What it means
For a single asset, book value is its original cost minus the depreciation (the gradual write-off of its cost) built up so far. A delivery van bought for $40,000 and depreciated by $25,000 has a book value of $15,000.
This figure appears on the balance sheet. For a company as a whole, book value is what would be left for shareholders if every asset were sold at its recorded value and every debt paid.
It is also called net asset value or shareholders' equity. Dividing it by the number of shares gives book value per share.
Investors compare book value with the share price using the price-to-book ratio. A ratio below 1 can suggest the market values the company at less than its accounts show, while a high ratio suggests the market expects strong future earnings.
Neither reading is automatic, because the quality of the assets matters. Book value has clear limits.
It records assets mostly at historical cost, so land bought decades ago may be worth far more than its book value. Things like brand, software and customer relationships are often missing, which understates technology and service firms.
The measure works best for asset-heavy businesses such as banks, insurers and property companies. For these firms, the balance sheet is close to the true economic story.
It works less well for businesses whose value rests on ideas and people. Managers also use book value in practice.
It sets the starting point for calculating a gain or loss when an asset is sold, and it appears in loan agreements that test net worth. Understanding it avoids confusion with market value.
In practice
Real-world examples
Example 1
A logistics company bought a lorry for $120,000 and has charged $90,000 of depreciation. Its book value is $30,000. When the lorry is sold for $35,000, the company records a gain of $5,000. The gain is simply the sale price of $35,000 less the book value of $30,000.
Example 2
An investor screening bank shares finds one trading at 0.8 times book value. She investigates and finds that the bank has a high level of troubled loans, which explains the discount. The low ratio is a warning, not a bargain. She moves on to a bank with cleaner loans.
Example 3
A software start-up has a book value of $400,000 but is valued at $20,000,000 by investors. Its main assets, the code and customer base, are not recorded on the balance sheet. The gap reflects value that book value cannot capture. An investor would be wrong to call the shares overpriced on that basis alone.
Think of it
Book value is like the value of your car according to the Blue Book-it's an accounting estimate that may differ from what someone would actually pay for it.
Formula
Calculation
Book value of a company = Total assets - Total liabilities
Book value per share = Book value / Number of shares outstanding
Suppose a company has total assets of $5,000,000 and total liabilities of $3,200,000. Book value = 5,000,000 - 3,200,000 = $1,800,000.
With 100,000 shares outstanding, book value per share = 1,800,000 / 100,000 = $18.
If the shares trade at $27, the price-to-book ratio is 27 / 18 = 1.5.Case study
Seen in the real world
Stonehaven Property Group is a fictional company that owns office buildings bought many years ago. The accounts show a book value of $60,000,000, while an independent valuer estimates the buildings are worth much more. The share price trades close to the book value.
An investor notices the gap and builds a case that the shares are undervalued. This illustrative story shows both sides of book value: it gave a clear, auditable starting point, but the historical cost basis hid the true worth of the property. The investor adjusted the figure with current valuations before deciding.
The adjusted number was about 40% higher than the reported book value, which made the shares look much more reasonably priced. Even so, the investor kept a margin of safety, since valuations are estimates. The exercise showed that book value is a starting point for analysis, not the end of it.
Watch out
Common mistakes
- Assuming book value is what the business is worth. Market value reflects future earnings and can be far higher or lower.
- Forgetting that book value ignores most internally built intangibles. Brands and software developed in-house often do not appear on the balance sheet, which can make asset-light firms look cheap or expensive by mistake.
- Treating a low price-to-book ratio as a sure bargain. The market may be pricing in poor asset quality.
Questions
People also ask
How is book value different from market value?
Book value comes from the accounts at recorded cost, while market value is what buyers will pay today.
Can book value be negative?
Yes, if liabilities exceed assets, which signals financial strain or heavy past losses. Some healthy companies also show it after large share buybacks, so the cause matters.
Is book value the same as equity?
For a whole company, yes, since total assets minus total liabilities equals shareholders' equity. For a single asset, book value is simply its cost less accumulated depreciation.
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