Price to Book Ratio Calculator

The price-to-book ratio (P/B) divides a company's market price per share by its book value per share, where book value is common stockholders equity from the balance sheet (total equity minus any preferred equity) spread across diluted shares. It compares what the stock market is willing to pay for one share with what the accountants say one share's claim on net assets is worth at historical cost. A P/B of 1.0 means the market values the firm at exactly its accounting net worth; 2.5 means investors pay $2.50 for every $1 of book equity. The gap between price and book is the market's view of intangibles the balance sheet does not record: brand, network effects, future earnings power, and management quality. P/B is one of the original deep-value metrics (Benjamin Graham used it heavily) and is still standard for evaluating banks, insurers, REITs, and other asset-heavy businesses.

It can be either, and that is the hard part. A P/B below 1.0 means the market is paying less than the accounting net worth of the business, which historically has been a starting point for classic value investing. But it can equally signal that the book value itself is about to fall. Watch for three red flags before treating a low P/B as cheap: declining return on equity over multiple years (the business is destroying capital), large intangible assets relative to equity (goodwill from past acquisitions about to be impaired), and falling tangible book value year over year. Sectors structurally trading below 1.0 (regional banks during rate stress, European industrials, distressed real estate) often stay there for years. Pair low P/B with positive ROE and stable tangible book to separate genuine bargains from value traps.

Tangible book value (TBV) is common equity minus goodwill and other intangible assets. Goodwill is the accounting plug that records the premium an acquirer paid above the target's book value in a past deal; intangibles include things like brand names, customer lists, and capitalized software. Both are real for accounting purposes but cannot be liquidated to pay creditors or absorb losses, which is exactly what regulators and investors care about for a bank. Price to tangible book (P/TBV) is the standard metric for US bank valuation: most large banks trade in the 1.0x to 1.8x P/TBV range, and a P/TBV below 1.0 historically marks the cyclical bottom. For acquisitive firms (think serial roll-ups in healthcare, software, or insurance), reported P/B can look reasonable while P/TBV is sky-high, because the entire premium over book is sitting in goodwill that may yet be written down.

Sector ranges vary widely and the metric is only meaningful inside its own peer group. As long-run ballparks: US banks typically trade at 0.8x to 1.5x book and 1.0x to 1.8x tangible book; insurers and REITs cluster around 1.0x to 1.5x; utilities run about 1.4x to 1.8x; the S&P 500 as a whole has averaged roughly 3.0x to 4.0x over the last decade, well above its historical norm. Asset-light sectors trade much higher: software and consumer brands often clear 5x to 10x P/B, and the largest tech platforms have run above 15x. These ratios reflect that most of those firms value is in IP, brands, and network effects that book value never records. Never compare a bank's P/B to a software company's; the metric does not mean the same thing in those two worlds.

P/B and return on equity (ROE) are mechanically linked: P/B = ROE / required return in a simple Gordon-growth model, and more practically P/B = ROE x P/E (the trailing decomposition). That means a stock with a high P/B has to deliver a correspondingly high and sustained ROE, or the multiple compresses. A bank trading at 2.0x book needs durable mid-teens ROE; a bank at 0.8x book is often a 5 to 8 percent ROE story. The implication for screening: do not look at P/B alone. Plot ROE on one axis and P/B on the other across a peer group, and the cheap names are firms with above-average ROE and below-average P/B. Reading the two ratios together gives you the value-investor's classic question (am I paying a reasonable price for the quality I am buying) in a single chart.