The calculation of its book value per share is. Here is the formula. By using the Book Value per Share Formula.
The equity is the total number of assets after liabilities are subtracted.
Here is the formula. So you have to deduct the total shareholder equity with preferred shares. Also since youre working with common shares you must subtract the preferred shareholder equity from the total equity. While this is usually found on a balance sheet it is helpful to know how to retrieve this value yourself.