Revenue looks great until you count the unbilled hours.

Gross Margin measures the percentage of revenue remaining after subtracting the direct cost of delivering the product or service (Cost of Goods Sold). For SaaS companies, COGS typically includes hosting infrastructure, customer support, and professional services delivery. Gross margin is the foundation of all other profitability metrics and determines how much revenue is available to fund growth, R&D, and overhead.

Operating Margin measures the percentage of revenue remaining after subtracting all operating expenses including COGS, sales and marketing, R&D, and G&A, but before interest and taxes (EBIT). It reflects the core operational profitability of the business. Unlike gross margin, operating margin captures the cost of running and growing the entire organization.

Revenue Per Employee (RPE) measures total annualized revenue divided by the total number of full-time equivalent employees. It is a benchmark for organizational productivity and operational efficiency. As companies scale, RPE should increase as revenue grows faster than headcount, demonstrating operating leverage in the business model.

Operational Efficiency Ratio (OER) measures the cost of running operations relative to the revenue those operations generate, expressed as operating expenses divided by net revenue. A lower OER indicates that the organization is generating more revenue for each dollar of operational spending. It is used across industries to benchmark how efficiently an organization converts operational investment into output.