Book Value Per Share Calculator
Last updated: 27 June 2026
Reviewed by Gavin Meiring, Lead research and primary author · Doctoral Candidate (Corporate Governance) · Research and drafting assisted by AI
- Book value is simply what's left of a company's balance sheet after subtracting liabilities from assets — and the 'book' refers to the accounting ledgers where the figures are recorded.
- A company's book value rarely equals what it's worth: intangibles like brand and know-how aren't on the balance sheet, which is why healthy companies usually trade far above book value.
- Berkshire Hathaway, run by Warren Buffett, has grown its book value per share at roughly 20% a year since the mid-1960s — a record Buffett himself has long used as his own yardstick for the company.
Book Value Per Share Calculator
A book value per share calculator divides a company's total shareholders' equity by the number of shares outstanding to give the accounting value per share. It is used by investors screening for undervalued stocks, analysts benchmarking companies within an industry, and anyone comparing market price to the underlying balance sheet value of a business.
How to Use the Book Value Per Share Calculator
- Find the total shareholders' equity from the company's balance sheet (total assets minus total liabilities).
- If the company has preferred shares, subtract the preferred equity value.
- Enter the number of common shares outstanding.
- Click calculate to see the book value per share.
The Formula
Book Value Per Share (BVPS) = (Total Shareholders' Equity - Preferred Equity) / Common Shares Outstanding
Total Shareholders' Equity = Total Assets - Total Liabilities
The price-to-book ratio (P/B ratio), often used alongside BVPS:
P/B Ratio = Market Price Per Share / Book Value Per Share
A P/B ratio below 1 means the market is pricing the company below its net asset value, which may indicate undervaluation or reflect concerns about asset quality and future earnings.
Real-World Example
A manufacturing company reports the following on its balance sheet:
- Total assets: £500 million
- Total liabilities: £320 million
- Preferred equity: £20 million
- Common shares outstanding: 40 million
Total shareholders' equity: £500m - £320m = £180 million Less preferred equity: £180m - £20m = £160 million available to common shareholders
BVPS = £160 million / 40 million shares = £4.00 per share
If the stock is currently trading at £3.20, the P/B ratio is 3.20 / 4.00 = 0.80. The stock trades at a 20% discount to book value, which may warrant further investigation into why the market applies this discount.
Book Value Versus Market Value
Book value is an accounting concept based on historical cost; market value is the price investors are willing to pay today based on future earnings expectations. The two diverge for several reasons. A company with strong brand value, patents, or customer relationships will carry intangible assets worth far more than their recorded book value (or nothing at all, if internally generated rather than acquired). Technology companies often trade at very high P/B multiples because their value lies in earnings power rather than tangible assets. Conversely, banks and financial companies often trade closer to book value because their primary assets are financial instruments carried at or near market value. Book value is most meaningful for asset-intensive industries: utilities, property companies, banks, and industrial manufacturers where tangible assets represent a large share of value. For technology, software, and service companies, book value is a less useful valuation anchor.
Frequently Asked Questions
What is tangible book value per share? Tangible book value strips out intangible assets (goodwill, patents, trademarks, and similar) from the equity calculation. It is considered a more conservative measure because intangibles can be difficult to value and may not be recoverable in a liquidation. Tangible BVPS = (Shareholders' Equity - Preferred Equity - Intangible Assets) / Common Shares Outstanding. For companies that have made many acquisitions, the difference between book value and tangible book value can be substantial.
How does share buybacks affect book value per share? Share buybacks reduce the number of shares outstanding without necessarily changing total equity proportionally. If a company buys back shares at a price above book value, total equity falls by more than the proportional reduction in shares, which can actually reduce BVPS. If shares are bought back at below book value, BVPS increases. Many companies choose to buy back shares when they believe the market price is below intrinsic value, in which case the buyback is accretive to remaining shareholders.
Can book value per share be negative? Yes. If total liabilities exceed total assets, shareholders' equity is negative, resulting in a negative BVPS. This can occur in highly geared companies or those that have sustained large losses. A negative book value does not necessarily mean the company is worthless (it may still have strong cash flows), but it means the balance sheet shows net liabilities. P/B ratios are not meaningful for companies with negative book value.
