First, find the net value of all fixed assets on the company's balance sheet. You'll see this value listed as property, plant, and equipment (PP&E). To this number, add the value of all capital investments and current assets. From this number, subtract all current liabilities. These include all financial obligations due in a year or less. Examples of current liabilities listed on a company's balance sheet include accounts payable, short-term debt, and dividends payable.