The difference in one line
Markup and margin both describe the gap between what something costs you and what you sell it for. The difference is what you divide that gap by. Markup divides the profit by the cost, so it answers the question, how much did I add on top of cost. Margin divides the same profit by the selling price, so it answers, how much of each sale do I actually keep. Because price is always larger than cost, the margin percentage is always smaller than the markup percentage for the same sale.
In formulas, with profit being price minus cost, markup is profit divided by cost and margin is profit divided by price. Take an item that costs 10 and sells for 15. The profit is 5. The markup is 5 divided by 10, which is 50 percent. The margin is 5 divided by 15, which is 33.3 percent. Same item, same fiver of profit, two different percentages. Mixing them up is the single most common pricing mistake, and it always errs in the same direction: you think you are keeping more than you are.
Why confusing them costs you money
The danger is that markup flatters the number. A shop owner who wants a comfortable 40 percent margin but accidentally adds 40 percent markup ends up with only a 28.6 percent margin, missing the target by more than eleven points. On a product costing 50 that gap is real cash. A 40 percent margin would mean selling at 83.33 and keeping 33.33. A 40 percent markup means selling at 70 and keeping just 20. Across a full inventory, that confusion quietly drains thousands a year.
It also breaks comparisons. Suppliers and trade catalogues sometimes quote in markup and sometimes in margin without saying which, and accounts are almost always reported in margin. If you plan in markup but report in margin, your forecasts will keep coming in worse than expected and you will not immediately see why. Picking one language, ideally margin, and converting everything into it removes that whole class of error.
Markup to margin conversion table
The two are tied together by a fixed relationship, so any markup maps to exactly one margin. The formula is margin = markup / (1 + markup). Here are the conversions worth memorising, since these round numbers come up constantly:
- 15 percent markup is a 13.0 percent margin.
- 25 percent markup is a 20.0 percent margin.
- 33.3 percent markup is a 25.0 percent margin.
- 50 percent markup is a 33.3 percent margin.
- 66.7 percent markup is a 40.0 percent margin.
- 100 percent markup is a 50.0 percent margin (this one is the easiest sanity check: double the cost and you keep half the price).
- 150 percent markup is a 60.0 percent margin.
- 233 percent markup is a 70.0 percent margin.
Notice how the two figures pull apart as they climb. At small percentages they are close, so a 10 percent markup and a 10 percent margin are nearly the same and the error is small. By the time you are doubling your cost, the markup is twice the margin. That is exactly when getting them mixed up does the most damage, because high added value items are usually the ones you most want to price correctly. You can check any pair of numbers with the markup calculator and read the resulting margin straight off.
A worked example in pounds
Say you run a small homeware shop and buy a ceramic lamp for 24 from your wholesaler. You want to understand both views before you set a shelf price. First, suppose you simply double it and sell at 48. The profit is 24, so the markup is 24 divided by 24, which is 100 percent, and the margin is 24 divided by 48, which is 50 percent. That is the clean textbook case: a 100 percent markup is always a 50 percent margin.
Now suppose 48 prices you out of the market and the most you can charge is 40. Your profit drops to 16. The markup is 16 divided by 24, which is 66.7 percent, and the margin is 16 divided by 40, which is 40 percent. So a price cut from 48 to 40, a fall of just under 17 percent on the ticket, knocked ten points off your margin. That sensitivity is why margin is the figure to watch: small movements in price move it sharply, and it is the number your overheads and wages have to be paid from. To test different shelf prices and read the margin each one gives, run the figures through the profit margin calculator.
How to price from a target margin
Most businesses should start from the margin they need, not the markup they fancy, because margin is what keeps the lights on. The pricing formula is short: price = cost / (1 - margin), with the margin written as a decimal. The 1 minus margin part is the share of the price that is cost, so dividing cost by it grosses the figure up to a full price.
Work the lamp again with a target. Your cost is 24 and you want a 35 percent margin. Then price = 24 / (1 - 0.35) = 24 / 0.65 = 36.92. Selling at 36.92 leaves 12.92 of profit, and 12.92 divided by 36.92 is indeed 35 percent. Want 45 percent instead? Price = 24 / 0.55 = 43.64. The method scales to any cost and any margin, which makes it far more reliable than adding a habitual markup and hoping the margin lands somewhere sensible.
A few practical notes. Always base the calculation on your true landed cost, including delivery, packaging and any card or platform fees, or the margin you compute will be rosier than the one you bank. If you sell across channels with different fees, set the price per channel so the margin holds after each one takes its cut. And review your numbers whenever supplier prices move, since a cost rise you do not pass on is a silent margin cut. Decide on the margin first, let the formula set the price, and use markup only as a quick shorthand once you know how the two translate.