What is the Price-to-Book Ratio? Definition, Formula, and Example
The price-to-book ratio (P/B) divides a company's share price by its book value per share, which shows how many dollars the market pays for each dollar of net assets on the balance sheet.
What the Price-to-Book Ratio Means
The price-to-book ratio (P/B) compares a stock's market price with the accounting value of its equity. Book value is what would be left for common shareholders if the company sold every asset at its balance-sheet value and paid off every liability. A P/B of 1.0 means the market values the company at exactly its net assets. A P/B of 3.0 means investors pay $3 for every $1 of book equity, which reflects their view that the business earns returns well above the cost of its assets.
Price-to-Book Ratio Formula
The per-share version:
P/B = Share Price / Book Value per Share
Book Value per Share = (Total Shareholders' Equity − Preferred Equity) / Common Shares Outstanding
The aggregate version gives the same result:
P/B = Market Capitalization / Common Shareholders' Equity
Analysts often use a stricter variant, price-to-tangible-book (P/TBV), which removes goodwill and other intangible assets from equity. P/TBV is the standard for banks because a bank's tangible equity is the capital that absorbs loan losses.
Worked Example: JPMorgan Chase
At December 31, 2024, JPM reported book value per share of $116.07 and tangible book value per share of $97.30. The stock closed the year at $239.71.
- P/B = 239.71 / 116.07 = 2.07x
- P/TBV = 239.71 / 97.30 = 2.46x
For context, large U.S. banks with mid-single-digit returns on equity have traded near or below 1.0x tangible book in stressed periods. JPM's premium reflects a return on tangible common equity above 20% that year. The market pays more than book when a company earns more than its cost of capital on that book.
When Traders Use the Price-to-Book Ratio
- Financials and insurers. Balance sheets for banks, insurers, and brokers are mostly marked financial assets, so book value is close to economic value. P/B and P/TBV are the main valuation multiples in this group.
- Asset-heavy cyclicals. Steel, shipping, autos, and energy names trading below 1.0x book draw deep-value buyers who expect the cycle to turn.
- Pairing with ROE. P/B on its own says little. A stock at 1.5x book with 20% ROE is cheaper on earnings power than a stock at 1.0x book with 5% ROE. The justified multiple scales with ROE relative to the cost of equity.
- Screening for distressed setups. A sudden drop below book after an earnings miss flags a possible overreaction or a real impairment that has not hit the balance sheet yet.
Rank names by valuation and pair P/B with ROE filters on the live scanner.
Limitations and Common Misconceptions
- Asset-light businesses break the ratio. Software, pharma, and consumer brands carry their main assets (code, patents, brand equity) mostly off the balance sheet. A P/B of 15x for a software company does not mean it is overvalued by itself.
- Buybacks shrink book value. Companies that repurchase heavily reduce equity. Some, including MCD, have reported negative shareholders' equity for years, which makes P/B meaningless.
- Historical cost. Property and equipment sit on the books at depreciated cost, not market value. Land bought decades ago is understated, and obsolete inventory or equipment is overstated until it is written down.
- Below 1.0x is not automatically cheap. A discount to book often means the market expects losses that accounting has not yet recognized. Regional banks traded below book in early 2023 for exactly that reason, since unrealized bond losses had not run through equity.
- Goodwill inflates book. Serial acquirers carry large goodwill balances. Use P/TBV when goodwill makes up a large share of equity.