Gross income divided by net sales, expressed as a percentage. Gross margins reveal how much a company earns taking into consideration the costs that it incurs for producing its products and/or services. In other words, gross margin is equal to gross income divided by net sales, and is expressed as a percentage. Gross margin is a good indication of how profitable a company is at the most fundamental level. Companies with higher gross margins will have more money left over to spend on other business operations, such as research and development or marketing.For more information, see Gross vs Net.