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Price-to-Book (P/B) Ratio Calculator
Price-to-Book (P/B) Ratio Calculator
Price-to-Book Ratio
1.80×
Valuation Analysis
The stock trades at 1.80× book value ($25.00 per share), roughly below the 3× sector average. Its $5,400,000,000 market capitalization prices the equity at 1.80 times its accounting value.
*Book value is an accounting figure based on historical cost minus depreciation and may not reflect current market value of assets. Intangible-heavy and technology companies often trade far above book value. This tool is educational and is not investment advice.
What Is the Price-to-Book Ratio?
The price-to-book ratio compares a company's market value to the accounting value of its equity. It tells you how many dollars investors pay for every dollar of net assets on the balance sheet. A stock at $45 with $30 of book value per share trades at 1.5× book. It is one of the oldest valuation metrics in investing — Benjamin Graham built his classic value framework around the relationship between price and the tangible assets behind each share. P/B shines for asset-heavy businesses like banks, insurers, real estate, and industrials, where the balance sheet actually represents value. It misleads badly for asset-light technology and service companies whose real assets are brands, patents, and software that accounting rules keep largely off the balance sheet. The S&P 500 trades around 4-5× book overall, while banks hover near 1-1.5× and large tech companies exceed 10×. Value screens still use P/B as a primary metric — the classic 'Graham number' of 1.5× book remains a popular deep-value benchmark. This calculator computes book value per share, the P/B multiple, and how your target's multiple compares against its sector.
Computing Book Value and the Multiple
Book value per share equals total shareholders' equity divided by shares outstanding. Shareholders' equity is total assets minus total liabilities — effectively what accountants say would be left for owners if the company liquidated at recorded values. A company with $3 billion of equity and 120 million shares has book value of $25 per share; at a $45 price, it trades at 1.8× book. The multiple itself is simply Share Price ÷ Book Value per Share. A useful derived figure is the implied fair value: Book Value per Share × Sector Average P/B shows what the stock would be worth if the market paid the sector's typical multiple for its assets. There is also an important identity linking P/B to profitability: P/B = Return on Equity × P/E. High-ROE businesses deserve higher book multiples, which is why a bank earning 12% on equity trades above one earning 6%. Check ROE alongside P/B whenever you use this ratio — cheap book with weak returns is often cheap for a reason.
Expert Insights
P/B Below 1 Is a Signal, Not a Verdict
A stock trading below book value is either a bargain or a business with impaired assets. Banks dip under 1.0× in crises because markets doubt loan-book quality. Check the reason: if assets are solid and returns adequate, sub-1.0× offers a genuine margin of safety; if losses are eroding book value each quarter, the discount is earned.
Buybacks Change the Ratio Over Time
Heavy share repurchases reduce shares outstanding and book equity simultaneously, mechanically raising book value per share and often the P/B multiple. Companies like McDonald's run such negative or thin equity from buybacks that P/B becomes meaningless. Verify the trend in equity and shares before anchoring on any book multiple.
Sector Comparisons Beat Market Comparisons
Judging a software company's 12× book against the market's 4.5× is meaningless — its assets are not on the balance sheet. Judge it against software peers. Within a single sector, P/B becomes genuinely comparable because accounting treatment and asset intensity are similar. Use the sector input to keep your anchor honest.
Actionable Tips
- 1
Pair P/B With Return on Equity
Calculate ROE = Net Income ÷ Shareholders' Equity for any P/B candidate. A stock at 1.2× book earning 15% on equity is far more attractive than one at 0.9× book earning 4%. High returns justify higher book multiples over time, and the combination separates genuine value from value traps.
- 2
Use Tangible Book for Banks and Financials
For financial companies, subtract preferred stock and intangibles from equity to get tangible book value per share — the more conservative measure analysts prefer. During financial stress, tangible book is the metric regulators and acquirers use, so compare your P/B calculation against that standard.
- 3
Check the Five-Year Book Value Trend
Rising book value per share means the company is compounding its capital base. Stagnant or falling book — common in declining industries — means you may be paying for assets that are shrinking. Free screeners show five-year book trends; prefer companies that grow book value and trade near average multiples.
Real-World Examples
Victor Banked on a Post-Crisis Rebound
After a regional banking scare, Victor found a well-capitalized bank trading at 0.9× tangible book versus a 1.3× sector average. Its loan losses were contained and it earned 10% on equity. He bought at $32. Two years later, as sentiment normalized, the multiple returned to 1.3× book and the stock reached $51 — a 59% gain driven almost entirely by the multiple re-rating.
Sandra Passed on the Too-Cheap Retailer
A department store chain traded at 0.7× book, which looked like deep value. Sandra ran this calculator and then checked the balance sheet: stores carried on the books at decades-old cost basis, and inventory was going stale. The 'cheap' book value was inflated. She passed, and the stock lost another 40% as book itself was written down.
Devin Learned Where P/B Fails
Devin screened for low-P/B stocks and bought a software firm at 2× book, cheap versus the 8× sector average. The company was profitable but its equity base was minuscule relative to its earnings power, so any share issuance or buyback whiplash moved the ratio wildly. The stock fell anyway when growth slowed. He now uses P/B only for asset-heavy sectors and P/E for everything else.
Glossary of Terms
- Book Value per Share
- Total shareholders' equity divided by shares outstanding; the accounting net asset value behind each share.
- Price-to-Book Ratio
- Share price divided by book value per share. Measures how much the market pays for each dollar of accounting equity.
- Tangible Book Value
- Book value excluding intangible assets like goodwill and trademarks; the conservative measure preferred for banks and financial companies.
Frequently Asked Questions
Everything you need to know about this topic.
Ivy Sinclair-Wren
Financial Chaos Analyst
Ivy Sinclair-Wren is a Financial Chaos Analyst covering investing, AI, wealth psychology, and the emotional consequences of opening finance apps during market crashes. Based in Melbourne, she specializes in demystifying the US tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.