Price-to-Book Ratio Calculator 2026

A price-to-book (P/B) ratio calculator determines whether a stock is overvalued, undervalued, or fairly valued by comparing its market price to its book value per share. It takes the stock's current market price and the company's book value per share (or total equity and shares outstanding) to calculate the P/B ratio — a key valuation metric used by value investors. It works best when you also compare the result to the industry average, since P/B is most useful for asset-heavy industries and less relevant for service or technology companies.

There's no single 'good' P/B — it varies dramatically by industry. As rough guidelines: banking and insurance (asset-heavy) often trade around 0.8-1.8; manufacturing around 1.0-2.5; technology companies with heavy intangible assets often trade at 3.0-10.0+; real estate around 0.8-1.5. A 'good' P/B is one that's low relative to the company's own historical average and its industry peers, and is supported by solid return on equity (ROE) and growth — not just a low number in isolation.

P/B compares price to book value (net assets); P/E compares price to earnings (profits). P/B is more useful for asset-heavy companies (banks, real estate, manufacturing) and for companies with negative earnings, where P/E doesn't work. P/E is more useful for growth, service, and technology companies where earnings matter more than assets. A company can have a low P/B (cheap assets) but a high P/E (expensive profits), signaling low profitability — using both together gives a more complete picture than either alone.

Tangible book value = total assets − total liabilities − intangible assets (goodwill, patents, trademarks). It's the 'hard' asset value of a company, excluding value that exists only on paper. It matters because standard book value can be inflated by intangibles that may not hold up in a liquidation or downturn — for companies with large intangible assets (tech, pharma, or serial acquirers), tangible book value gives a more conservative, and often more meaningful, P/B calculation.

Yes, if book value is negative — meaning liabilities exceed assets. This happens when a company carries heavy debt, has accumulated large losses, or both. A negative P/B is a major red flag: it suggests the company has negative net worth and may be in severe financial distress. It isn't simply 'very undervalued' — the ratio becomes mathematically meaningless at that point, and any investment thesis should rely on a detailed look at the balance sheet rather than the P/B figure alone.