What is profit margin?
Profit margin is profit expressed as a percentage of revenue or selling price. To calculate it, subtract the costs included in your chosen profit measure, divide the result by revenue, and multiply by 100. If an item sells for $60 and the relevant cost is $40, the profit is $20 and the margin is 33.33%. Margin helps you understand what share of each sales dollar remains after the costs you have included. Always identify whether you mean gross, operating or net margin, because each measure subtracts a different set of expenses.
What is markup?
Markup is profit expressed as a percentage of cost. The formula is (Selling price minus cost) divided by cost, multiplied by 100. With a $40 cost and a $60 selling price, the profit is $20 and markup is 50%. Businesses often use markup as a practical way to build a selling price from a known cost. The result depends on the cost base: if you leave out packaging, freight, labor or other relevant expenses, the markup calculation will not automatically cover them.
Why the percentages are different
Margin and markup use the same profit amount but different denominators. Cost is normally lower than selling price, so dividing by cost produces a larger percentage than dividing by selling price. This is why a 50% markup does not create a 50% margin. In the $40 cost and $60 selling price example, the $20 profit is 50% of cost but only 33.33% of the selling price. The figures are not contradictory; they describe the same transaction from two different perspectives.
How to convert markup into margin
To convert a markup percentage into margin, divide the markup rate by 100 plus the markup rate, then multiply by 100. For example, a 50% markup converts to 50 divided by 150, multiplied by 100, which equals 33.33% margin. This conversion is useful when a supplier or retailer quotes a markup but you need to compare the result with a margin target. Use the same cost definition throughout the calculation so that the comparison remains meaningful.
How to convert margin into markup
To convert a target margin into markup, divide the margin rate by 100 minus the margin rate, then multiply by 100. A 40% margin requires a markup of about 66.67%. This is because the profit must represent 40% of the final selling price, while markup expresses that same profit relative to the lower cost amount. A target margin must be below 100% for this conversion to produce a finite result. Fincelio's Markup Calculator includes a conversion mode for these calculations.
Which measure should a business use?
Use margin when you want to understand the share of revenue remaining as profit. It is useful for reviewing product performance, comparing sales channels and monitoring business results over time. Use markup when you need a straightforward way to add a percentage to a cost and create a starting price. Many businesses use both: markup to build a price and margin to evaluate the result. The important point is to label each percentage correctly and avoid comparing margin with markup as though they were interchangeable.
Include the costs that matter
A product's purchase price may not be its complete cost. Depending on the business, a pricing calculation may need to consider materials, direct labor, packaging, inbound freight, insurance, duties, handling and allocated production overhead. A sale may also involve outbound shipping, payment processing, marketplace commissions, advertising, discounts and returns. Decide which costs belong in unit cost and which are selling expenses. Avoid counting the same expense twice, and use a consistent method across the products you compare.
Worked example for an online seller
Suppose an online seller buys an item for $40 and sells it for $60. Before other expenses, profit is $20, markup is 50% and gross margin is 33.33%. If the seller also spends $4 on packaging and seller-paid shipping, the amount remaining becomes $16 before any other expenses. The margin based on this broader cost is 16 divided by 60, or 26.67%. The markup on the expanded $44 cost base is 16 divided by 44, or 36.36%. The example shows why the cost definition should be stated.
Common mistakes and a practical review
Common mistakes include using cost as the denominator for margin, leaving out expenses, mixing currencies, comparing percentages calculated on different cost bases and assuming that a high markup guarantees customer demand. Review the actual selling price after discounts, not only the list price. Compare the result with competitor offers and customer expectations, then check actual sales and expenses after launch. Use Fincelio's Profit Margin Calculator to estimate profit and margin, and its Product Cost Calculator to build a more complete unit-cost estimate. These tools provide planning estimates rather than professional accounting advice.