Gross margin is revenue less the direct cost of delivering it, divided by revenue. Operating margin subtracts the running costs of the business as well: sales, marketing, research and administration. Gross margin describes the product. Operating margin describes the company built around it.
What sits between them
The gap between the two lines is operating expenses, and reading it is more informative than reading either margin alone. A software business with 80% gross margin and 5% operating margin is spending 75 points of revenue on people and marketing. That is either an investment in growth or an inability to stop spending, and the difference is the whole thesis.
A supermarket with a 25% gross margin and a 4% operating margin has almost no gap to work with. It cannot fix a bad year by cutting overhead, because there is barely any overhead relative to the cost of goods.
Which one to read, and when
Gross margin for the product. It answers whether customers value what you sell above what it costs to deliver, and it moves first when pricing power changes or input costs rise. It is also the ceiling: a company can never earn an operating margin above its gross margin, so a low gross margin caps the business permanently.
Operating margin for the company. It answers whether the organisation converts that product advantage into profit, and it is where operating leverage shows up as revenue scales past fixed costs.
Stage matters. Early on, gross margin is the honest signal and operating margin is meaningless, because a growing company is deliberately spending ahead of revenue. In operating leverage and capital return, operating margin becomes the number that decides, because the growth spending should now be producing profit.
The comparison that actually decides
Track both across five years and watch which direction each moves.
Gross margin flat, operating margin rising: the best pattern. The product is holding its value while the company grows into its cost base. That is operating leverage working.
Gross margin falling, operating margin flat: worse than it looks. Something is wrong with pricing or input costs, and management is masking it by cutting overhead. Overhead runs out.
Gross margin rising, operating margin falling: the company is spending its product advantage on customer acquisition. Fine if retention is strong, which is what net revenue retention tells you, and expensive if it is not.
Where the comparison breaks down
Companies decide for themselves what goes into cost of revenue. Two competitors can classify the same engineer differently, one inside gross margin and one below it, which makes gross margins less comparable across companies than they appear. Operating margin is harder to manipulate this way, because it captures everything above interest and tax regardless of where it was filed.
So compare gross margin against a company's own history, and use operating margin when comparing two companies to each other.
See both margins across ten years
Stock Simplifier charts gross and operating margin side by side for any US stock, which is how the gap between them becomes readable. Free to start.
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Frequently asked questions
Related
- Gross margin, the full guide to the first line and what it reveals.
- Operating leverage, why the gap between the two narrows as revenue grows.
- How to read an income statement, where both margins sit and what surrounds them.
- Pricing power, what a holding gross margin through inflation actually proves.