Margin vs Markup Explained
4 min read · Last reviewed July 1, 2026
Margin and markup are two of the most commonly confused terms in business, and the confusion is expensive. They use exactly the same two numbers — cost and selling price — but express the relationship differently, so a '50% margin' and a '50% markup' are not the same thing.
This guide explains each clearly, shows why mixing them up erodes profit, and gives you a quick way to convert between the two.
What markup means
Markup is how much you add to your cost, expressed as a percentage of that cost. If an item costs 40 and you add 20, your markup is 20 ÷ 40 = 50%, giving a selling price of 60.
Markup answers the question 'how much do I add on top of what I paid?' — it's anchored to the cost.
What margin means
Margin is your profit expressed as a percentage of the selling price, not the cost. Selling that same item for 60 with a 20 profit gives a margin of 20 ÷ 60 = 33.3%.
So the same deal is a '50% markup' and a '33.3% margin' at once. Margin answers 'what share of the sale price is profit?' — it's anchored to the price, and it can never exceed 100%, whereas markup can.
Why the difference costs money
If you want a 40% margin but accidentally apply a 40% markup, you'll undercharge — a 40% markup only produces about a 28.6% margin. Do that across a whole catalogue and the shortfall adds up fast.
To convert markup to margin, divide the markup by (1 + markup). To go the other way, divide the margin by (1 − margin). When in doubt, decide the margin you need first, since that's what actually determines your profit.
Frequently asked questions
▶Is margin or markup better?
Neither is 'better' — they answer different questions. Markup helps you set a price from a cost; margin tells you what share of each sale is profit. Just be clear which one you're quoting.
▶How do I convert markup to margin?
Divide the markup (as a decimal) by one plus the markup. A 50% markup becomes 0.5 ÷ 1.5 = 0.333, or a 33.3% margin.