Price-to-Book Ratio (P/B) Calculator🇦🇷
The P/B (Price-to-Book) ratio compares the market price with the book value (shareholders' equity) per share. A P/B < 1 means the stock trades below its book value. Essential for valuing banks, insurance companies, and asset-heavy businesses.
When to use this calculator
- Value bank and insurance stocks.
- Find stocks trading below book value.
- Compare P/B ratios across sector peers.
- Complement analysis with P/E and other ratios.
- Analyze stocks by shareholder equity value.
Real Example: Bank Stock at $50
- Given: stock price = $50, shareholders' equity = $5B, shares outstanding = 100M, sector avg P/B = 1.5.
- Book Value Per Share: $5B / 100M = $50.
- P/B Ratio: $50 / $50 = 1.0.
- Fair Value by Sector: $50 × 1.5 = $75.
- Valuation: trading 33% below sector average — potential undervaluation opportunity.
How it works
1 min readWhat Is the P/B Ratio?
The P/B (Price-to-Book) ratio compares the market price to the book value (shareholders' equity) per share. A P/B = 1 means the market is paying exactly the book value. Below 1 suggests undervaluation (or financial distress); above 3 often signals overvaluation in traditional sectors, but is normal for tech stocks.
Typical P/B Ranges by Industry
| Sector | Average P/B |
|---|---|
| Banks | 0.8 – 1.5 |
| Insurance | 1.0 – 1.8 |
| Utilities | 1.2 – 2.0 |
| Industrial | 1.8 – 3.0 |
| Consumer | 3.0 – 5.0 |
| Technology | 4.0 – 10.0 |
| Software | 6.0 – 20.0 |
Formula
Book Value Per Share = Shareholders' Equity / Shares Outstanding
P/B Ratio = Stock Price / Book Value Per Share
When to Use & Common Mistakes
Frequently asked questions
What is a good P/B ratio?
It depends on industry. Banks typically trade at 1.0–1.5x book value, utilities at 1.2–2.0x, while tech companies often trade at 5–15x. A P/B below 1.0 may indicate undervaluation or financial distress.
How is P/B ratio different from P/E ratio?
P/B compares stock price to book value (assets minus liabilities), while P/E compares price to earnings. P/B works best for asset-heavy businesses like banks; P/E is better for profitable service companies.
Is a low P/B always a buying opportunity?
Not necessarily. A P/B below 1.0 can signal undervaluation, but it may also mean assets are worth less than shown, earnings are declining, or the market expects future losses.
Which types of stocks is P/B most useful for?
P/B works best for banks, insurance companies, real estate (REITs), utilities, and industrial companies. It's less useful for tech, software, and service companies where intangible assets drive value.
Where do I find shareholders' equity and shares outstanding?
Both are on a company's balance sheet in quarterly (10-Q) or annual (10-K) filings on the SEC's EDGAR database, or on financial sites like Yahoo Finance, Seeking Alpha, or your brokerage.
Does inflation affect book value in P/B calculations?
In high-inflation environments, historical cost book values can be distorted. Some analysts adjust book value for inflation to get a more realistic picture of asset values.
What is tangible book value?
Tangible book value excludes intangible assets like goodwill and patents. It's more conservative than regular book value. Banks often report both to show hard assets backing shareholder equity.
Can I use P/B for penny stocks?
Yes, but be cautious. Many micro-cap stocks have unreliable data, inflated assets, or negative book value. Always verify the data independently before investing.
How does P/B work for ADRs and international stocks?
The P/B ratio works the same globally. For ADRs, use the underlying company's equity and share count in its home currency; the ratio remains constant regardless of ADR conversion.