Price-to-Book Ratio Calculator 2026 | Stock Valuation Tool

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 to calculate the P/B ratio—a key valuation metric used by value investors worldwide. This calculator provides a quick way to assess whether you're paying a fair price for a company's net assets. The best results come from understanding that P/B is most useful for asset-heavy industries and less relevant for service or technology companies. This tool is invaluable for investors.

The price-to-book (P/B) ratio compares a company's market value to its book value (net asset value). Formula: P/B Ratio = Market Price per Share / Book Value per Share. It's important because: (1) It shows how much investors are paying for each rupee of net assets. (2) It's a key metric for value investors to find undervalued stocks. (3) It helps identify potential 'bargains' in the market. (4) It's particularly useful for asset-heavy industries (banking, insurance, manufacturing). (5) A P/B < 1 often indicates the stock is undervalued. Example: Stock at ₹500, Book Value per Share = ₹400 → P/B = 1.25. A low P/B doesn't automatically mean a bargain—it could indicate poor asset quality or declining business prospects. Always check the fundamentals.

The P/B ratio formula is: P/B Ratio = Market Price per Share / Book Value per Share. Book Value per Share = (Total Assets - Total Liabilities - Intangible Assets) / Outstanding Shares. Example: Company has Total Assets = ₹1,000 crore, Liabilities = ₹400 crore, Intangible Assets = ₹100 crore, Outstanding Shares = 10 crore → Book Value = (1000 - 400 - 100)/10 = ₹50 per share. If Market Price = ₹75 → P/B = 75/50 = 1.5. The calculator handles this automatically.

mathematically precise based on inputs, but P/B has significant limitations. The calculator gives exact numbers using the data you provide—but accuracy depends on: (1) Using the correct book value (tangible book value is often more relevant). (2) Understanding that book value may not reflect true asset values (historical cost vs fair value). (3) Recognizing that P/B varies significantly by industry. (4) Considering that a low P/B may indicate poor business quality. P/B is a simple metric with complex interpretation. It's most useful when combined with ROE, growth rates, and other quality metrics. A P/B below 1 may be a bargain or a value trap.

General guidelines for P/B ratio: (1) P/B < 1.0 = Undervalued (trading below book value). (2) P/B 1.0-2.0 = Fairly valued to slightly undervalued. (3) P/B 2.0-3.0 = Moderately overvalued. (4) P/B 3.0+ = Overvalued. However, optimal varies dramatically by industry: (1) Banking/Insurance: Often 0.8-1.8 (asset-heavy). (2) Manufacturing: 1.0-2.5. (3) Technology: 3.0-10.0+ (intangible-heavy). (4) Real Estate: 0.8-1.5. India context: Public sector banks often trade below 1.0 P/B; IT companies often trade at 3.0-6.0 P/B. USA context: S&P 500 average P/B is ~3.0-4.0. A 'good' P/B is one that's low relative to historical averages and industry peers, AND supported by good ROE and growth.

P/B ratio compares price to book value (net assets). P/E ratio compares price to earnings (profits). Example: Company with P/B = 1.5, P/E = 20. P/B shows what you're paying for assets; P/E shows what you're paying for profits. P/B is more useful for: (1) Asset-heavy companies (banks, real estate, manufacturing). (2) Companies with negative earnings (P/E doesn't work). P/E is more useful for: (1) Growth companies. (2) Service and technology companies. P/B and P/E often tell different stories—a company can have low P/B (cheap assets) but high P/E (expensive profits), indicating low profitability. Use both together for a complete picture.

Yes. P/B ratio math works with any currency because it's based on ratios, not absolute values. Whether you're calculating P/B for an Indian stock (₹), US stock ($), UK stock (£), UAE stock (AED), Australian stock ($), or Canadian stock ($), the calculations are identical. What differs are: (1) Accounting standards (IND AS vs GAAP vs IFRS) affect book value calculation. (2) Industry norms vary by country. (3) Market cycles affect typical P/B ranges. Use local benchmarks for comparison.

Book Value is the net asset value of a company according to its balance sheet—total assets minus total liabilities. It's based on historical cost accounting. Market Value is the company's current market capitalization—stock price × outstanding shares. It's based on what investors are willing to pay today. Example: Company Book Value = ₹500 crore, Market Value = ₹750 crore → P/B = 1.5. Book value often understates true asset value because it doesn't reflect: (1) Inflation (assets bought years ago). (2) Intangible value (brand, patents). (3) Future growth potential. Market value reflects these factors. The gap between book and market value shows investor expectations.

