Price to Book Ratio (P/B): Formula, Meaning & What Is a Good Ratio

The Price-to-Book ratio compares a stock's market price to its book value — the net asset value on the balance sheet (total assets minus total liabilities). A P/B of 1.0 means the stock is priced exactly at its book value. Below 1.0, you're buying the company for less than its accounting net worth. Above 1.0, investors are paying a premium for intangible value — brand, intellectual property, growth potential — that doesn't appear on the balance sheet.

P/B was central to Benjamin Graham's value investing framework. His strictest criterion required buying stocks below book value (P/B < 1.0), essentially getting the business for less than its liquidation value. While pure "net-net" investing is rare in modern markets, P/B remains highly relevant for capital-intensive industries (banks, REITs, industrials) where tangible assets are the primary value driver. For asset-light businesses like software companies, P/B is less meaningful because their real value lies in code, talent, and customer relationships — none of which appear at fair value on the balance sheet.

Book Value per Share = (Total Assets − Total Liabilities) / Shares Outstanding. It represents the net accounting worth of the company divided equally among all shares. Also called "shareholders' equity per share" or "net asset value per share."

Example: a company with $10B in assets, $6B in liabilities, and 500M shares has book value per share = ($10B − $6B) / 500M = $8.00. If the stock trades at $12, P/B = 1.5x. The $4 premium above book value represents what investors are willing to pay for earnings power, brand value, and growth potential beyond the tangible assets.

Step 1: Find Shareholders' Equity (Total Assets − Total Liabilities) on the balance sheet. Suppose: $4B.

Step 2: Divide by shares outstanding. Suppose 400M shares: Book Value per Share = $10.00.

Step 3: Divide current share price by book value. At $25: P/B = 2.5x.

A P/B of 2.5x means investors value the company at 2.5 times its net accounting worth. For banks (where assets are marked to near-market values), P/B is one of the most important valuation metrics. For tech companies with minimal tangible assets, P/B often exceeds 10x and provides little useful signal — the company's value is in its IP and people, not its balance sheet.

Industry context is everything:

Banking & Financials (target P/B 1.0–2.0): Book value closely approximates real asset value. P/B below 1.0 signals the market doubts asset quality. Above 2.0 reflects premium franchise value.

REITs & Insurance (target P/B 0.8–1.5): Asset-heavy, book value is meaningful but subject to appraisal assumptions.

Industrials & Utilities (target P/B 1.5–3.0): Tangible assets matter but so does operational efficiency.

Technology & Software (P/B often 5–20+): Book value is nearly irrelevant — the real value is in code, patents, and network effects that the balance sheet doesn't capture.

Graham's classic criterion of P/B below 1.0 is still useful for screening deeply undervalued asset-heavy companies. The Graham preset in UQS captures this value philosophy through heavy Valuation weighting (35%).

The book-to-price ratio (B/P) is simply the inverse of P/B. Where P/B of 0.8 means the stock trades at 80% of book value, B/P of 1.25 means book value exceeds market price by 25%. B/P is used in academic finance (particularly the Fama-French value factor) because higher B/P = more "value" — a natural fit for factor models where higher-is-better.

The value premium associated with high book-to-price stocks has been documented across markets and time periods. Stocks with high B/P (low P/B) have historically outperformed on a risk-adjusted basis, though the premium has compressed in recent decades as markets became more efficient. The UQS Valuation pillar captures this value signal through earnings yield, P/FCF, PEG, and EV/EBITDA rather than P/B directly — these cash-flow-based metrics are more reliable across industries.

UQS does not include P/B as a direct scoring metric because its usefulness varies too dramatically by industry. For banks, P/B is essential. For software companies, it's meaningless. Rather than calibrating a single metric that only works for a subset of industries, UQS uses four valuation metrics that work universally: earnings yield, P/FCF, PEG, and EV/EBITDA.

For investors who prioritize book-value-based analysis, the Graham preset weights Valuation at 35% (highest of any preset) and Risk at 20%, capturing the margin-of-safety philosophy that P/B screening embodies. The best value stocks ranking surfaces deeply undervalued companies across all four metrics. Read the full UQS methodology →