How to Calculate Outstanding Shares of Stock

Determine the par value of the share. The par value of the share is listed under stockholders' equity on the balance sheet. For example, Ricky Rat Corporation has a par value of $4 per common share.
Determine the value of the listed share on the balance sheet. This is a number listed under each year. Determine the year you want to calculate and look at the corresponding line underneath the year on the balance sheet. For example, Ricky Rat Corporation's common share is listed as $20,000 on their balance sheet.
Divide the listed share's value by the par value of the share to find the number of shares outstanding. For example divide $20,000/$4 = 5,000 shares.