Markup vs. Margin: The Difference That Costs You Money

Same profit, two different percentages

Markup measures profit against what something cost you. Margin measures the same profit against what you sold it for. Because the selling price is bigger than the cost, the margin percentage is always smaller than the markup percentage for the same deal.

Example: a service that costs you 100 and sells for 150 has a 50% markup (50 profit over 100 cost) but only a 33% margin (50 profit over 150 price). Same 50 in your pocket, two very different-looking numbers.

Why the mix-up costs money

If you mean to keep a 40% margin but apply a 40% markup, you end up with only a 29% margin — a meaningful shortfall on every sale that compounds across a year. The safer habit is to price from the margin you need: price = cost ÷ (1 − margin), which locks in the margin regardless of cost.

Which one should you use?

Use margin when you care about profitability and comparing across products — it is the language of healthy businesses. Use markup as a quick rule of thumb when adding a consistent uplift to costs. Just never compare one to the other as if they were the same number.