How to Calculate Profit Margin for a Small Business

Profit margin tells you whether your pricing actually works. Get it wrong and you're working hard for a number that looks like a salary but isn't. Get it right and you sleep at night.

Two figures matter. Both are simple. Most small business owners conflate them.

The two formulas

• Gross profit margin = (Revenue − Cost of Goods Sold) ÷ Revenue × 100
• Net profit margin = (Revenue − All Expenses) ÷ Revenue × 100

Gross margin tells you whether the thing you sell is priced above what it costs you to make. Net margin tells you whether the whole business is profitable after rent, salaries, software, taxes, and everything else.

A worked example

Say last month you brought in $100,000 in revenue. Direct costs (materials, shipping, payment processing) were $60,000. Overhead (rent, software, your salary, marketing) was $25,000.

• Gross profit = $100,000 − $60,000 = $40,000
• Gross margin = $40,000 ÷ $100,000 × 100 = 40%
• Net profit = $40,000 − $25,000 = $15,000
• Net margin = $15,000 ÷ $100,000 × 100 = 15%

That 15% net is what's actually yours to reinvest, save, or pay yourself out of after every other obligation is met.

Step-by-step calculation

1. Add up last month's revenue — total of every paid invoice, sale, or transaction.
2. Subtract direct costs — everything that scales with what you sell. Materials, payment fees, shipping, packaging, contractor labour for the specific job. That gives you gross profit.
3. Subtract overhead — rent, salaries (including yours), software subscriptions, insurance, marketing, accounting. That gives you net profit.
4. Divide each by revenue, multiply by 100 — that's your margin in %.

What "good" looks like (varies by industry)

Profit margins differ wildly by sector. A 5% net margin is dismal for a software company and excellent for a grocery store. Compare yourself to your industry, not the abstract.

Reference points (typical, not authoritative — your numbers depend on size, location, and stage):

• Restaurants and food service: thin gross margins, often single-digit net
• Retail (physical goods): mid-range gross, low single-digit net
• Professional services and consulting: high gross (low COGS), 10–20% net is achievable
• Software / SaaS: very high gross (often 70%+), net depends on growth stage

The U.S. Bureau of Labor Statistics publishes industry breakdowns; Census Bureau Economic Census data is the gold standard for sector comparisons. For a quick benchmark, run your numbers through the calculator and compare to peers in your category.

5 common mistakes that quietly destroy your margins

1. Forgetting payment-processing fees in COGS. Stripe, PayPal, and card terminals take ~3%. On thin margins that's a meaningful chunk.
2. Mixing gross and net. "We did 40% margins last month" — gross or net? Different conversation.
3. Not paying yourself before calling it net. If your salary isn't in the overhead column, your "net margin" is fiction.
4. Ignoring seasonality. One month's margin tells you almost nothing. Look at trailing 3 and 12 months.
5. Forgetting taxes. Net margin before taxes is not money you can spend.

Where to push if your margins are too thin

• Pricing. Most underpriced businesses can raise prices 5–10% and lose almost no customers. Test it.
• Supplier costs. If you've been with the same supplier for 2+ years, you're probably overpaying. Get three quotes.
• Overhead. Audit subscriptions quarterly. SaaS bloat is real.
• Mix. Some products and services have much higher margins than others. Push the high-margin work.

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