Profit Margin looks at how much of Sales revenue remains as profit after all costs and expenses are paid.
Ratio: Gross Profit as a percentage of Sales
Calculation: Operating Income as a percentage of Sales
Profitability or Return on Sales(ROS)
Calculation: Net Income as a percentage of Sales
People will think of profit margins at different points on the Income Statement. Production might look at Gross Margin while operations might look at Operating Margin; the Finance Department looks at Return on Sales.
We use ‘margin’ to denote a percentage (of Sales). Some people use ‘margin’ to mean the same as Contribution. Other people use it to mean the same as Gross Profit.