How do you calculate net profit margin?

Net Profit Margin % = (Net Profit ÷ Revenue) × 100, where Net Profit = Revenue − COGS − Operating Expenses − Interest − Taxes. If a business earns $50,000 in revenue and ends up with $6,000 in net profit after every expense, its net margin is ($6,000 ÷ $50,000) × 100 = 12%.

What is the difference between net profit margin and gross profit margin?

Gross profit margin only subtracts the direct cost of goods sold (COGS) from revenue. Net profit margin goes further and subtracts every other cost of running the business too — rent, payroll, marketing, software, loan interest, and taxes. Net margin is always equal to or lower than gross margin, and it's the number that reflects what a business actually keeps.

What counts as an operating expense versus COGS?

COGS is the direct cost of producing or acquiring what you sold — raw materials, wholesale unit cost, production labor. Operating expenses (OpEx) are the indirect costs of running the business regardless of sales volume that day: office rent, salaried staff, marketing spend, software subscriptions, insurance, and admin overhead.

What is a good net profit margin?

Net margin benchmarks vary widely by industry. Retail and grocery businesses often run 2%–5% net margins, restaurants typically land around 3%–9%, professional services and software commonly reach 15%–25%, and a small e-commerce brand with lean overhead can see 10%–20%. Comparing your margin against your own industry, not a generic average, is what actually matters.

Can net profit margin be negative?

Yes. A negative net margin means the business spent more than it earned in the period — common for early-stage companies investing heavily in growth, or an established business going through a slow season where fixed costs like rent and payroll exceed gross profit.

Net Profit Margin Calculator

(Bottom-Line Profit Tool)

Calculate net profit margin by working down from revenue through cost of goods sold, operating expenses, interest, and taxes — with gross and operating margin shown alongside it.

Step 1 — Revenue & Cost of Goods Sold

Total Revenue ($)

Gross sales for the period, before any deductions

Cost of Goods Sold (COGS $)

Direct materials, inventory, or production cost only

Step 2 — Operating Expenses

Rent / Facilities ($)

Salaries & Payroll ($)

Marketing & Ads ($)

Other Overhead ($)

Software, insurance, utilities, misc.

Calculated Results

Enter your revenue and costs to calculate net profit margin.

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Net Profit Margin vs. Gross Profit Margin

Net profit margin is the percentage of revenue a business keeps after every single expense is paid — not just the direct cost of the product. It's the number investors, lenders, and accountants actually care about, because a business can have a strong 60% gross margin and still lose money once rent, payroll, and marketing are subtracted.

Net Profit Margin % = (Net Profit ÷ Revenue) × 100

Net Profit itself is a chain of subtractions: start with revenue, subtract COGS to get gross profit, subtract operating expenses to get operating profit (EBIT), then subtract interest and taxes to reach net profit. Our Gross Profit Margin Calculator covers the first step in isolation if that's all you need.

Where Net Margin Typically Falls Short of Gross Margin

The gap between gross margin and net margin is almost always operating expenses — the costs that keep the lights on regardless of how many units sold today.

Rent & facilities: office, warehouse, or retail storefront lease.
Payroll: salaries for staff who aren't directly producing the product being sold.
Marketing & advertising: paid ads, content, agency retainers.
Interest & taxes: loan payments and income tax owed on the profit that's left.

Frequently Asked Questions (FAQ)

Gross margin only accounts for COGS. If operating expenses like rent, salaries, and marketing are large relative to revenue, they'll eat most of the gross profit before it becomes net profit — this is normal for service and brick-and-mortar businesses with high fixed overhead.

For a textbook-accurate net margin, yes. Many small business owners track "operating margin" (before interest and taxes) as a proxy day-to-day since it's easier to control, then check true net margin at tax time when interest and tax figures are final.