How do you calculate operating margin?

Divide operating income by revenue and multiply by 100. Both figures sit on the income statement in the earnings release or the 10-Q. A company with $500 million of revenue and $40 million of operating income has an 8% operating margin, meaning 8 cents of every sales dollar is left after running the business.

Is operating margin better than net margin for comparing companies?

For comparing how well businesses run, it is usually cleaner. Operating margin stops before interest and tax, so two companies with different amounts of debt or different tax situations can still be compared on their operations. Net margin tells you what reached shareholders, and both are worth reading.

What Is a Good Operating Margin? Compare It With Peers

Q: What Is a Good Operating Margin? Compare It With Peers

There is no single good figure, because margins depend heavily on the industry. A good operating margin is one that compares well with close peers and with the company's own history, and that is holding steady or improving over several quarters for reasons you can identify.

Eight percent sounds thin. For some businesses it is excellent, and for others it would be a crisis, and nothing about the number itself tells you which. Grocers, software firms, airlines and chip designers carry very different cost structures, from the high volume and low markup of a supermarket shelf to the near-zero cost of selling one more software license, and their operating margins sit in ranges so far apart that a single “good” threshold would mislead you about almost all of them.

So answer it by comparison. Look across, at peers. Then look back, at the company’s own past.

How do you compare a margin with peers?

The sum is simple: operating income over revenue, as a percentage. Both lines appear in the income statement of any earnings release, and the profit margin calculator will do the division if you feed it the figures.

Take a hypothetical company A and one hypothetical peer in the same business.

Against the peer, A looks weaker. Against its own past, it is improving. That is real progress: two points of margin in a year is a real change on $500 million of revenue, worth $10 million of operating income at current sales. Both readings are true at once, and the useful question is whether A is closing the gap on the peer or has simply found a better quarter.

Pick peers with care. Two or three close ones beat ten loose ones. A company that sells the same thing to the same customers is a peer. A company in the same broad sector with a different business mix is not much of one, and comparing a manufacturer with a firm that licenses software because both are filed under “technology” will produce a gap that explains nothing.

Why does the trend matter more than the level?

Direction tells you what management is doing with the business. A margin that climbs quarter after quarter usually means revenue is growing faster than costs, prices are rising, or the company is cutting spending. A margin that slides says the opposite. Either way, the level alone hides it.

Look at several quarters in a row, set against the same quarters a year earlier. Seasonal businesses swing inside a year, so comparing a holiday quarter with a spring one can make a steady company look erratic.

What drove the change?

Once you see the trend, find the cause. It usually sits in one of a handful of places on the income statement.

Gross margin. If the cost of goods rose faster than prices, the damage starts at the top.
Operating expenses. Rising sales, marketing or research spending can pull the margin down even while gross margin holds.
Revenue growth. With a lot of fixed costs, extra sales drop through to profit fast. That effect is operating leverage, and it works in reverse when sales fall.
One-time items. A restructuring charge or a gain on a sale can move the margin in a single quarter without saying anything about the underlying business.

A margin that improved because the company raised prices and kept its customers is a stronger signal than one that improved because it cut research spending. The second can reverse, and it can cost growth later.

Where does the comparison break down?

Accounting choices differ between companies. One firm may book certain costs above operating income and another below it, and some present “adjusted operating income” that strips out items the GAAP line includes. Compare GAAP to GAAP unless you know exactly what each adjustment removes.

Young or fast-growing companies can run thin or negative margins on purpose while they spend to win market share. The level then says little. The test is whether the margin moves the way management said it would. If the plan was to reach a target margin once a new product line scaled, and several quarters later revenue has grown while the margin has stayed flat or slipped, the spending is not producing what was promised, and the next release deserves a harder read.

A company can also post a good margin on shrinking revenue. Eight percent of a smaller business is still less money.

The column arguing that operating margin is the earnings line to read first makes the case for starting there before EPS, and the income statement lesson walks through each line from revenue down. More on reading results sits in the earnings section.