THE NUMORIX GUIDE
How to use the Margin Calculator
Last reviewed September 14, 2026
What this calculator does
The calculator computes gross profit as revenue minus cost of goods sold and gross margin as gross profit divided by revenue.
Formula and method
The calculator computes gross profit as revenue minus cost of goods sold and gross margin as gross profit divided by revenue. Operating profit subtracts operating expenses from gross profit, and operating margin divides that result by revenue. The route sets netMargin equal to operatingMargin rather than collecting a separate net-income input.
Variables and inputs
Enter revenue, cost of goods sold, and operating expenses. All are dollar amounts for the same reporting period. Results include gross and operating profit plus gross, operating, and route-defined net margins.
Worked example
For $500,000 revenue, $300,000 cost of goods sold, and $120,000 operating expenses, gross profit is 500,000 - 300,000 = $200,000 and gross margin is 200,000 / 500,000 x 100 = 40%. Operating profit is 200,000 - 120,000 = $80,000, so operating margin is 80,000 / 500,000 x 100 = 16%.
How to interpret the result
Gross margin describes what remains after direct product or service costs; operating margin also absorbs entered operating expenses. Compare periods or businesses only when revenue recognition and cost classifications are consistent.
Common mistakes to avoid
Do not put operating expenses into cost of goods sold unless the accounting definition calls for it. Use the same period for all three inputs. Do not call the route's net margin a true net margin when interest, taxes, and other below-operating items are not entered.
Assumptions and limitations
The engine defines netMargin as operatingMargin and does not model interest, income tax, extraordinary items, depreciation separately, or nonoperating income. It also does not validate negative or unusual accounting inputs.