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Gross vs Net Profit Margin — What's the Difference?
Gross and net margin answer two different questions, and using one when you mean the other can badly mislead a pricing or profitability decision. Gross margin is what is left of each sales dollar after the cost of goods sold: (revenue − COGS) / revenue. Net margin is what survives after everything — COGS, operating expenses, interest and tax: net profit / revenue. A business can post a healthy 40% gross margin yet a thin 20% net margin once rent, payroll, interest and tax are subtracted. On revenue of $50 with $30 COGS the gross margin is 40%; take a further $10 of operating expenses, interest and tax and the net profit is $10, a 20% net margin. This mode models both from the right inputs so you never compute a "net margin" from COGS alone. Free, no login.
Gross margin = (revenue − COGS) / revenue — profit after the cost of goods only
- Net margin = net profit / revenue, where net profit = revenue − COGS − opex − interest − tax
- Gross is a pricing/product ratio; net is the bottom-line company-profitability ratio
- Worked example — revenue $50, COGS $30: gross profit $20 → gross margin 40%
- Worked example — same $50 revenue, plus $10 of opex + interest + tax: net profit $10 → net margin 20%
- A strong gross margin can still leave a thin net margin once fixed costs and tax are taken out
- Use the correct inputs per type — never derive net margin from COGS alone
- Negative net margin (a loss) is valid — it is shown, not clamped to zero
Frequently asked questions
What is the difference between gross and net profit margin?
Gross margin measures profit after only the cost of goods sold: (revenue − COGS) / revenue. Net margin measures profit after every cost — COGS, operating expenses, interest and tax — as net profit / revenue. Gross margin tells you whether your pricing covers the direct cost of what you sell; net margin tells you what the business actually keeps. A company with a 40% gross margin might have only a 20% net margin after rent, salaries, interest and tax. Between them sits operating margin, which subtracts operating expenses but not interest and tax.
How do I calculate net profit margin?
First find net profit: revenue − COGS − operating expenses − interest − tax. Then divide by revenue. With revenue of $50, COGS of $30, and $10 of operating expenses, interest and tax combined, net profit is $50 − $30 − $10 = $10, so the net margin is 10 / 50 = 20%. The key is to subtract every cost layer, not just COGS — computing a "net margin" from revenue and COGS alone actually gives you the gross margin and overstates profitability.
Which margin should I use?
Use gross margin when you are pricing a product or judging whether a sale covers its direct cost — it isolates the relationship between price and COGS. Use net margin when you are assessing the overall health of the business, because it reflects fixed costs, financing and tax. Operating margin sits in between and is useful for comparing operational efficiency across companies before financing and tax distort the picture. Analysts typically look at all three together as a margin waterfall: revenue → gross → operating → net.