Net Profit Margin is a measure of profitability that reveals how much of each dollar earned by a company is turned into net income. This measure shows how well a company is managing expenses and provides insight into a company’s ability to generate a return on investment. It allows investors to compare the relative profitability between companies in the same industry and to compare the historical performance of a company.

Net Profit Margin can be calculated by dividing net income (after all expenses have been accounted for) by total revenue. The result is expressed as a percentage. For example, a company’s net income is $6 million, and its total revenue is $20 million. The Net Profit Margin for this company is 30%, meaning that the company earns 30 cents for every dollar of revenue that it receives.

The higher the net profit margin, the better the company is doing in generating a return on investment. Excellent margins are ones that exceed 15%. A company’s net profit margin in comparison to its industry peers can give investors insight into where the company is performing well and can help warn of potential areas for improvement.

Net Profit Margin is an important metric for businesses to monitor, as it shows how well a company is converting its sales into net income. It is an important indicator that drives investment decisions and can be used to assess a company's financial health. Higher net profit margins indicate better profitability and improved return on investments. Lower margins, on the other hand, can be a warning sign of inefficiencies and competitive pressures. As such, investors should look out for significant changes to a company’s net profit margin as it can be an indication of how well the company is doing at managing its costs and driving revenues.