Gross margin vs operating margin vs net profit margin: what each one measures

Gross margin tells you what's left after a company pays for the direct cost of what it sells. Operating margin tells you what's left after it also pays for running the business. Net margin tells you what's left after tax, interest and anything else that has nothing to do with day-to-day operations. The three numbers answer three different questions, and comparing them tells you where a company's profit is coming from and where it is being spent.

How each margin is worked out

Gross margin is revenue minus the cost of the goods or services sold, divided by revenue. For a hardware business that cost includes components, assembly and warranty claims; for a software business it is mostly the cost of running the servers and support that deliver the product. It says nothing about how much the company spends on research, marketing or head office.

Operating margin takes gross profit and subtracts operating expenses, principally research and development and selling, general and administrative costs, then divides by revenue. This is the layer that separates companies with similar gross margins but very different spending: one business ploughs its gross profit back into research, another spends it on advertising, a third keeps more of it as operating profit. Comparing gross margin vs operating margin shows how much of a company's gross profit is consumed before it reaches operating income.

Net profit margin takes operating income and subtracts interest paid on debt, tax owed to governments, and any one-off gains or charges, then divides by revenue. None of these relate to how well the core business is run. A company can improve its operating margin while its net margin falls, if its tax rate rises or a one-off charge lands in the same period, and the reverse is equally possible.

Operating margin meaning: the clearest read of the business itself

Because it sits before financing and tax decisions, operating margin is usually the single best figure for judging how profitable a company's actual operations are, independent of how it is funded or taxed. Apple's trailing-twelve-month operating margin reached 33.0%, up 1.0pp from a year earlier. That places it at the 91st percentile of Apple's own margin history, within a range running from a low of 24.1% to a high of 35.7%. Read against its own record rather than a single year, the current level sits near the top of where Apple's operating margin has been, not at a new extreme beyond it.

What sits below operating margin

Apple's gross margin over the same period was 48.8%, meaning the gap down to its 33.0% operating margin reflects research and development and selling, general and administrative spending, without the filings used here breaking out how much of that gap is one versus the other.

Below operating income, Apple's net margin was 27.6%. But net margin on its own does not say whether that profit converted into cash. Over the same period, free cash flow grew 37.8%, well ahead of net income's 18.0% growth. The filings used here do not explain that gap: it could reflect the timing of working capital, tax payments or capital spending rather than anything about the quality of the 27.6% net margin itself, and a reader should treat it as a separate question from the margin figures above, not fold it into them.

Reading a margin trend over several years

A single quarter's margin says little on its own; the useful comparison is against the same company's own history, which is why Apple's 33.0% operating margin is more informative set against its 24.1%–35.7% range than as a standalone number. Not every margin here carries that kind of multi-year marker: the gross margin and net margin figures above are single TTM readings without an equivalent percentile or range in this dataset, which limits how much can be said about whether 48.8% or 27.6% are high or low by Apple's own standards.

Limits of this comparison

The net margin figure cannot be split into its tax, interest and one-off components from the data used here, so a reader cannot tell how much of the gap between Apple's 33.0% operating margin and 27.6% net margin comes from each source. The free cash flow growth of 37.8% against net income growth of 18.0% is a sizeable divergence, and nothing in the filings cited explains it; it should be read as an open question rather than evidence about the net margin figure itself. For the fuller run of Apple's margin and cash-flow history, see the company's page at /stocks/aapl/.

What it means for value

Fundamentalytics' model values Apple using free cash flow margin as one of its inputs. Apple's free cash flow margin rose 4.7pp to 28.4% over the TTM period; if that pace of margin gain were to persist, our model's value would be 19.8% higher. The same model's value falls 3.5% for every 1pp the free cash flow margin is lower, all else equal. These are model values under stated assumptions, not a comparison with the share price.