Gross Profit Margin: A measure that gives the percentage of revenue left above the COGS, thus the firm's efficiency in producing. It is calculated as Gross Profit/Revenue * 100.Gross Profit Margin: A measure that gives the percentage of revenue left above the COGS, thus the firm's efficiency in producing. It is calculated as Gross Profit/Revenue * 100.Gross Profit Margin: A measure that gives the percentage of revenue left above the COGS, thus the firm's efficiency in producing. It is calculated as Gross Profit/Revenue * 100.