What Is Gross Margin and How Is It Calculated?

Gross margin is the percentage of revenue left after you subtract the direct cost of making or buying the products you sell. It tells you how much profit you keep on every pound of sales before paying for operations, salaries, or overheads.

For growing SMEs, gross margin is the first number to understand. It shows whether your core business model works. A healthy gross margin gives you room to invest in sales, customer support, and growth. A shrinking one signals trouble in your cost structure.

How to Calculate Gross Margin

The formula is straightforward:

Gross Margin (%) = (Revenue − Cost of Goods Sold) ÷ Revenue × 100

Here's a concrete example. Imagine you're a food distributor:

Revenue: £100,000 Cost of goods sold: £60,000 Gross margin: (£100,000 − £60,000) ÷ £100,000 × 100 = 40%

That means you keep 40 pence of every pound in sales before paying for your warehouse, team, or delivery trucks. The remaining 60 pence pays for inventory.

Don't confuse gross margin with profit margin. Profit margin includes all your operating costs (rent, salaries, utilities). Gross margin only excludes the cost of goods. That's why gross margin comes first.

Why It Matters

Pricing power. If your gross margin is too low, you don't have room to discount or compete on price. A healthy margin (typically 40% or higher in distribution, 50%+ in services) means you can absorb market pressure.

Unit economics. Gross margin tells you whether individual products or customers are profitable. If one product line has a 25% margin and another has 60%, you know where to focus.

Operational efficiency. A declining gross margin often signals rising material costs, supplier price increases, or inefficiency in production or procurement. Spotting this early lets you renegotiate contracts or redesign processes.

Common Mistakes

Confusing gross margin with profit. Owners often think a 40% gross margin means they're keeping 40% as profit. They're not. After operating expenses, the actual profit is much lower. Gross margin is the starting point, not the finish line.

Ignoring COGS changes. Your cost of goods isn't fixed. Supplier prices shift, inventory shrinkage happens, manufacturing scrap increases. If you don't monitor gross margin regularly, you won't see these shifts until they've damaged your bottom line.

Applying a single margin to everything. SMEs with multiple product lines or customer segments often assume one average gross margin. In reality, products and customers have wildly different margins. Bundling them hides the fact that some parts of your business are losing money.

How ERP Software Helps

Manually calculating gross margin in spreadsheets means waiting weeks for accurate data. By then, the problem has compounded. An ERP system shows you gross margin in real time, broken down by product, customer, or sales order.

Enterpryze tracks gross margin across your inventory costing methods (moving average cost, last purchase price), so you always see the true cost of goods. You can analyse profitability by product, by customer, or by project. If a supplier price increases, you see the impact on margins instantly. If production scrap rises, it shows in your cost per unit. This visibility helps you make faster pricing and sourcing decisions.

See how batch traceability in an ERP helps you track costs and catch margin leaks early.

Ready to see your margins clearly? Get in touch to discuss how Enterpryze surfaces profitability insights your spreadsheets miss.

FAQ

What is a good gross margin? It depends on your industry. Retail typically runs 20–40%. Food and beverage distribution sits around 25–35%. Software and services often see 60%+. Compare yourself to competitors in your sector, not across industries.

Is gross margin the same as contribution margin? No. Contribution margin subtracts variable costs only (materials, direct labour). Gross margin subtracts all cost of goods sold. For most SMEs, they're close, but contribution margin is more useful for pricing decisions on individual products.

How do I improve my gross margin? Negotiate better supplier terms, reduce production waste, eliminate slow-moving inventory, or raise prices. Most often, it's a combination. Track which lever moves the needle in your business.

How often should I calculate gross margin? Monthly minimum. Weekly if you're in a volatile industry like food distribution or manufacturing. Real-time visibility is better. An ERP system lets you check it any time without rebuilding a spreadsheet.