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Price-to-Book Ratio Calculator
Calculate the P/B ratio for any stock and compare it instantly to sector median book value multiples. Auto-populated from live market data — no spreadsheet needed.
What Is Price-to-Book Ratio?
The price-to-book (P/B) ratio divides a stock's price by its book value per share (shareholders' equity divided by shares outstanding). A P/B of 1.0 means the market values the company at exactly its net asset value; below 1.0 can signal undervaluation relative to liquidation value. Value investors like Benjamin Graham historically sought stocks below 1.5× book value as a margin of safety. For a deeper framework on asset-based valuation, see our Price-to-Book Guide.
P/B Ratio vs. Sector Benchmarks
P/B ratios vary widely by sector — banks and utilities often trade near book value (1–2×) while technology and healthcare companies trade at 5–10× due to intangible assets and growth premiums. Benjamin Graham's classic threshold of P/B < 1.5 is a starting point, not a hard rule. Pair P/B analysis with the Graham Number Calculator for a combined earnings + book value check, or use the NCAV Calculator for deep net-net analysis.
When to Use Price-to-Book Ratio
Banks and financial companies
P/B is the primary valuation metric for banks and insurers. Their assets are largely financial instruments carried at or near fair value, so book value is a reliable proxy for liquidation value. A bank trading below 1× book is often flagging credit quality concerns or return-on-equity problems. A bank trading above 2× is typically delivering high returns relative to its capital base.
Unlike P/E, P/B is immune to loan-loss provisions and one-time charges that distort bank earnings. The key ratio to pair with P/B for banks is return on equity (ROE) — a bank earning 15% ROE deserves a higher P/B than one earning 8%.
Asset-heavy industrials and utilities
Capital-intensive businesses — utilities, real estate, manufacturing — have large tangible asset bases that show up clearly on the balance sheet. P/B tracks whether you're paying a premium or discount to the replacement cost of those physical assets. A utility trading at 1.5× book is paying a moderate premium for its regulated revenue stream.
P/B is less useful for asset-light businesses. A software company's most valuable assets — code, customer relationships, brand — don't appear on the balance sheet. This is why tech companies trade at 7–10× book without being "expensive."
Value screening and deep value
Benjamin Graham's original net-net strategy bought stocks at two-thirds of net current asset value — a far deeper discount than P/B alone. P/B below 1.0 is the modern entry point for value screening: the market values the company at less than its book equity, creating a potential margin of safety if assets can be realized or earnings recover.
For the deepest value cut, use the NCAV Calculator to find stocks trading below liquidation value, or the Graham Number Calculator for a combined earnings + book value screen.
Return on equity context
A high P/B ratio is only justified by high return on equity. If a company earns 25% ROE consistently, the market will pay well above book value because each dollar of equity generates $0.25 of profit per year. A company earning only 5% ROE should trade near book — paying much above 1× book means you're overpaying for below-average returns on assets.
The formula: justified P/B = ROE ÷ cost of equity. At a 10% cost of equity, a company earning 20% ROE justifies a 2× P/B multiple. This is why ROE and P/B move together across sectors and time.
How to Read Your P/B Ratio Results
Below book value — value or value trap?
P/B below 1.0 means the market values the company less than its stated net assets. This can signal deep value — especially for cyclical businesses at trough earnings — or a value trap where assets are overvalued or the business destroys capital. Always check ROE: negative or very low ROE at sub-1× P/B usually means the "cheap" assets aren't generating adequate returns.
Value zone — near asset value
Most banks, utilities, and mature industrial companies trade in the 1–2× range. This is the zone Benjamin Graham targeted for margin of safety. At 1.5× P/B, you're paying a modest premium for ongoing business value above liquidation. Reasonable for low-growth, capital-heavy businesses with predictable cash flows.
Fair to premium — growth embedded
Consumer staples, industrials with strong brands, and healthcare companies often trade here. The market is pricing in intangible value not captured in book equity: brand strength, customer loyalty, intellectual property. A 3× P/B is reasonable for a company earning 15–20% ROE with consistent growth — check that the return on equity justifies the premium.
Premium — intangibles dominate
Technology and high-margin healthcare companies commonly trade above 5× book. Most of their value lives in intangibles — software, patents, network effects, brand — none of which appear on the balance sheet at market value. P/B alone is a poor valuation tool at this level; pair it with P/E, EV/EBITDA, and a DCF model for a complete picture.
P/B Ratio by Sector — Median Benchmarks
| Sector | Median P/B | Why It's Here |
|---|---|---|
| Technology | 7.0× | High intangibles, strong ROE |
| Healthcare | 5.0× | IP-heavy, pricing power |
| Consumer Staples | 5.5× | Durable brands, consistent returns |
| Consumer Discretionary | 5.0× | Brand premiums, asset-light models |
| Communication Services | 4.0× | Network effects, platform dominance |
| Industrials | 3.5× | Moderate intangibles, cyclicality discount |
| Materials | 2.5× | Commodity assets, volume-driven |
| Real Estate | 2.5× | NAV premium for quality portfolios |
| Utilities | 1.8× | Regulated, stable but capital-heavy |
| Energy | 1.8× | Cyclical earnings, tangible assets |
| Financials | 1.4× | Balance sheet businesses, low premium |
Frequently asked questions
What does P/B ratio mean?
P/B (price-to-book) ratio = stock price ÷ book value per share. Book value per share is total shareholders' equity divided by diluted shares outstanding. A P/B of 2× means the market values each dollar of book equity at $2 — a 100% premium to stated net asset value.
Is a lower P/B ratio always better?
No. A very low P/B (below 1×) can mean genuine undervaluation or that assets are impaired and the business is destroying capital. A high P/B for a tech company is normal — most of the value is in intangible assets not on the balance sheet. Always compare P/B within the same sector and pair it with ROE.
What P/B ratio did Benjamin Graham target?
Graham looked for stocks below 1.5× book value as part of his margin of safety framework. He also used the 'Graham Number': the square root of (22.5 × EPS × book value per share), blending P/E and P/B into a single intrinsic value estimate. Use our Graham Number Calculator for this combined check.
Why do bank stocks trade near book value?
Banks hold financial assets (loans, securities) that are carried close to market value, so book value is a reasonable liquidation proxy. A bank earning 12% ROE will trade above 1× book; one earning 6% ROE will trade at or below book. The key driver is return on equity relative to the bank's cost of equity capital.
Why do tech companies have high P/B ratios?
Most of a tech company's value — software, patents, brand, network effects, customer relationships — is not recorded on the balance sheet as an asset. GAAP accounting expenses R&D instead of capitalizing it, so the stated book value understates economic value. A 10× P/B for a profitable software company is not 'expensive' when most of its real assets are intangible.
How is P/B different from P/E ratio?
P/E measures how much you pay for current earnings power; P/B measures how much you pay for the balance sheet's net asset value. P/B is more useful for balance-sheet businesses (banks, real estate, utilities) where assets and their returns are the story. P/E is better for stable, profitable companies where earnings are the key driver of value.