P/B Ratio — Book Value vs Market Price
Learning Objectives
After reading this chapter, you will be able to:
- Apply: P/B = Market Price ÷ BVPS. P/B = 1 means fair book value pricing; < 1 may be opportunity or trap; > 1 may reflect quality or overvaluation. Primary valuation tool in the banking sector. Always combine with ROE — High P/B + High ROE often justified; Low P/B + Low ROE often trap. Professional analysts ask: Do ROE and Growth justify this P/B?
- Apply P/B Ratio (Price to Book) metrics and formulas using consolidated NSE/BSE annual report data
- Identify red flags when interpreting P/B Ratio (Price to Book): P/B < 1 but Profit declining consistently
- Connect P/B Ratio (Price to Book) analysis to peer comparison and buy/hold/avoid decisions
Introduction
In Chapter 13 we learned Book Value. The natural follow-up question:
"Book Value is ₹100 and the share trades at ₹150 — is that expensive or cheap?"
That is where P/B Ratio helps.
Core Concepts
Financial Terms
| Term | Meaning |
|---|---|
| P/B Ratio | Price to Book Value Ratio — Market Price ÷ BVPS |
| BVPS | Book Value Per Share |
| Premium to Book | P/B > 1 — Market values the company above Book Value |
| Discount to Book | P/B < 1 — Market trades below Book Value |
| Value Trap | Low P/B + Poor fundamentals — looks cheap, is not |
Investment Decision
Never use P/B alone:
| Metric | Role |
|---|---|
| P/B | Valuation anchor |
| ROE | Return quality |
| Debt | Risk check |
| Cash Flow | Sustainability |
| Growth | Future earnings |
Decision: Reasonable P/B + Strong ROE + Controlled Debt + Good Growth → worth further study.
Golden Rule:
P/B shows how the Market prices Net Assets — not whether a stock is cheap. For decisions, combine ROE, Growth, and Business Quality.
"P/B does not tell you if a share is cheap — it tells you how much the Market is paying for Net Assets."
| Metric | Value |
|---|---|
| Share Price | ₹200 |
| BVPS | ₹100 |
| P/B | 2 |
Paying ₹200 for ₹100 of Net Assets — 2× Book Value.
| Metric | Value |
|---|---|
| Share Price | ₹80 |
| BVPS | ₹100 |
| P/B | 0.8 |
₹100 of Net Assets available for ₹80 — attractive at first glance, but the analyst does not stop there.
| P/B | Meaning |
|---|---|
| = 1 | Market Price = Book Value |
| < 1 | Discount — Value Opportunity or Value Trap |
| > 1 | Premium — Quality or Overvaluation |
Formula & Explanation
Visual Guide
Worked Example — Indian Market
P/B Interpretation
P/B 0.8x may look cheap — but if ROE < 8% and debt high, market may be pricing poor capital efficiency. Pair P/B with ROE and asset quality.
Real World Example
Two houses are for sale:
| House A | House B | |
|---|---|---|
| Assets Value | ₹50 lakh | ₹50 lakh |
| Selling Price | ₹50 lakh | ₹1 Cr |
House B is clearly more expensive — you pay ₹1 Cr for ₹50 lakh of assets. In the stock market, P/B Ratio asks:
"How much are you paying to buy ₹1 of Net Assets?"
Case Study
Company A (Value Trap?)
| Metric | Value |
|---|---|
| P/B | 0.7 |
| ROE | 5% |
| Profit Growth | Negative |
| Debt | High |
Not cheap — may be a Problem Company.
Company B (Quality Premium)
| Metric | Value |
|---|---|
| P/B | 4 |
| ROE | 25% |
| Debt | Low |
| Growth | Strong |
May trade at a premium — Market is pricing future Earnings.
ICICI Bank
Do not use P/B alone — combine with ROE, NPA, Loan Growth, CASA Ratio.
PFC
P/B + Asset Quality + Government Exposure + Dividend Yield.
TCS
P/B is less useful — real assets are Talent, Client Relationships, and Brand.
