Every business owner talks about profit margins, but not everyone is calculating the same thing. Ask three different people "what's your margin?" and you might get three different numbers — all technically correct, all measuring something different. Understanding which margin you're looking at, and why it matters, is fundamental to knowing how healthy your business actually is.
The Three Types of Profit Margin
There are three key profit margins, and they appear in this order on a profit and loss (P&L) statement:
- Gross Profit Margin — revenue minus the direct cost of making or sourcing your product
- Operating Profit Margin — gross profit minus operating expenses (rent, salaries, utilities, etc.)
- Net Profit Margin — the final bottom line after everything, including tax and interest
Use our profit margin calculator to quickly calculate all three from your own revenue and cost figures.
Gross Profit Margin
Formula: (Revenue − Cost of Goods Sold) ÷ Revenue × 100
Cost of Goods Sold (COGS) includes the direct costs of making or acquiring the products you sell — materials, manufacturing, direct labour. It does not include overheads like rent or salaries for admin staff.
Example: You sell £50,000 of products. Your COGS is £30,000. Gross profit = £20,000. Gross margin = £20,000 ÷ £50,000 × 100 = 40%.
Gross margin tells you how efficiently you're producing your product. A falling gross margin usually means your costs are rising faster than your prices — often a warning sign. Use our gross profit calculator to monitor this over time.
Operating Profit Margin
Formula: (Operating Profit ÷ Revenue) × 100
Operating profit = gross profit minus all operating expenses (overheads). These include rent, utilities, salaries, marketing spend, and depreciation of assets.
Continuing the example: Operating expenses are £12,000. Operating profit = £20,000 − £12,000 = £8,000. Operating margin = £8,000 ÷ £50,000 × 100 = 16%.
Operating margin reflects how well your business is run day-to-day. It strips out the effects of financing (loans, interest) and tax to show the underlying operational performance.
Net Profit Margin
Formula: (Net Profit ÷ Revenue) × 100
Net profit is what's left after everything — COGS, overheads, interest on debt, and tax. It's the truest measure of profitability, but it's also the most susceptible to one-off items (a big interest payment, an unexpected tax bill) that might distort the picture in any given year.
If interest and tax amount to £2,500 in our example: Net profit = £8,000 − £2,500 = £5,500. Net margin = £5,500 ÷ £50,000 × 100 = 11%.
Margin vs Markup: The Classic Confusion
These two are frequently mixed up, and confusing them can cause significant pricing errors.
- Margin is calculated on the selling price: (Price − Cost) ÷ Price
- Markup is calculated on the cost: (Price − Cost) ÷ Cost
A product costs £60 and sells for £100. The margin is 40% (£40 ÷ £100). The markup is 66.7% (£40 ÷ £60). If you tell your team to apply a "40% margin" but they apply a "40% markup", your selling price will be wrong — and you'll earn less than you think.
What's a Good Profit Margin?
This varies enormously by industry:
- Software: gross margins of 70-80%+ are common
- Retail: gross margins of 30-50%, net margins of 2-5%
- Restaurants: net margins of 3-9% (notoriously tough)
- Professional services (consulting, law): net margins of 20-40%
Compare your margins to industry benchmarks rather than abstract "good" numbers. A 10% net margin in supermarkets is exceptional. In software, it's a sign something's wrong.
How to Improve Your Margins
- Increase prices: even a small price rise has an outsized effect on margin
- Reduce COGS: negotiate better with suppliers, reduce waste, improve processes
- Cut overhead: identify expenses that don't drive revenue
- Focus on higher-margin products: not all revenue is equally profitable
Track your margins monthly. A trend is more informative than a single data point — and catching a declining margin early gives you time to act before it becomes a crisis.
Further reading: Investopedia's breakdown of profit margin types is detailed and worth bookmarking. Read Investopedia's guide to profit margins.