What is Price to Book
The price-to-book ratio, written P/B or PB, asks how much the market pays for each dollar of equity capital recorded on the balance sheet. Book value is an accounting construct—assets minus liabilities attributable to common shareholders—while price is the market's live bid for the equity.
P/B is especially common for banks, insurers, and other financials where tangible equity is central to regulation and economics. It also appears in deep-value screens for industrials and cyclicals when earnings are depressed and P/E becomes unreliable.
Benjamin Graham-style investors historically favored low P/B names as a margin of safety, though modern intangible-heavy businesses often trade far above book. Today P/B must be read carefully alongside returns on equity.
Pair P/B with ROE: a company earning high ROE can justify a premium to book, while a low-ROE firm trading above book may be destroying value.
This long-form guide is written for individual investors and analysts who already use research terminals and want glossary depth that matches real screening workflows—not a two-sentence dictionary stub.
You will get a precise definition, a transparent formula block, a worked numerical example, practical usage rules, limitations, key takeaways, and a short FAQ. Related Vest Terminal learn guides and stock pages are linked so you can jump from concept to live data.
Read it once for intuition, then keep it as a reference when a screen or earnings print throws an unfamiliar multiple at you. Consistency in definitions is half of good fundamental work.
See this metric on live stock pages: JPM · BAC
Open TerminalDefinition
Price-to-book is share price divided by book value per share, or equivalently market capitalization divided by total common equity. Book value per share is shareholders' equity attributable to common stock divided by diluted shares.
Some analysts prefer tangible book value, which removes goodwill and other intangibles, especially for banks. A P/B of 1.0 means the market prices the equity at accounting equity. Below 1.0 means a discount to book; above 1.0 means a premium.
Whether that discount is a bargain depends on whether book value is economically real and whether the firm can earn an adequate return on it. Accounting equity is not a liquidation appraisal.
Formula
Example
Consider Harbor Bank. Common equity is $40 billion, diluted shares are 2 billion, so book value per share is $20. The stock trades at $28. P/B is 28 / 20 = 1.4. If Harbor earns a mid-teens ROE with stable credit quality, a 1.4× book multiple can be ordinary for a quality franchise.
A weaker peer, Delta Mutual, also shows $20 book value per share but trades at $14, a P/B of 0.7. The discount looks attractive until you see ROE stuck near 4% and rising charge-offs. The market is pricing the risk that book value itself will be written down through losses.
Outside financials, imagine a manufacturer with heavy plant on the books and a P/B of 0.8 during a downturn. If the assets are specialized and ROIC is poor, liquidation value may be far below accounting book, and the 'cheap' multiple is a trap.
On bank pages such as JPM or BAC, reading P/B next to ROE and capital ratios is the practical workflow.
Screen and compare companies with this metric inside Vest Terminal.
Start FreeHow to Use It
Start with a peer set that shares business model and accounting with the company you are studying. Rank those peers on price-to-book, then ask what the outliers have in common: growth, margins, leverage, or one-time distortions. A lone extreme reading without a story is usually a data or cycle artifact.
Build a small dashboard that places price-to-book next to two supporting metrics rather than reading it alone. For example, valuation multiples need growth and margin context; leverage ratios need coverage; profitability ratios need cash conversion. The goal is a short causal chain, not a larger spreadsheet.
Compare the current print with five years of history for the same issuer. Regime changes in rates, competition, or capital allocation often explain level shifts better than a single-year surprise. When history is short because of a merger, splice carefully or rely more on peer medians.
Translate the ratio into an investment implication in one sentence before you act. If you cannot explain why price-to-book matters for cash flows or risk in plain language, you are not ready to size a position around it.
Typical peer anchors for this guide include JPM and BAC. Open those stock pages in Vest Terminal and verify the live inputs rather than memorizing static textbook examples. Color-code P/B by ROE bands so cheap books with weak returns do not pass as bargains.
