The Small Business Margin Estimator measures how much of revenue remains after selected business costs. It reports gross margin from revenue and cost of goods sold, then operating margin after payroll, overhead, marketing, and other operating expenses.
Margin percentages make businesses of different sizes easier to compare because they express profit relative to sales. Owners can use the results to evaluate pricing, monitor cost pressure, and identify whether a change in revenue is producing a proportional change in profit. All inputs should cover the same accounting period and use the same revenue-recognition basis.
1. Select a consistent month, quarter, or year.
2. Enter revenue for that period.
3. Enter cost of goods sold to calculate gross margin.
4. Enter all remaining operating expenses as one combined amount.
5. Compare gross margin with operating margin to see how overhead changes profitability.
Operating margin shows the percentage of each revenue dollar left after the entered operating costs.
Negative margins are possible when costs exceed revenue. This is not a cash-flow measure.
Given: Revenue of $120,000, COGS of $48,000, and other operating expenses of $42,000.
Calculation: Gross profit = $120,000 − $48,000 = $72,000. Gross margin = $72,000 ÷ $120,000 = 60%. Operating profit = $72,000 − $42,000 = $30,000. Operating margin = $30,000 ÷ $120,000 = 25%.
Result: The business keeps an estimated 25 cents of operating profit per revenue dollar.
Gross margin subtracts only cost of goods sold. Operating margin also subtracts the operating expenses entered in the calculator.
A conventional profit margin generally cannot exceed 100% when revenue and costs are entered normally, but data classification errors can produce unusual results.
Include owner compensation when it is treated as a business operating expense for the analysis you are performing.
Any period works, but revenue and every cost must cover exactly the same dates.
Margin divides profit by selling price or revenue. Markup divides the price increase by cost, so the percentages are not interchangeable.