CFA Exam Tip
P/B shows how the Market values Net Assets — it does not show Management Quality, Profit Growth, or Business Quality.
P/B + ROE Framework (Senior Analyst Favorite):
| Company | P/B | ROE | Verdict |
|---|---|---|---|
| A | 1 | 5% | Weak |
| B | 3 | 25% | Often Better |
Golden Rules:
High P/B + High ROE = often justified
Low P/B + Low ROE = often Value Trap
Banking Sector: For Banks, P/B matters more than P/E — business is built on Assets (Loans, Investments, Cash).
Sector Utility:
| Excellent | Less Useful |
|---|---|
| Banks, NBFCs, Insurance, Manufacturing | IT, SaaS, Platform Businesses |
Common Mistakes
- P/B < 1 but Profit declining consistently
- Low P/B but very high Debt
- Book Value not growing
- ROE declining consistently
- Questionable asset quality
Key Takeaways
P/B = Market Price ÷ BVPS. P/B = 1 means fair book value pricing; < 1 may be opportunity or trap; > 1 may reflect quality or overvaluation. Primary valuation tool in the banking sector. Always combine with ROE — High P/B + High ROE often justified; Low P/B + Low ROE often trap. Professional analysts ask: Do ROE and Growth justify this P/B?
Practice Questions
Chapter: P/B Ratio (Price to Book) | Part 03 | Try before reading answers.
Q1 (Conceptual): What is the core message of this chapter in one sentence?
Q2 (Calculate): Calculate: 2,500 Cr = 20% ROE?
Q3 (Application): How do P/B Ratio and BVPS interact in P/B Ratio (Price to Book) decisions?
Q4 (Red Flag): Red flag: P/B < 1 but Profit declining consistently — why avoid relying on P/B Ratio (Price to Book) alone?
Q5 (CFA Style): CFA-style trap when interpreting P/B Ratio (Price to Book)?
Q6 (Decision): Invest / wait / avoid — 3 bullets using P/B Ratio (Price to Book) framework on one stock.
Q7 (Lab): Complete one P/B Ratio (Price to Book) exercise in Part 03 Practice Lab.
Answer Key
Q1 (Conceptual)
P/B = Market Price ÷ BVPS. Always combine with ROE — High P/B + High ROE often justified; Low P/B + Low ROE often trap.
Q2 (Calculate)
20% ROE
Q3 (Application)
Both must align — strong P/B Ratio with weak BVPS (or vice versa) needs deeper AR review.
Q4 (Red Flag)
P/B < 1 but Profit declining consistently
Q5 (CFA Style)
P/B shows how the Market values Net Assets — not Management Quality, Profit Growth, or Business Quality.
Q6 (Decision)
Justify with metric trend + valuation + balance-sheet quality; one ratio never enough.
Q7 (Lab)
See Part 03 Practice Lab and verify with lab Answer Key.
Go deeper: Part 03 Practice Lab
FAQ {#faq}
Q: What should I check alongside P/B Ratio evaluation?
A: Low P/B with very high Debt — triangulate with ROE, cash flow, and asset quality.
Q: How do I connect P/B Ratio theory to Indian market practice?
A: Use Screener/Trendlyne + company annual reports — plot the same metrics over 3 years; paper formulas alone are insufficient.
Q: Why avoid relying on P/B < 1 when Profit is declining?
A: Discount to book with falling earnings often signals a value trap.
Q: Why is stagnant Book Value a red flag when using P/B?
A: Market may be pricing weak capital accumulation — check ROE and reinvestment.
Q: How do I drill this chapter's concepts in the Practice Lab?
A: Open Part 03 Practice Lab → use the FAQ Drill row for price-to-book-ratio to practice on real stocks, then verify answers against the Chapter FAQ Quick Index.
Practice Lab FAQ: Full part FAQ index — Part 03 Practice Lab
Related Topics
- Previous Chapter: 18-Book Value
- Next Chapter: 20-Return On Equity
- Part Overview: Part 03 Fundamental Analysis
- Book Index: Full Table of Contents
Disclaimer: Educational content only. Not investment advice. Consult a qualified financial advisor before investing.