How to Calculate Profit Margin: Formula, Examples and Common Mistakes

Profit margin shows how much of each dollar in sales remains after a defined set of costs. It is one of the simplest ways to compare pricing decisions, track performance, and understand whether revenue is translating into profit.

Gross profit margin formula

Gross profit margin (%) = (Revenue − Cost of Goods Sold) ÷ Revenue × 100

For example, a business sells a product for $80 and spends $50 on the product itself. Gross profit is $30, and gross profit margin is ($30 ÷ $80) × 100 = 37.5%.

Margin versus markup

Margin and markup use different denominators. Margin compares profit with selling price; markup compares profit with cost. In the example above, margin is 37.5%, while markup is ($30 ÷ $50) × 100 = 60%. Treating the two as interchangeable can lead to incorrect prices.

How to calculate margin step by step

Identify sales revenue for the same period or product.
Subtract the corresponding cost of goods sold (COGS).
Divide gross profit by revenue.
Multiply by 100 to express the result as a percentage.

What about net profit margin?

Net profit margin uses net income rather than gross profit: Net profit margin = Net income ÷ Revenue × 100. Net income reflects additional expenses such as operating costs, interest and taxes, depending on the financial statements used. Gross and net margins answer different questions, so always label the metric clearly.

Common mistakes

Dividing profit by cost instead of revenue when calculating margin.
Mixing revenue from one period with costs from another.
Confusing gross profit with net income.
Ignoring returns, discounts or other adjustments in reported revenue.
Comparing businesses with very different cost structures without context.

Use an online calculator

Explore the OmniCalc calculator library to find profit and business calculation tools. A calculator speeds up arithmetic, but accurate inputs and consistent definitions are still essential.

Frequently asked questions

Can profit margin exceed 100%?

Under the standard margin formula with nonnegative costs and positive revenue, gross profit margin cannot exceed 100%.

Is a higher margin always better?

Not necessarily. Sales volume, fixed expenses, customer retention and industry economics also matter.