What it is
Operating margin divides operating profit by revenue, showing what is left after cost of goods and SG&A.
Formula
Operating margin = operating profit ÷ revenue × 100%. KRW 120 billion of operating profit on KRW 1 trillion of sales is a 12% margin.
What to keep in mind
Rising sales with a falling margin can signal cost pressure or price competition. Normal levels vary widely by industry.
This explanation is general information, not investment advice. Rules reflect September 2026 and may change; check official exchange and broker notices.