What Is the Price to Book Ratio?
Every stock has a price - but prices can be misleading.
Supply and demand, number of shares, sentiment, and more, all can influence what a company’s share price will be.
But whether a stock is $50 or $500, how do you know you’re getting a good deal?
Investors use valuation metrics to help determine if the stock they want to buy is reasonably priced or not.
One of those metrics is price-to-book ratio or P/B.
The price to book ratio (P/B ratio) tells you how much you're paying relative to a company's actual net worth - what the company owns minus what it owes.
In English: This number shows you what you will pay for every $1 a company has in assets.
That matters, because as an investor, you want to know how much of those assets you are entitled to.
This is called shareholder equity - and this metric is especially useful for value investors because it compares market perception to accounting reality.
When you buy a stock, the P/B ratio shows whether you're paying more or less than the company's tangible assets are worth.
All types of investors can use this ratio to help determine if a stock is overvalued or undervalued.
Let’s break down how to calculate the price-to-book ratio with real examples, when investors should use it, and more.
Keep in mind: P/B ratio is just one way investors can value a stock - but there are others.
Our market analysts use this metric and more when identifying specific potential investing opportunities in our weekly investing report, Market Briefs Pro.
You can learn more about these potential investing opportunities by subscribing to Market Briefs Pro.
How to Calculate Price to Book Ratio
The formula is straightforward:
P/B Ratio = Stock Price ÷ Book Value Per Share
In order to find book value per share, here’s what you’ll need:
Book Value Per Share = Total Shareholder Equity ÷ Shares Outstanding
Let's walk through a real calculation using Pfizer as an example.
Note: All numbers are from Q2 2025.
Step-by-Step: Calculating Pfizer's P/B Ratio
Step 1: Find the stock price
Pfizer trades at $23.32 per share (as of May 23, 2025).
Step 2: Find total shareholder equity
From Pfizer's balance sheet: Total shareholders' equity = $88.2 billion
Step 3: Find shares outstanding
From Pfizer's 10-K: 5.67 billion shares
Step 4: Calculate book value per share
$88.2 billion ÷ 5.67 billion = $15.55 per share
Step 5: Calculate P/B ratio
$23.32 ÷ $15.55 = 1.49
Pfizer's P/B ratio of 1.49 means investors are paying $1.49 for every $1.00 of net assets Pfizer owns.
What Does the P/B Ratio Tell You?
The P/B ratio reveals how the market values a company compared to its accounting value:
P/B Below 1.0 - Potentially Undervalued
You're paying less than book value. This could be a bargain opportunity, or it could signal that the market believes the company's assets are worth less than stated, or that the business is in decline.
P/B Equal to 1.0 - Fairly Valued
You're paying what the company's net assets are worth according to the balance sheet - this is not an exact science, meaning prices can change rapidly for several reasons.
P/B Above 1.0 - Premium Pricing
You're paying more than book value. This isn't necessarily bad - it often means the market is pricing in intangible value like brand strength, intellectual property, growth prospects, or competitive advantages that don't appear on the balance sheet.
Pfizer's moderate P/B of 1.49 suggests the market sees value beyond physical assets - things like drug pipeline, patents, brand recognition, and R&D capabilities.
Some tech companies have P/B ratios of 10, 20, or even higher because their value is almost entirely intangible.
When to Use the Price to Book Ratio
The P/B ratio works best for asset-heavy companies where tangible assets drive value:
- Banks and financial institutions (lots of assets on the balance sheet).
- Insurance companies (hold significant reserves).
- Manufacturing companies (own plants, equipment, inventory).
- Real estate companies (property is their core asset).
The P/B ratio is less useful for:
- Technology companies (value is in software and intellectual property).
- Service businesses (few tangible assets).
- Companies with negative equity (the ratio becomes meaningless).
For companies without significant tangible assets, consider alternative metrics like EV/EBITDA or price-to-sales ratio instead.
Comparing P/B Ratios: Microsoft vs. Apple
Let's compare two tech giants to see P/B analysis in action.
Note: Numbers are from Q2 2025.
