What Is the Price-to-Book Ratio (P/B)?

The price-to-book (P/B) ratio compares a company's stock price to its book value per share — the accounting net worth of the business divided by shares outstanding. It answers one direct question: how much is the market paying for each dollar of the company's net assets?

A stock trading at $30 with a book value per share of $10 has a P/B ratio of 3.0x. The market is paying $3 for every $1 of net assets on the balance sheet.

A stock at $8 with a BVPS of $10 has a P/B of 0.8x — the market values the company at less than its accounting net worth.

TL;DR: The P/B ratio tells you how much you're paying per dollar of a company's net assets. A low P/B can signal an undervalued stock; a high P/B usually reflects strong intangible assets, brand value, or superior earning power. It's especially powerful in asset-heavy sectors like banking, industrials, and energy. Use the P/B ratio filter on ScreenerHub to screen for stocks trading at or below book value.

Why the P/B Ratio Matters for Investors

The P/B ratio is one of the oldest valuation tools in fundamental analysis. Benjamin Graham — the father of value investing and mentor of Warren Buffett — made buying stocks below book value a cornerstone of his strategy. The logic: if you buy a business for less than it is worth on the balance sheet, your downside is inherently limited.

Modern investors use the P/B ratio for several purposes:

• Margin of safety. A stock trading at or below book value provides an accounting floor — you are buying net assets at a discount. This does not guarantee a profit, but it limits the theoretical downside.
• Sector-relative valuation. In capital-intensive industries — banking, insurance, industrials, energy — book value is a primary valuation anchor. P/B comparisons within a sector reveal which stocks are cheap or expensive relative to their peers.
• Quality signal in reverse. Very high P/B ratios in asset-light industries (technology, software) signal that the market is paying a large premium for earnings power and intangibles not captured on the balance sheet. That is not necessarily a warning — it is context.
• Screening foundation. The P/B ratio is a starting point for value investing screens. Combined with profitability metrics like ROE, it helps separate genuinely undervalued stocks from value traps.

How to Calculate the P/B Ratio

The formula is straightforward, but the inputs require care.

Step-by-step example:

If the stock currently trades at $6.00:

The market prices the company at 1.5 times its net book value.

P/B vs. Price-to-Tangible-Book (P/TBV)

Standard book value includes all assets, including intangibles like goodwill, patents, and brand value. These are real but harder to liquidate. Tangible book value strips them out:

For banks and financial institutions, analysts almost exclusively focus on P/TBV because tangible equity is the capital base that regulators measure. A bank trading at 1.0x tangible book is generally considered fairly valued.

What Is a "Good" P/B Ratio?

There is no universal answer. What matters is context: the sector, the company's earning power, and whether current assets are accurately valued on the balance sheet.

General P/B ranges

P/B ratios by sector (U.S. market averages)

P/B ratios differ dramatically by industry. Comparing a software company's P/B to a bank's P/B is not meaningful.

The takeaway: A P/B of 0.9x is normal for a regional bank. The same ratio in a software company would suggest the business is on the edge of insolvency. Always compare P/B within sectors, not across them.

On ScreenerHub, you can combine the P/B filter with a sector filter to ensure you are making like-for-like comparisons.

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How to Use P/B in Stock Screening

The P/B ratio is most powerful when combined with profitability and quality metrics. A low P/B alone tells you the stock is cheap relative to assets — but not whether those assets are generating adequate returns. Here are four practical screens you can build on ScreenerHub:

Screener 1: Classic Graham-style value screen

Find stocks trading at or below book value — the foundation of Benjamin Graham's net-asset approach.

This screen targets companies priced below their net accounting worth with manageable debt and sufficient short-term liquidity. It surfaces distressed-but-solvent businesses that Graham-style investors research for recovery potential.

Caution: Stocks below 1.0x P/B are cheap for a reason. Always investigate why before buying. Common causes: declining industry, persistent losses, heavy debt, or poor asset quality.

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Screener 2: High-ROE, low-P/B quality screen

Find companies that are both earning excellent returns and not overpriced relative to book value.

The combination of high ROE and low P/B is a classic quality-value signal. A company that earns 20% on equity but trades at 1.5x book is significantly more attractive than one earning 5% on equity at the same price. This is the quantitative basis for Warren Buffett's approach to "wonderful companies at fair prices."

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Screener 3: Banking sector valuation screen

Use P/TBV to screen banks and insurers for valuation within their sector.

Banks are best compared to each other on P/TBV. A well-run bank trading near or slightly above tangible book with a dividend yield above 2% is a classic income-oriented value play.

Screener 4: Sector-relative cheapness

Find the cheapest stocks in any sector by filtering for below-average P/B within that sector.

