They sound interchangeable, and plenty of otherwise-careful business owners use them as if they were. But margin and markup answer different questions — and treating a markup like a margin means every single sale earns less than you intended.
Here's the whole problem in one sentence: margin and markup describe the same gross profit, but they divide it by different things. Margin divides profit by the selling price. Markup divides profit by the cost. Because the price is always bigger than the cost, the markup percentage is always the larger number — and if you mix them up, you systematically underprice.
The two formulas
Start with the one thing they share. Gross profit is just price minus cost:
From there, the two metrics split:
That's the entire distinction. Margin is "what fraction of the price I charged is profit." Markup is "by what fraction did I mark the cost up to get to the price."
A worked example
Say a product costs you $60 to make and you sell it for $100. The gross profit is $40. Now run both metrics:
- Margin = 40 ÷ 100 = 40%. Forty cents of every dollar you collect is profit.
- Markup = 40 ÷ 60 = 66.7%. You marked the $60 cost up by two-thirds to reach $100.
Same product, same $40 profit, two very different percentages. Neither is wrong — they're just measuring against different bases.
The expensive mistake: deciding you want a "40% margin," then marking your cost up by 40%. That gives you a 28.6% margin, not 40%.
Watch how that goes wrong. You want a 40% margin, so you take your $60 cost and add 40%: $60 × 1.40 = $84. But check the actual margin on that $84 price: profit is $24, and 24 ÷ 84 = 28.6%. You aimed for 40% and quietly landed at 28.6% — on every unit, forever, until someone notices.
How to get the price right
If you think in margin (most founders and finance people do, because it ties directly to the income statement), the formula to find your price is:
For a 40% margin on a $60 cost: 60 ÷ (1 − 0.40) = 60 ÷ 0.60 = $100. That's the price that genuinely yields 40%.
If you think in markup (common in retail and trades, where you mark up wholesale cost), it's simpler:
Converting between the two
You can always translate one into the other:
So a 50% markup is a 33.3% margin, and a 50% margin is a 100% markup. A few common pairs:
| Markup | Equivalent margin |
|---|---|
| 15% | 13.0% |
| 25% | 20.0% |
| 50% | 33.3% |
| 100% | 50.0% |
| 200% | 66.7% |
Why this matters beyond pricing one product
The margin-vs-markup slip compounds. If you set prices across a whole catalog by "adding X%," you've baked a lower-than-intended margin into every line — and your blended gross margin comes in below plan. That shortfall flows straight to the bottom line, because gross margin is the pool that has to cover rent, salaries, marketing, and everything else before you see a cent of net profit.
It also distorts comparisons. A vendor boasting a "50% markup" and a competitor citing a "50% margin" are not in the same place: the first keeps 33% of revenue as gross profit, the second keeps 50%. Knowing which is which keeps you from overpaying or underbidding.
The one-line takeaway
Margin is profit over price; markup is profit over cost. Pick the lens your business naturally uses, but never set a price by adding a margin percentage to cost — divide cost by (1 − margin) instead. Do that and the number you planned for is the number you actually earn.