What Is Operating Margin?
Operating margin measures the profitability of a company's core operations, calculated as Operating Margin = Operating Income / Revenue. Operating income, often called EBIT, is what remains after subtracting both cost of goods sold and operating expenses like selling, general and administrative costs and research and development.
Because it excludes interest expense and taxes, operating margin isolates how well the business itself performs, independent of how it is financed or where it pays taxes.
Gross Margin vs. Operating Margin
Gross margin only accounts for direct production costs, while operating margin also absorbs the overhead required to run the company. A business can have a stellar gross margin but a weak operating margin if it spends heavily on sales teams, marketing, or R&D.
Watching the gap between the two tells you about operating leverage: as revenue scales against a relatively fixed cost base, operating margin should expand faster than gross margin, which is the central thesis behind many growth-stage investments.
Example
Suppose a company has $200 million of revenue, $80 million of COGS, and $70 million of operating expenses. Operating income is $200 million - $80 million - $70 million = $50 million, so operating margin is $50 million / $200 million = 25%. Its gross margin in the same period is 60%, and the 35-point difference reflects its operating cost load.
Why It Matters
Operating margin is one of the cleanest ways to compare operational efficiency across companies, since it strips out differences in capital structure and tax rates. Sustained margin expansion is a hallmark of scalable, well-run businesses, and analysts model it explicitly when projecting earnings.
It also feeds directly into valuation work: EBIT and closely related EBITDA margins drive the operating assumptions in DCF models and the multiples used in comparable company analysis.