How often does book value change? Book value changes every time a company reports earnings (profits increase retained earnings, losses decrease them), issues or buys back shares, pays dividends (which reduce retained earnings), or revalues assets. It is reported quarterly in most public companies' balance sheets. Analysts typically use the most recent quarterly figure, though some use a trailing 12-month average to smooth out fluctuations.
The balance sheet behind the example
Every line the formula uses comes off one statement, so it helps to see the example built up in order.
| Line | Amount |
|---|---|
| Total assets | £500.0m |
| Total liabilities | £320.0m |
| Total shareholders' equity | £180.0m |
| Less preferred equity | £20.0m |
| Equity available to common shareholders | £160.0m |
| Common shares outstanding | 40.0m |
| Book value per share | £4.00 |
Two subtractions stand between the balance sheet total and the per-share figure. The first strips the liabilities to leave equity. The second strips the preferred claim, because preferred shareholders rank ahead of common shareholders and hold a separate claim on the same pool. Dividing what is left by the common share count gives the number that belongs to each common share.
What the market pays at each price to book multiple
With book value fixed at £4.00, each multiple maps to one share price. The company trades at £3.20, which is 0.80.
| Price to book | Share price |
|---|---|
| 0.50 | £2.00 |
| 0.60 | £2.40 |
| 0.80 | £3.20 |
| 1.00 | £4.00 |
| 1.20 | £4.80 |
| 1.50 | £6.00 |
| 2.00 | £8.00 |
| 3.00 | £12.00 |
Read downwards, the table shows what a buyer pays for each pound of recorded net assets. Below 1.00 a buyer pays less than the accounting value. Above 1.00 a buyer pays a premium, which the market justifies with future earnings rather than with the assets on the statement.
Tangible book value for the same company
Goodwill and other acquired intangibles sit inside the £160m. Strip them out and the figure changes, sometimes across the 1.00 line.
| Intangible assets | Tangible equity | Tangible book value per share | Price to tangible book at £3.20 |
|---|---|---|---|
| £25m | £135m | £3.375 | 0.95 |
| £35m | £125m | £3.125 | 1.02 |
| £60m | £100m | £2.500 | 1.28 |
At £35m of intangibles the multiple crosses 1.00, and the share that looked cheap against book value looks fully priced against tangible book value. That is why the two figures are quoted side by side. A company built by acquisition carries a large goodwill balance, and the gap between the two measures can be wide.
What a buyback does to book value per share
Buybacks cut the share count and the equity pool at the same time, so the effect on the per-share figure depends on the price paid.
| Price paid | Shares bought | Equity after | Shares after | Book value per share |
|---|---|---|---|---|
| £3.20 | 2.0m | £153.60m | 38.0m | £4.0421 |
| £5.00 | 2.0m | £150.00m | 38.0m | £3.9474 |
| £3.20 | 5.0m | £144.00m | 35.0m | £4.1143 |
Buying at £3.20, which sits below the £4.00 book value, lifts the figure to £4.0421. Paying £5.00, which sits above it, cuts the figure to £3.9474. The mechanism is arithmetic: cash leaves the equity pool at the price paid, and the remaining shares absorb the difference. Buybacks below book value transfer value to the shareholders who stay.
Reading the figure and what it omits
The formula uses common shares outstanding, so it excludes preferred equity and it excludes any non-controlling interest in subsidiaries. IAS 1 requires a statement of financial position to present capital and reserves attributable to owners of the parent separately from non-controlling interests, and the per-share figure is built on the parent line, because a minority stake in a subsidiary does not belong to the parent's shareholders.
Book value is a residual measured at historical cost. It says nothing about the earning power of the assets, and it counts only what the company has recorded. Internally generated brands, a trained workforce, customer relationships and research pipelines appear in it only when another company paid for them in an acquisition. For an asset-heavy business the figure anchors a valuation; for a software or services business it anchors very little.
A note on the presentation standard
The separation of equity attributable to owners of the parent from non-controlling interests comes from IAS 1, Presentation of Financial Statements, which sets out the minimum line items for the statement of financial position and the statement of changes in equity. US companies reporting under ASC 210 present the same distinction under different wording, so a figure lifted from a US filing and a figure lifted from an IFRS filing are built to the same logic even where the labels differ.
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