Gross margin represents the percent of total sales revenue that the company retains after incurring the direct costs associated with producing the goods and services it sells. It is calculated as: Gross Margin = (Total Revenue - Cost of Goods Sold) / Total Revenue × 100.
For example, if a company sells $10,000 worth of products and the direct materials and direct labor cost $6,000 (COGS), the gross profit is $4,000. The gross margin is therefore 40%. This figure tells you how efficiently you are producing your core product, before any overhead.
Net margin includes everything
Net margin, or net profit margin, goes further by deducting all other operating expenses, interest, and taxes from the gross profit. The formula is: Net Margin = (Net Income / Total Revenue) × 100. This is the true 'bottom line'.
Continuing the previous example, if the company with $10,000 in revenue and $4,000 gross profit also has $2,000 in rent and administrative expenses, and $500 in taxes, the net income is $1,500. The net margin is 15%. This shows what percentage of revenue actually translates to profit the business can keep or distribute.
Why the difference matters
A business can have a very healthy gross margin of 60% but a negative net margin if its operating expenses (like marketing or rent) are too high. Conversely, a supermarket might have a gross margin of only 20% but a positive net margin of 2% because it relies on high volume and low operating overhead.
Investors and managers look at both metrics together. A declining gross margin suggests rising production costs or pricing pressure, whereas a stable gross margin with a declining net margin indicates rising administrative, interest, or tax burdens.