This approach suits investors who have sector conviction — you know where you want to allocate, and you use P/B to find the most attractively priced companies within that thesis.

Try it now: Open the Screener Studio and add a P/B ratio filter. Set it to 0.5–2.0, then add an ROE filter above 10%. You'll have a running quality-value screen in under a minute.

When the P/B Ratio Misleads

The P/B ratio is a powerful tool, but it has important limitations. Understanding when it breaks down saves you from misreading signals.

1. Asset-light businesses have structurally high P/B

A software company that earns $500M in profit per year but carries only $50M in net assets will have an astronomically high P/B — and that is entirely appropriate. The balance sheet simply does not capture the value of its code, talent, customer relationships, or brand.

Mitigation: For technology, healthcare, and consumer brands, use P/E or EV/EBITDA instead of P/B as the primary valuation lens.

2. Intangible-heavy acquisitions inflate book value artificially

When a company acquires another business at a premium, it records goodwill — the excess purchase price above the acquired assets. A company that has made multiple large acquisitions carries substantial goodwill on its balance sheet, making book value appear higher than the underlying hard-asset reality.

Mitigation: Use P/TBV (price-to-tangible-book) rather than standard P/B for companies with significant acquisition history.

3. Share buybacks can distort book value

Aggressive share buyback programs reduce shareholders' equity — and therefore book value — even when the business is healthy and growing. A company that has repurchased stock at prices above book value may show a low or even negative book value, which makes the P/B ratio meaningless or misleading.

Mitigation: Check the trend in BVPS over time. A declining book value due entirely to buybacks is a fundamentally different signal than one caused by operating losses.

4. Asset write-downs are backward-looking

If a company writes down inventory or impairs goodwill, book value drops. The stock price may have already priced this in, making a low P/B appear after the fact rather than as a prospective opportunity.

5. P/B below 1.0x is not automatically cheap

A stock trading below book value is not automatically a bargain. It may be cheap for a reason: assets that are declining in value, a business model that cannot earn adequate returns on those assets, or looming debt obligations that will erode equity. The Graham approach required both low P/B and sufficient financial strength (low debt, adequate liquidity).

P/B and the Relationship to ROE

The most important analytical relationship involving P/B is with Return on Equity (ROE). The two metrics are mathematically linked through what analysts call the "justified P/B" formula:

Where:

• ROE = Return on equity
• g = Expected long-term earnings growth rate
• r = Required rate of return (cost of equity)

The takeaway without the algebra: a company that earns a high return on equity deserves to trade at a premium to book value. Conversely, a company earning a return on equity below its cost of capital deserves to trade below book value.

This is why a bank with ROE of 12% trading at 1.5x book can be fairly valued, while a manufacturer with ROE of 4% at 1.0x book is expensive — the assets are not generating adequate returns.

Rule of thumb: If ROE is below the cost of equity (roughly 8–12% for most businesses), P/B should be below 1.0x. If ROE is above that hurdle, a P/B premium is justified. The higher the ROE advantage, the higher the justified P/B.

On ScreenerHub, filtering for low P/B alongside high ROE is one of the most reliable signals of a quality business trading at a discount.

P/B vs. Other Valuation Ratios

No metric works in isolation. Here is how P/B compares to the other primary valuation ratios — and when to use each.

When P/B is the right primary metric:

• Screening banks, insurers, and financial companies
• Evaluating industrials, utilities, and energy companies with large physical asset bases
• Distressed stock analysis and liquidation-value scenarios
• Identifying classic value opportunities in cyclical sectors

When P/B is insufficient:

• Technology and software companies
• Healthcare and biotech with large intangible pipelines
• Any company with negative or near-zero book value

Key Takeaways

• The P/B ratio divides the stock price by book value per share — telling you how much the market pays per dollar of net assets.
• A P/B below 1.0x means the market values the business below its accounting net worth. This can signal undervaluation or reflect poor asset quality.
• P/B is most useful in asset-heavy sectors: banking, insurance, industrials, and energy. It is nearly meaningless for software and asset-light businesses.
• Always pair P/B with ROE: a low P/B is only attractive if the company earns adequate returns on those assets.
• Use Price-to-Tangible-Book (P/TBV) for banks and companies with significant acquisition goodwill.
• Compare P/B within sectors, never across them — a "low" P/B in tech is higher than a "high" P/B in banking.

Related Articles

• What Is Book Value? — Understand the denominator before using the ratio
• What Is ROE? — The profitability metric that gives P/B its context
• What Is the P/E Ratio? — The most widely used valuation metric
• What Is EV/EBITDA? — A ratio less distorted by capital structure
• How to Screen for Value Stocks — Apply P/B in a complete value strategy
• What Is Debt-to-Equity? — Assess the leverage behind those assets