Plain definition
Operating profit margin equals operating profit ÷ revenue. It shows the proportion of revenue remaining as operating profit under the company’s presentation, so comparisons require consistent classification and period.
Illustrative example
Monetary examples use Saudi riyals (SAR). The same principles apply in other currencies.
A business earns operating profit on revenue, giving a 15% margin. A new contract would add revenue and operating profit, a 5% margin on that contract. Existing work is unaffected and the extra costs include all resources the contract requires.
The combined result becomes profit on revenue: about 13.3%. The percentage falls while profit rises by . Management should examine the additional return, capacity, cash needs, and customer risk instead of rejecting the contract merely because it lowers the average margin.
Why it matters
A percentage can improve because revenue fell less than profit, or worsen while absolute profit rises. The denominator matters.
Practical consequence
Compare margin with operating profit in SAR, explain price and cost drivers, and use a consistent presentation before comparing periods or competitors.