Tangible Book Value = Total Assets - Total Liabilities - Intangible Assets (goodwill, patents, trademarks). It's the 'hard' asset value of a company. It matters because: (1) It's more conservative than book value. (2) It reflects assets that have physical or financial substance. (3) It's especially important for value investors. (4) It's more useful for companies with significant intangible assets. Example: Company Book Value = ₹100, Intangible Assets = ₹30 → Tangible Book Value = ₹70. If Market Price = ₹80 → P/B = 0.8, Tangible P/B = 1.14. Companies with large intangible assets (tech, pharma) often have high book values that aren't backed by physical assets. Tangible P/B provides a more conservative view.

P/B ratio uses total book value (including intangible assets). Price-to-Tangible-Book uses only tangible assets (excluding intangibles). Formula: Price-to-Tangible-Book = Market Price / Tangible Book Value per Share. Example: Company P/B = 1.5, Price-to-Tangible-Book = 2.0. The difference comes from intangible assets (goodwill, patents) inflating book value. P/B can make a company look cheaper than it really is if book value is inflated by intangibles. Many value investors prefer tangible P/B for a more conservative valuation. This is particularly important for tech companies, pharmaceutical companies, and companies that have made large acquisitions.

Yes, if book value is negative (liabilities exceed assets). This happens when companies have high debt, accumulated losses, or both. A negative P/B indicates a company has negative net worth—it's technically bankrupt or close to it. Example: Stock Price = ₹100, Book Value per Share = -₹20 → P/B = -5.0. Negative P/B is a major red flag. It suggests the company is in severe financial distress, has too much debt, or has destroyed shareholder equity. Investing in negative P/B stocks is extremely high risk and should only be considered for turnaround situations with strong evidence of improvement.

The Graham Number, developed by Benjamin Graham (the father of value investing), estimates a stock's fair value based on earnings and book value. Formula: Graham Number = √(22.5 × EPS × Book Value per Share). It's related to P/B because it incorporates book value. Example: EPS = ₹20, Book Value = ₹100 → Graham Number = √(22.5 × 20 × 100) = √(45,000) = ₹212. If stock price is ₹150, it's undervalued by Graham's standard. Graham's formula is a rough estimate—it works best for mature, stable companies, not high-growth or cyclical ones. Use it as one screening tool among many.

Banking stocks typically trade at lower P/B ratios because: (1) Banks are asset-heavy. (2) They have high leverage. (3) Book value is a key measure of bank health (capital adequacy). General benchmarks: (1) P/B < 0.8 = Undervalued (common in crises). (2) P/B 0.8-1.5 = Fairly valued. (3) P/B 1.5-2.5 = Moderately overvalued. (4) P/B > 2.5 = Overvalued. India context: PSU banks often trade at 0.5-1.2 P/B; private banks often trade at 1.5-3.0 P/B. USA context: Large banks often trade at 0.8-1.8 P/B. Bank P/B must be evaluated alongside ROE, NPLs, and capital adequacy. A low P/B bank with high NPLs is a value trap.

P/B ratio shows the market value relative to book value—what you pay. ROE (Return on Equity) shows the profitability of the book value—what you get. Together, they form the 'DuPont for Value' framework. Relationship: P/B = ROE × (P/E). High ROE supports higher P/B. Example: Bank A: P/B = 1.5, ROE = 15%. Bank B: P/B = 1.0, ROE = 8%. Bank A's higher P/B is justified by higher ROE. A low P/B with low ROE is a value trap—you're paying 1x book for a business that generates only 8% returns. A high P/B with high ROE might be better value. Always evaluate P/B with ROE.

Yes, but with caution. ETFs and mutual funds have a weighted average P/B based on their holdings. For a fund: (1) Calculate weighted average P/B = Sum of (Fund Weight × Stock P/B). (2) Compare to the fund's historical P/B range. (3) Compare to benchmark P/B. Example: A fund with 50% stocks at P/B 2.0 and 50% at P/B 1.0 → Weighted Average P/B = 1.5. Fund P/B tells you whether the fund is investing in value or growth stocks. A high P/B fund is growth-oriented; a low P/B fund is value-oriented. Use this to align with your investment style.