Lesson 2 of 11 14 min
Profit and Margins
Gross profit, net profit, and why margins tell you more than totals.
Written by Mateo LermaLast reviewed 2 sourcesEditorial standards
All lessons in Understanding Businesses
Step 1: The lesson
What is a profit margin?
"Profit" means different things at different stages. Analysts look at three:
- Gross profit = revenue − cost of goods sold (COGS). How much is left after paying for what was sold.
- Operating income = gross profit − operating expenses. What the core business earns.
- Net profit (net income) = operating income − interest and taxes. The bottom line.
Key term
Margin
A profit number divided by revenue, shown as a percentage. A 10% net margin means the company keeps 10 cents of every dollar of sales.
Margins let you compare businesses of different sizes. They also reveal the type of business: software companies often have very high gross margins because an extra copy costs almost nothing to make, while grocery stores famously run on thin net margins — often just a few percent.
Thin margins aren't bad by themselves, but they leave little room for error. A small rise in costs can erase all the profit.
Step 2: See it
Maya's coffee cart: three levels of profit
Revenue of $120,000 becomes gross profit of $78,000 (65% margin), operating income of $18,000 (15%), and net profit of $14,000 (11.7%).
- Revenue
- $120,000
- Cost of goods sold
- −$42,000
- Gross profit65% gross margin
- $78,000
- Operating expenses
- −$60,000
- Operating income15% operating margin
- $18,000
- Interest and taxes
- −$4,000
- Net profit11.7% net margin
- $14,000
Step 3: Real-world example
Same profit, very different businesses
Two hypothetical companies each earn $1 million in net profit.
- Company A has $2 million in revenue — a 50% net margin.
- Company B has $50 million in revenue — a 2% net margin.
Now suppose costs rise by 3% of revenue for both. Company A still earns a healthy profit. Company B's $1.5 million cost increase wipes out its entire profit — it now loses $500,000. Same profit on paper; very different fragility.
Step 4: Try it
Margin calculator
This is Company B: $50 million in revenue and a 2% net margin. Raise operating expenses by $1,500,000 and watch the profit disappear.
Your numbers
Direct costs of what was sold: ingredients, inventory, materials.
Running the business: wages, rent, marketing, software.
Results
Gross margin
30%
Operating margin
3%
Net margin
2%
$1,000,000 net profit
| Revenue | $50,000,000 |
|---|---|
| − Cost of goods sold | −$35,000,000 |
| Gross profit30% margin | $15,000,000 |
| − Operating expenses | −$13,500,000 |
| Operating income3% margin | $1,500,000 |
| − Interest and taxes | −$500,000 |
| Net profit2% margin | $1,000,000 |
Educational calculator, not financial advice. Results are hypothetical estimates based on the numbers you enter.
Step 5: Knowledge check
Quiz: Profit and Margins (3 questions)
Answer each question, then check your answer to see the explanation. Retake it as many times as you like.
Question 1 of 3
Step 6: Summary
Summary: Profit and Margins
Gross profit subtracts the cost of what was sold; operating income subtracts running costs; net profit subtracts interest and taxes. Margins turn each into a percentage of revenue, making companies comparable and revealing how much room they have for mistakes.
Step 7: What you should remember
Key takeaways: Profit and Margins
- Gross → operating → net: three levels of profit.
- Margin = profit ÷ revenue.
- Margins reveal the kind of business and its fragility.
- Thin margins leave little room for rising costs.
Key terms in this lesson
Finished the lesson?
Mark it complete to track your progress.
Sources and further reading
Rules, rates, and official figures in this lesson are based on these sources. People and numbers in examples are hypothetical.
- 1.Beginners' Guide to Financial Statements (opens in a new tab)
U.S. Securities and Exchange Commission · sec.gov
- 2.How to Read a 10-K/10-Q (opens in a new tab)
Investor.gov (U.S. Securities and Exchange Commission) · investor.gov
Cite this lesson
Financial Literacy Club. (2026, September). Profit and margins. https://learnwithflc.org/courses/understanding-businesses/profit-and-margins
Spot an error or an out-of-date number? Tell us and we'll fix it. Read our editorial standards.