What is gross margin?
Short answer: Gross margin is gross profit divided by revenue. It expresses the share of revenue remaining after the costs that the company classifies as cost of sales.
The formulas are:
Gross profit = revenue - cost of sales
Gross margin = gross profit / revenue x 100
Gross profit is an amount, while gross margin is a percentage. Neither term has a universal cost definition across every business. A manufacturer may include materials, production labour and factory overhead in cost of sales. A software company may include hosting and customer delivery costs. A services company must decide which delivery employees and subcontractors belong in the line under its accounting policy.
How gross margin is analysed
Finance should reconcile revenue and cost of sales to the income statement, then analyse changes by volume, mix, selling terms, input cost and operational efficiency. The same classification should be applied across periods or any change should be explained. Product and customer margins can show where a consolidated percentage hides a loss-making offering or a highly profitable concentration.
Margin percentage and gross profit amount answer different questions. A lower percentage can still produce more total gross profit if additional volume is attractive. A higher percentage can accompany lower gross profit if revenue contracts sharply. Fixed or semi-fixed delivery costs also mean that the relationship may change as capacity is added.
Example
In the first quarter, a company reports revenue of 8,000 and cost of sales of 5,200. Gross profit is 2,800 and gross margin is 35% because 2,800 divided by 8,000 equals 35%. In the second quarter, revenue rises to 9,200. Cost of sales rises to 6,256, producing gross profit of 2,944 and gross margin of 32%. Finance then separates the 1,056 cost increase into 700 from higher volume, 260 from a less profitable product mix and 96 from input-cost inflation. Revenue and gross profit both increased, but each unit of revenue contributed less before operating expenses. If a support cost of 250 was also reclassified from operating expenses into cost of sales, finance would present a consistent comparative before attributing the full decline to operations.
Why it matters in financing and a sale
Gross margin affects break-even, operating leverage and the credibility of a forecast. Lenders examine whether the margin leaves enough earnings to cover operating costs and debt service. Investors assess whether growth depends on discounting or costly delivery. Buyers test whether historical improvement comes from sustainable pricing and mix, temporary purchasing benefits, incomplete cost accruals or classification changes. Margin assumptions often flow directly into projected EBITDA and valuation.
Comparability limits
Analysis becomes unreliable when gross profit and gross margin are used interchangeably, directly attributable costs are omitted, companies with different classifications are compared, only blended margin is considered, or a contribution measure is called gross margin. SEC guidance notes that a non-GAAP measure calculated differently from a GAAP subtotal should not use the same label. Contribution margin instead deducts costs defined as variable for a particular decision. The applicable accounting framework and disclosed policy govern reported cost of sales. A transaction analysis may reclassify costs for comparability, but it should maintain a transparent bridge to reported accounts.