Operating Margin Calculator

Enter revenue, COGS, and operating expenses. The tool computes operating income (revenue − COGS − OpEx) and operating margin as a percentage of revenue.

Use it as the second-pass profitability check after gross margin. Gross margin shows whether the product makes money; operating margin shows whether the business does, after rent, salaries, marketing, and other recurring overhead.

The number excludes interest, taxes, depreciation, and amortization — those sit below operating income on the income statement. If you need EBITDA or net margin, add depreciation and amortization back, or run a separate calculation including taxes and interest expense.

Operating income = revenue − COGS − operating expenses. Operating margin = operating income ÷ revenue, expressed as a percentage. The metric strips out direct production costs (COGS) and the recurring overhead that keeps the lights on (rent, salaries, marketing, software). What's left is operating income — what the business produces from its actual operations, before financing and tax decisions get made.

Worked example. A subscription business reports $10M revenue, $1.5M COGS, $7M operating expenses (salaries, rent, AWS, marketing). Operating income = $1.5M. Operating margin = 15%. By contrast, a SaaS leader at scale might run 25-35% operating margin in steady state; an early-growth SaaS company often runs negative operating margin while burning cash on growth investments. Both can be the right strategy at different stages — operating margin is a snapshot, not a verdict.

The number to watch over time: the trajectory. Operating margin trending up means the business is getting more efficient — either gross margin improving, OpEx growing slower than revenue, or both. Trending down means the opposite. A flat-to-up trajectory in operating margin alongside revenue growth is the signature of a healthy scaling business. Trending down operating margin during fast growth is sometimes acceptable (you're investing); during slow growth it's a fire alarm.

What's excluded by design. Interest expense (financial structure decisions, not operations). Income taxes (varies by jurisdiction and structure). Non-cash items like depreciation and amortization (don't reflect cash operations directly — although GAAP includes them in OpEx for the operating margin calc). One-time gains or losses from asset sales, restructurings, etc. (not recurring). Strip those out and you get a comparable view of the operating engine across companies and over time.

A useful related metric: contribution margin, which is revenue minus only variable costs (variable COGS plus variable OpEx like sales commissions). Contribution margin tells you how much each additional dollar of revenue contributes to covering fixed overhead. For unit-level pricing decisions, contribution margin matters more than gross or operating margin. The tool focuses on operating margin because that's the line GAAP defines and the public comps report.