is recorded as 'goodwill' on the balance sheet. Goodwill is technically an asset but represents nothing tangible — it's the premium paid above tangible book value for the acquisition's perceived synergies, brand value, customer relationships, etc.
Many large U.S. companies have substantial goodwill: GE 30%+ of total assets historically; Verizon ~$30B; AT&T ~$70B+. The acquirer paid this much above tangible book — sometimes justified by synergies that materialize, sometimes destroying value when acquisitions fail. Goodwill impairments (writing down goodwill as failure to realize expected synergies) totaled $1+ trillion across U.S. companies 2000-2020.
For accurate valuation, separate tangible book value from goodwill. Tangible Book Value = Shareholders Equity − Goodwill − Other Intangibles. Tangible P/B is the more conservative measure — closer to the worst-case liquidation value. For distressed-asset analysis, use tangible P/B; for going-concern analysis where IP and brand value matter, use full P/B.
Median P/B by U.S. industry sector (Damodaran 2024)
Reference P/B benchmarks by sector. Higher P/B is justified by higher ROE; cross-sector comparison without ROE adjustment is misleading.
| Sector | Median P/B | Notes |
|---|---|---|
| Software (Internet) | ~10 | Asset-light; high ROE |
| Pharma (Branded) | ~5 | IP-driven |
| Tobacco | ~16 | Brand-driven; very high ROE |
| Beverage (Alcohol) | ~9 | Brand-driven |
| S&P 500 (overall) | ~4.5 | |
| Healthcare Services | ~3.5 | |
| Retail (General) | ~3 | |
| Industrials (heavy) | ~2 | |
| Banks (Money Center) | ~1.3 | Asset-heavy |
| Banks (Regional) | ~1.1 | Asset-heavy |
| Insurance (Life) | ~0.9 | Capital-intensive |
| Utilities | ~1.7 | Asset-heavy regulated |
P/B should be evaluated alongside ROE — the implicit yield. High P/B is justified by high ROE; low P/B requires high ROE to produce attractive returns. For asset-heavy businesses, P/B and ROE together inform return on incremental investment.
Frequently Asked Questions
How is P/B ratio calculated?
Divide market capitalization by shareholders' book equity. A $2B market cap on $1B of book equity is a 2x P/B.
What is book equity?
Shareholders' equity from the balance sheet — total assets minus total liabilities. Also called book value, common equity, or net worth (in a corporate context).
What is a good P/B ratio?
Banks and insurance: 0.8x to 1.5x; industrials: 1x to 3x; software and high-growth tech: 5x+. Below 1.0x sometimes signals undervaluation, sometimes signals impaired assets — context matters.
Why doesn't P/B work for software companies?
Book equity reflects historical accounting cost of physical assets. Software companies hold most of their value in IP, brand, and earning power — none of which sits on the balance sheet at fair value. P/B for software often looks absurdly high without being a red flag.
When does P/B signal trouble?
When a normally asset-heavy business trades far below 1.0x book — for banks, that often indicates the market expects writedowns on loan or investment portfolios. Persistently low P/B without recovery usually signals real impairment, not undervaluation.
When is this calculator unreliable?
For asset-light businesses (software, branded consumer, pharma) where book value understates economic value — use P/E or P/S instead. Also unreliable when goodwill inflates book value (tangible book is the more conservative measure), when book value is being marked down due to impairment (the P/B looks misleadingly attractive during the markdown), or when liabilities are off-balance-sheet (leases, pensions can materially understate true book equity).
References & Authoritative Sources
- U.S. Securities and Exchange Commission (SEC) — Form 10-K Balance Sheet Requirements · consulted June 1, 2026 · GAAP definitions of book value and shareholders' equity
- Damodaran Online (NYU Stern) — Industry P/B Benchmarks by Sector · consulted June 1, 2026 · Authoritative academic source for industry P/B benchmarks
- Investopedia — Price-to-Book Ratio — Price-to-Book Ratio (P/B Ratio) Definition · consulted June 1, 2026 · Standard P/B methodology reference
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Methodology & Review
Price-to-book ratio (P/B) equals stock price / book value per share. Book value per share = shareholders' equity / shares outstanding. The calculator returns the P/B ratio. P/B is most useful for asset-heavy businesses where book value approximates economic value: banks, insurance companies, asset-heavy industrials, REITs. Less useful for asset-light businesses where book value substantially understates economic value (tech, brand-driven consumer, IP-driven pharma). U.S. averages: banks 1.0-1.5; insurance 1.0-1.4; REITs 1.5-2.5; S&P 500 overall ~4.5. RELIABILITY: Reliable for asset-heavy businesses with stable book values. Less reliable for asset-light businesses (book value understates economic value because R&D, brand, and IP are expensed not capitalized), for companies with substantial intangibles from acquisitions (goodwill inflates book without adding economic value), or for businesses experiencing distressed asset values (book may overstate realizable value).
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