Finance⏱ 6 min read
Gross, Operating, and Net Profit Margin: What Each One Tells You
Profit margin is not one number — it's three, and each reveals something different about business health. Here's how to calculate all three and what they mean in practice.
When a business says it has a "20% margin", the question is: which margin? Gross, operating, and net margins each tell a different story — and confusing them leads to badly wrong conclusions about business performance.
Gross Profit Margin
Gross Profit = Revenue - Cost of Goods Sold (COGS)
Gross Margin % = (Gross Profit / Revenue) x 100
COGS includes: raw materials, direct labour, manufacturing costs
COGS excludes: rent, admin, marketing, depreciation
Example: bakery revenue £200,000
Flour, ingredients, packaging, baker wages: £90,000 (COGS)
Gross profit: £110,000
Gross margin: (110,000 / 200,000) x 100 = 55%
What Gross Margin Tells You
Gross margin measures the efficiency of production and direct delivery of products or services. A falling gross margin signals rising material or labour costs, pricing pressure, or a shift in product mix. Industry benchmarks vary enormously:
IndustryTypical Gross MarginCharacteristic
Software / SaaS70-80%Low marginal cost of each extra unit
Retail (fashion)50-60%High markup on manufactured goods
Restaurants60-70%Food cost around 30-35%
Construction15-25%High material and labour costs
Supermarkets25-30%High volume, low margin model
Operating Profit Margin (EBIT Margin)
Operating Profit = Gross Profit - Operating Expenses
Operating Margin % = (Operating Profit / Revenue) x 100
Operating expenses: rent, utilities, admin salaries, marketing,
insurance, depreciation — everything to run the business
(but not interest or taxes)
Continuing example:
Gross profit: £110,000
Rent: -£24,000
Utilities: -£6,000
Marketing: -£10,000
Admin salaries: -£30,000
Operating profit: £40,000
Operating margin: (40,000 / 200,000) x 100 = 20%
Net Profit Margin
Net Profit = Operating Profit - Interest - Tax
Net Margin % = (Net Profit / Revenue) x 100
Continuing example:
Operating profit: £40,000
Loan interest: -£5,000
Corporation tax (19%): -£6,650
Net profit: £28,350
Net margin: (28,350 / 200,000) x 100 = 14.2%
Reading the Three Margins Together
High gross, low operating margin:
→ Production is efficient but overhead costs are out of control
High gross, high operating, low net:
→ Good operations but heavy debt burden (high interest)
Gross margin falling while operating margin holds:
→ Cost of goods rising; offset by cutting overheads (unsustainable)
All three margins declining:
→ Core business problem — pricing, volume, or cost structure
Break-Even Revenue
Once you know gross margin %, you can calculate break-even:
Break-even revenue = Fixed costs / Gross margin %
Fixed costs (operating expenses): £70,000
Gross margin: 55%
Break-even: £70,000 / 0.55 = £127,273
At £127,273 revenue, gross profit exactly covers all fixed costs
and operating profit = £0. Every pound above this adds margin.