Book Value Per Share Calculator

What book value per share means

Book value per share is what a company's own accounts say a single share is worth. It takes the equity on the balance sheet, the value of everything the company owns once everything it owes has been subtracted, and divides it across every share, giving you the slice of net assets standing behind each one.

Put another way, it is roughly what each share would theoretically be worth if the company closed its doors tomorrow, sold everything at the values in its books, and paid off all its debts, with whatever was left handed to shareholders. That makes it the accountant's answer to what a share is worth, and this calculator works it out from two figures: total equity and shares outstanding.

How it is calculated, and the preferred-stock caveat

The calculation is a simple division: the company's equity divided by the number of shares outstanding. The result is the book value attributable to each share.

There is one refinement worth knowing if a company has issued preferred stock. Strictly, book value per share is meant to measure the value backing the common shares, so the proper figure on top is common equity, that is, total equity with any preferred stock taken out first. This is because preferred shareholders stand ahead of common shareholders if a company is wound up, so their claim is subtracted before working out what belongs to the ordinary shareholders. For the many companies that have no preferred stock at all, total equity and common equity are one and the same, and you can enter total equity directly. But if preferred stock is in the mix, subtract it first so the number reflects what genuinely stands behind a common share.

A worked example

Say a company has total equity of 50,000,000 and 10,000,000 shares outstanding.

Divide the equity by the shares and the book value per share is $5.00. So according to the company's books, each share is backed by 5 of net assets. That is a clear, concrete figure, but it only becomes interesting when you hold it up against a very different number: what the share actually trades for in the market. That comparison is where the real insight lies, and it is the subject of the next section.

Book value against market price

Book value per share and market price are two answers to the same question, and they are almost never the same. Book value is what the accounts say a share is worth; market price is what investors are actually willing to pay for it. The relationship between them is captured in the price-to-book ratio, the market price divided by the book value per share, and that ratio is genuinely revealing.

Take our company with a book value of 5 a share. If its shares trade at 15, its price-to-book ratio is 3: the market values each share at three times the net assets recorded behind it. If instead the shares traded at 4, the ratio would be 0.8, and the market would be valuing the company below its own accounting net worth. A ratio above 1 means investors are paying a premium to book value, usually because they expect the company to earn far more than its balance sheet alone would suggest. A ratio below 1 means the market is pricing the shares beneath their net assets, which can point either to a genuine bargain or to a company the market fears is in trouble. Reading the two figures together tells you far more than either does alone, which is why our price to book ratio calculator is the natural next step from this one.

Why the two pull apart

It is worth understanding why book value and market price diverge so often, because the reasons expose exactly where book value is useful and where it misleads. Two accounting realities drive most of the gap.

The first is that book value rests on historical cost. Assets sit on the balance sheet at what the company paid for them, less depreciation, not at what they are worth today, so a building bought decades ago or appreciating land can be carried far below its real value. The second, and larger, is that book value barely captures intangibles. A company's brand, its patents, its software, the skill of its people, none of these appear at their true worth on the balance sheet, yet for many modern businesses they are where nearly all the value lies. That is why an asset-light technology company can trade at many times its book value, its worth is mostly in things the accounts never recorded, and why book value per share is far more meaningful for asset-heavy businesses like banks, insurers, and industrial firms, whose worth really does sit in tangible assets on the balance sheet. Knowing which kind of business you are looking at is the difference between reading this number well and being misled by it.

How investors use it

For all its limits, book value per share earns its keep, especially among investors of a cautious, value-minded bent. It offers a conservative, tangible floor for a company's worth, grounded in real net assets rather than in the optimism baked into a share price, which is why it has long been a staple of value investing.

Investors put it to work in a few ways. They use it as the anchor for the price-to-book ratio to hunt for shares trading below their net asset value, a tactic that works best in the asset-heavy sectors where book value is reliable, banking above all. And they watch book value per share grow over time, since a company steadily building the net assets behind each share is, in a real sense, creating value for its owners, even when the share price is bouncing around for other reasons. Used alongside earnings and cash flow rather than on its own, it adds a grounding that market-based numbers lack, so our earnings per share calculator makes a natural companion to round out the picture.

Questions people ask

What is book value per share?

It is the per-share accounting value of a company, equal to its common equity divided by its shares outstanding. It represents the net assets backing each share, roughly what a share would be worth if the company were liquidated at the values recorded in its books.

Should I subtract preferred stock?

Yes, if the company has any. Book value per share measures the value behind common shares, so preferred stock should be taken out of equity first, because preferred shareholders rank ahead of common ones. If there is no preferred stock, total equity and common equity are the same.

Why is it different from the share price?

Book value comes from the accounts and is based on historical cost, and it largely ignores intangibles like brand and intellectual property. Market price reflects what investors will pay, including their expectations of future growth. So the two often differ, sometimes greatly, and the price-to-book ratio measures the gap.

Is a higher book value per share better?

A rising book value per share over time generally signals a company building net assets behind each share, which is a good sign. But the figure is most meaningful for asset-heavy businesses; for intangible-heavy firms it understates worth, so it should always be read alongside other measures rather than on its own.

References

The book value per share formula, the exclusion of preferred stock, the comparison with market price through the price-to-book ratio, and the limitations from historical cost and intangibles follow the Corporate Finance Institute and the value-investing tradition set out by Graham below.

1. Corporate Finance Institute. Book Value Per Share (BVPS). corporatefinanceinstitute.com
2. Graham, B. The Intelligent Investor (book value, price-to-book, and margin of safety). Harper.