Operating Margin Calculator: Operating Profit Margin
Measure operating margin — the share of revenue left after every cost of running the business, but before interest and tax.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Profit margin | Markup | Profit |
|---|---|---|---|
| $500k rev · $425k costs | 15.00% | 17.65% | $75,000.00 |
| $1M rev · $820k costs | 18.00% | 21.95% | $180,000.00 |
| $250k rev · $260k costs | -4.00% | -3.85% | -$10,000.00 |
| $120k rev · $90k costs | 25.00% | 33.33% | $30,000.00 |
How This Calculator Works
Enter total revenue and total operating costs: the cost of goods sold plus salaries, rent, utilities, marketing, and other overheads. The calculator finds operating profit and expresses it as a margin against revenue. Because it captures the full cost of operations, operating margin is the cleanest read on whether the core business is profitable.
The Formula
Profit Margin and Markup
Markup = (Revenue − Cost) / Cost × 100 — the same profit measured against cost instead of revenue
Worked Example
A company with $500,000 of revenue and $425,000 of operating costs earns $75,000 of operating profit. That is a 15% operating margin — the business keeps 15 cents per revenue dollar before interest and tax are taken into account.
Key Insight
Operating margin strips out financing and tax effects, so it compares the underlying health of two businesses fairly even when one carries debt and the other does not. A rising operating margin usually signals real efficiency gains.
Frequently Asked Questions
What is operating margin?
Operating margin is operating profit as a percentage of revenue. Operating profit is what remains after all operating costs but before interest payments and income tax.
What costs count as operating costs?
They include the cost of goods sold plus every overhead of running the business: wages, rent, utilities, marketing, insurance, and depreciation. They exclude interest and tax.
How does operating margin differ from gross margin?
Gross margin subtracts only production cost. Operating margin subtracts production cost and every overhead, so it is always lower and reflects the true cost of operating.
Why exclude interest and tax?
Interest depends on how a business is financed and tax on where it operates. Removing both isolates how well the core operations perform, which is what operating margin is meant to show.
What is a healthy operating margin?
It is industry-specific, but a margin that is positive and stable or rising is a good sign. Compare against sector benchmarks rather than judging the number in isolation.
Related Calculators
Data Sources & Benchmarks
This calculator draws on 3 independent, dated sources.
Methodology & Review
Operating profit is revenue minus all operating costs, before interest and tax. Margin expresses that profit against revenue. The calculator reflects only the figures entered and assumes operating costs include every overhead.
Written by Ugo Candido · Last updated May 17, 2026.