Net Profit Margin (also referred to as return on sales or net income margin) measures how much profit a company makes for each dollar in revenue. While the net profit will give us the actual amount of money earned, the net profit margin gives us a percentage. This in turn provides us with a measure we can now use to compare companies or business units.
Net profit margin is an important indicator measuring how efficient a company (or business unit) is and how well it is able to control its costs.
Net Profit Margin = (Net Profit / Revenues) x 100