Invest Glossary

Plain-English definitions, reviewed by an independent investor

Operating Margin

Operating margin is the share of revenue left after running costs but before interest and tax.

Operating margin is the share of revenue left after running costs but before interest and tax.

Operating Margin = Operating Income ÷ Revenue × 100%

A quick example

A software company earns $30 million of operating income on $100 million of revenue, a 30% operating margin. A grocery chain earns $4 million on the same $100 million, a 4% margin — and both can be perfectly healthy, because the grocery turns over inventory fast while software carries near-zero cost of goods. The margin tells you how much room a company has between its prices and its running costs; high margins fund R&D, marketing, and buffers, while thin margins leave little cushion for a downturn.

Picture this

A restaurant chain’s operating margin slips from 9% to 6% over three years even as revenue grows. Staff wages, food costs, and rent rise faster than the menu prices the chain can push through without losing customers. Wall Street notices the margin compression before the revenue slowdown and marks the stock down. The scenario is common: margin tells you about the business’s engine before the top line does, which is why management teams obsess over it.

What it means for you

It shows pricing power and cost control before financing distort the picture.

How to apply it

Compare a company’s operating margin against its own history and its direct peers, never across unrelated industries. A margin that is compressing over several quarters is often the earliest sign of lost pricing power.

Common mix-ups

Compare within an industry; a thin-margin grocery is fine, a thin-margin software firm is not.

Key takeaway

Operating margin measures pricing power and cost control before financing distorts the picture, and it is the earliest signal of trouble. A compressing margin usually means costs are rising or prices are falling, and it appears in the financials long before the bottom line turns. Compare margins only within an industry, because a grocery at 4% and software at 30% are both healthy. The trend over several quarters is the number that tells the real story.

Definitions reviewed by the Investing Glossary editorial team.

Frequently Asked Questions

What is a good operating margin?

Software often tops 30%; retail may be single digits. Context is everything.

Operating vs net margin?

Operating excludes interest and tax; net is what is left at the very bottom.

Why is margin compression bad?

It usually means rising costs or falling prices, which erode profit faster than revenue falls.

Operating vs gross margin?

Gross margin subtracts only direct costs; operating also subtracts overhead and selling costs.

Related terms

Gross MarginNet Margin