Revisit the metric after each earnings release and after any major capital-structure change. Screens go stale; underwriting discipline does not.
Finally, write down the kill criteria: which move in the ratio, or in its supporting metrics, would invalidate your thesis. Predetermined review points reduce narrative inertia.
When you document the metric in an investment memo, include the exact vendor field name, the as-of date, and any adjustments you made. That habit prevents silent methodology drift across quarterly updates.
Teaching the concept to a colleague is a useful test: if your explanation requires unexplained jargon, tighten the definition and restate the economic question the ratio answers.
In portfolio construction, a metric is a filter or a monitoring alert—not a complete thesis. Combine quantitative thresholds with qualitative work on customers, competition, and capital allocation.
Regulatory filings remain the source of truth when third-party data conflicts. A ten-minute check of the 10-K notes often resolves apparent anomalies that screens cannot.
Market regimes change the distribution of 'normal' values. What looked expensive in a zero-rate world can look ordinary when discount rates are higher, and the reverse is also true.
When you document the metric in an investment memo, include the exact vendor field name, the as-of date, and any adjustments you made. That habit prevents silent methodology drift across quarterly updates.
Teaching the concept to a colleague is a useful test: if your explanation requires unexplained jargon, tighten the definition and restate the economic question the ratio answers.
In portfolio construction, a metric is a filter or a monitoring alert—not a complete thesis. Combine quantitative thresholds with qualitative work on customers, competition, and capital allocation.
Regulatory filings remain the source of truth when third-party data conflicts. A ten-minute check of the 10-K notes often resolves apparent anomalies that screens cannot.
Market regimes change the distribution of 'normal' values. What looked expensive in a zero-rate world can look ordinary when discount rates are higher, and the reverse is also true.
When you document the metric in an investment memo, include the exact vendor field name, the as-of date, and any adjustments you made. That habit prevents silent methodology drift across quarterly updates.
Teaching the concept to a colleague is a useful test: if your explanation requires unexplained jargon, tighten the definition and restate the economic question the ratio answers.
Limitations
Accounting policies and vendor definitions can move price-to-book without any change in economics. Always reconcile a surprising screen result to the filing.
Cross-industry rankings flatten important structural differences in capital intensity, regulation, and revenue recognition. Keep comparisons local unless you are explicitly studying sector relative value.
One-time items, restatements, and merger accounting create optical spikes. Prefer trailing multi-year averages for cyclical names.
Point-in-time balance-sheet ratios miss intra-quarter stress. Pair them with cash-flow trends and liquidity footnotes.
Model risk matters for derived metrics that feed valuation. Small input changes can reverse a cheap/expensive label.
Data vendors differ on diluted share counts, trailing windows, and minority-interest treatment. Extreme outliers deserve a source check before a trade.
Key Takeaways
- P/B compares market price to accounting common equity per share.
- It is most useful for banks, insurers, and asset-heavy firms.
- Read P/B with ROE: premium books need premium returns.
- Prefer tangible book when goodwill is large.
- Intangible-heavy compounders often look expensive on P/B by design.
What is Price to Book FAQ
Is buying below book value a good strategy?
Sometimes for financials and deep-value situations, but only if book is real and returns can recover. Blind low-P/B screens catch many value traps.
What is a good P/B ratio?
For quality banks, around or above 1× with solid ROE is common. Universal cutoffs fail across sectors.
Price-to-book vs book value—what is the difference?
Book value is the accounting equity number. Price-to-book is the valuation multiple that divides price by that book value.
Why do tech stocks have high P/B?
Much of their value sits in intangibles and future cash flows not fully capitalized on the balance sheet, so market price far exceeds accounting equity.
Should investors use tangible P/B?
Yes for banks and acquisitive firms where goodwill is material. It is a stricter measure of hard equity.
Can P/B be negative?
If book equity is negative, the ratio is not meaningful for valuation screens.