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

Definition

The Price-to-Book (P/B) ratio compares a company's market price to its net asset value per share. A P/B below 1.0 means the market values the company at less than its accounting net worth, the classic deep-value signal that Benjamin Graham used to find stocks trading below liquidation value.

Book value is an accounting construct. It captures historical cost minus accumulated depreciation, plus retained earnings, minus treasury stock. It does not capture the economic value of a strong brand, a loyal customer base, or proprietary software. As a result, P/B is most informative in industries where reported assets approximate economic assets, and least informative where intangibles dominate.

Formula

For most US-listed industrials, the simplified version is sufficient. For acquirers with material goodwill, banks, and insurers, run the calculation twice: once on book and once on tangible book, and use the lower of the two implied multiples as the screening signal.

Worked example: Coca-Cola (KO)

Take a hypothetical Coca-Cola snapshot at $62.00 per share with book value per share of $5.95 and a twelve-month Return on Equity around 40%. The implied P/B is roughly 10.4x. [TODO: verify against the latest /stock/KO feed before publishing.]

A P/B north of 10x looks expensive against the broad market median of roughly 3-4x, but it is fully consistent with Coca-Cola’s mid-thirties Return on Equity, brand moat, and global distribution. The lesson: P/B in isolation is meaningless for a business of this profile. Pair it with ROE, and the picture clarifies — a high ROE justifies a high P/B in proportion to the spread between ROE and cost of equity.

Calculate Price-to-Book

Enter share price and book value per share. The calculator returns P/B and flags the result against the broad-market median.

For a full screening workflow, use the ValueMarkers Stock Screener to filter by P/B, P/TBV, and ROE simultaneously.

P/B bands by industry

Acceptable P/B ranges vary enormously by industry. The table below summarises typical cheap, fair, and expensive bands for major US sectors. Use them as anchors when interpreting a screen, not as hard cut-offs.

P/B vs related valuation multiples

P/B is one of many valuation multiples available to a fundamental analyst. The table below compares P/B with its closest cousins, indicating where each multiple is most useful and where it falls short.

The most powerful combination is P/B paired with Return on Equity. A 2x2 grid that plots P/B on one axis and ROE on the other separates true bargains (low P/B, high ROE) from value traps (low P/B, low ROE) and reasonable growth (high P/B, high ROE).

How value investors use Price-to-Book

Benjamin Graham’s “net-net” framework — buy stocks below two-thirds of net current asset value — was effectively a deep P/B screen, run on the most conservative slice of the balance sheet. Walter Schloss, one of Graham’s most successful disciples, kept it simpler still: pick stocks at or below book value, with low debt and a history of profitability, hold for several years, and let mean reversion do the rest. Over five decades he compounded at roughly 16% net of fees with virtually no exposure to growth stocks.

Modern value investors use P/B in three main ways. First, as a primary screen for banks and insurers, where reported book value approximates economic value reasonably well. Second, as a sanity check on companies generating returns close to or below their cost of equity, where P/B should also compress toward 1.0. Third, as one factor among several in multi-factor “quality value” screens, alongside ROE, debt-to- equity, and the Piotroski F-Score. The ValueMarkers Screener exposes all of these in a single workflow, so a deep-value tail screen can be constructed in seconds.

The principal failure mode of P/B-only screening is the “value trap”: companies whose book value looks cheap precisely because the market correctly suspects that book value will be written down. Examples include serial loss-makers in declining industries, banks with under-reserved loan books, and capital-intensive cyclicals at the peak of the cycle. The fix is to layer in quality metrics — Piotroski F-Score, Return on Equity, and Altman Z-Score — before drawing any research conclusions.

[Javier insight: P/B is the cheapest screen in the world to run and the most expensive screen in the world to act on without confirmation. When I see a sub-1.0x P/B name, my first three questions are: Is book value real? Has it been falling for five years? And is the company earning above its cost of capital today? If the answers are yes/no/yes, it is a candidate. If any answer flips, it is almost certainly a trap.]

Frequently asked questions

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