The three margins answer three different questions
Gross margin shows the share of revenue left after cost of revenue. Selling, administrative and research costs may still remain below that line, so the ratio alone does not establish final profitability. Business models and cost classifications differ across industries; the same numerical margin is not a universal operating standard.
Operating margin divides operating income by revenue. A wide gap from gross margin is a starting point for examining the operating costs between the two lines. Check the statement and accounting-policy notes for where research, selling, administrative and amortization costs sit; the gap alone cannot distinguish investment in growth from inefficiency.
Net margin divides period net income by revenue. Non-operating results, tax, discontinued operations and other applicable items can make it move differently from operating margin. Keep consolidated net income separate from income attributable to the parent, and check for one-off items or changes in presentation between the periods compared.
Read the gap between operating and net income
The calculator also reports operating income minus net income. Use the gap as a starting point for tracing what lies between the two profit measures. A stable percentage does not establish that most of it is tax: reconcile the actual interest, tax, associate results and other intervening lines separately.
If the gap changes, first trace the lines below operating income, then use the relevant notes and management discussion to investigate the larger movements. Interest and foreign-exchange results are possible items, not established causes. Crossing an arbitrary percentage threshold does not by itself diagnose debt stress or deteriorating operations.
Net income can exceed operating income. A disposal result or tax adjustment may contribute, but the cause is unknown until the filing is checked. Read the net-margin increase separately from the operating-margin movement, then investigate whether the conditions behind the intervening item could recur in another period.
Conditions to align before comparing margins
The distribution beside the result uses collected companies for which this particular measure can be calculated. A ratio has no currency unit, but that does not make companies with different industries, reporting periods or accounting policies equivalent peers. It describes a position in this collection, not a statistic for the entire population of listed companies.
Read the percentile as the share of observations at or below the entered value. It is neither a profitability verdict nor a safety rating. For a comparison, select compatible business segments and periods, check revenue and operating-income definitions and consolidation scope, then recalculate using the figures in the original filings.