The gross profit margin ratio, also known as gross margin, is the ratio of gross margin expressed as a percentage of sales. Gross margin, alone, indicates how much profit a company makes after paying off its Cost of Goods sold. It is a measure of the efficiency of a company using its raw materials and labor during the production process. The value of gross profit margin varies from company and industry. The higher the profit margin, the more efficient a company is. Gross profit margin can be assigned to single products or an entire company.