How is net profit margin calculated?
The formula: Net Profit Margin = ((Revenue − Total Expenses) / Revenue) × 100. Unlike gross margin, total expenses cover the entire cost base: COGS, payroll, rent, software subscriptions, marketing and advertising, accounting and consulting, depreciation, loan interest and taxes.
Net margin is the ultimate efficiency read on a business. A high gross margin paired with a thin net margin says the problem is not production or sourcing but the cost structure — usually bloated marketing spend, an inefficient team shape or financing costs. Reading both margins side by side is far more informative than either alone.
Reading the margin carefully
Net margin swings with timing: one-off investments, tax schedules or FX effects can distort a single quarter. Track a 3-12 month rolling average rather than a single month, and where possible strip out one-off items to compute a normalised margin as well.