Microsoft
- Total assets: $512 billion
- Total liabilities: $243 billion
- Book value: $269 billion
- Market cap: Higher than book value
Apple
- Total assets: $364 billion
- Total liabilities: $308 billion
- Book value: $56 billion
- Market cap: Higher than book value
Both companies have book values below their market caps, which could imply overvaluation by traditional standards. However, this doesn't tell the full story.
Tech companies like Microsoft and Apple derive most of their value from intangible assets — software, brand equity, customer loyalty, and intellectual property.
These don't show up on the balance sheet but represent real economic value.
This is why you need comprehensive analysis. Never rely on a single valuation metric in isolation.
P/B Ratio Benchmarks by Industry
Different industries have different normal P/B ranges (as of 2025):
| Industry | Typical P/B Range | Why |
| Banks | 0.8 - 1.5 | Asset-driven business model |
| Manufacturing | 1.0 - 3.0 | Significant physical assets |
| Technology | 3.0 - 20.0+ | Intangible assets dominate |
| Retail | 2.0 - 5.0 | Mix of inventory and brand value |
Always compare a company's P/B ratio to its industry peers, not to companies in completely different sectors.
What Is a Good Price to Book Ratio?
There's no universal "good" P/B ratio - context matters.
For value investing, some investors look for P/B ratios under 1.0 as potential opportunities.
In the 1980s, famous investor Carl Icahn targeted undervalued stocks by finding companies with book values higher than their market cap.
He purchased TWA Airlines using this ratio.
Icahn used book value analysis to buy a controlling stake, took it private, and extracted value by selling off parts of the business. The strategy proved extremely profitable.
However, a low P/B ratio alone doesn't guarantee a good investment. You need to understand why the ratio is low:
- Is the company genuinely undervalued?
- Are the assets truly worth their stated value?
- Is the business in decline?
- Are there hidden liabilities not fully reflected in the numbers?
P/B Ratio Limitations
The price-to-book ratio has important limitations:
1. Accounting vs. Market Value
Book value uses historical cost accounting. A building purchased 20 years ago appears at its original cost (minus depreciation), even if it's worth much more today.
Market value often differs significantly from book value.
2. Doesn't Capture Intangible Assets
Patents, trademarks, brand value, customer relationships, and proprietary technology don't show up in book value. For many modern companies, these intangibles represent most of their true worth.
3. Industry Differences
A P/B of 3.0 might be cheap for a software company but expensive for a bank. Always compare within the same industry.
4. Can Be Manipulated
Companies can influence book value through accounting choices, asset revaluations, or share buybacks.
That’s why utilizing more than one valuation metric is key in understanding what the true value of a stock may be.
Using P/B Ratio with Other Metrics
Smart investors never rely on a single metric. The P/B ratio works best when combined with:
- P/E ratio (price-to-earnings) — measures what you pay for profits
- P/S ratio (price-to-sales) — useful for unprofitable companies
- EV/EBITDA — enterprise value to earnings before interest, taxes, depreciation, and amortization
- PEG ratio — adjusts P/E for growth rate
Each metric reveals different aspects of valuation. Together, they give you a complete picture.
Price To Book Ratio: Key Takeaways
The price-to-book ratio is a powerful tool for value investors, especially when analyzing asset-heavy companies.
It compares market price to accounting value, helping identify potential opportunities - and it shows you if you’re over paying or underpaying for a company’s assets.
Remember these essentials:
- Calculate P/B by dividing stock price by book value per share.
- P/B below 1.0 may indicate undervaluation (or problems).
- P/B above 1.0 may reflect intangible value or overvaluation.
- Works best for banks, manufacturers, and other asset-heavy businesses.
- Always use alongside other valuation metrics.
- Compare within the same industry.
The P/B ratio isn't perfect, but it's one important piece of the valuation puzzle.
Some investors love price to book ratio, while others never use it.
This is just one way to value a company, not the only way, so investors should understand other valuation methods and forms of research in order to fully understand a stock's value.
Before you go: Check out Market Briefs Pro to learn more about specific stocks our market analysts believe have the potential to outperform the market this year.
We’ll give you the actual data and research you need to make an informed decision as an investor, which gives you an edge on the rest of Wall Street.
