What Are Profit Margins? Gross, Operating, and Net Margins Explained
Profit margins show how much of revenue a company keeps as profit. We explain the three types (gross, operating, net), what each means, and how to use them to assess company efficiency.
Big revenue does not necessarily mean big profit
A company can sell billions but still profit little — if costs eat up most of the revenue. To know how much profit a company keeps from revenue, look at the profit margin. There are three types, each telling part of the story.
What a profit margin is
A profit margin shows what percentage of revenue a company turns into profit:
Profit margin = Profit / Revenue × 100%
The higher the margin, the more profit the company keeps per dollar of revenue — a sign of efficiency and/or pricing power.
The three types of profit margin
1. Gross margin
Gross margin = (Revenue − Cost of goods sold) / Revenue
Shows how much profit remains after direct costs of making the product. A high gross margin usually reflects pricing power or a cost advantage — the company sells at a good price relative to production cost.
2. Operating margin
Operating margin = Operating profit / Revenue
Further subtracts operating expenses (sales, administration...). Reflects the efficiency of the core business operations, before interest and taxes.
3. Net margin
Net margin = Net profit / Revenue
This is the "bottom-line" margin, after subtracting all costs — including interest and taxes. Shows what is truly left for shareholders per dollar of revenue.
Reading the three margins together
Comparing the three margins tells the story of the cost structure:
- High gross margin but low net margin: the product is profitable, but operating expenses, interest, or taxes are eroding profit. Worth investigating why.
- All three stable/improving: a sign of a healthy company with good cost management.
- Margins declining over the years: a warning — possibly due to rising competition, escalating costs, or lost pricing power.
Why profit margins matter
- Measure efficiency: high margins show the company manages costs and pricing well.
- Reflect competitive advantage: companies with an "economic moat" (brand, technology) usually sustain high margins.
- Useful for comparison: among companies in the same industry, higher margins usually signal higher quality.
Profit margins complement metrics like ROE/ROA and ROIC in the picture of company assessment.
How to use them when picking stocks
- Compare within the same industry — "good" margins differ greatly by industry (supermarkets have low margins, software high margins is normal).
- Look at the multi-year trend, not just one period.
- Combine all three margins to understand the cost structure.
- Do not view margins apart from revenue: high margins on shrinking revenue are less attractive than stable margins on growing revenue.
Conclusion
Profit margins show how much profit a company keeps from revenue, at three levels: gross (after direct costs), operating (after operating expenses), net (after everything). Reading the three together helps you understand the cost structure and company quality. Compare within the industry and over the trend, not a single number in isolation.
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