Margin and markup describe the exact same dollar of profit, yet they produce different percentages — and mixing them up is one of the most common, and most expensive, mistakes in small-business pricing. A shop that thinks it’s earning a 40% margin when it’s really using a 40% markup is quietly leaving money on the table with every sale.
The difference is entirely about the denominator. Both start from the same profit — price minus cost — but margin divides that profit by the selling price, while markup divides it by the cost. Same numerator, different base, different number.
The two formulas
- Margin= profit ÷ price. It answers: of each dollar a customer pays me, how much do I keep?
- Markup= profit ÷ cost. It answers: how much did I add on top of what the item cost me?
Because price is always larger than cost, the margin percentage is always the smaller of the two for a profitable item. That gap is the whole source of confusion.
A worked example
Suppose a product costs you $60 and you sell it for $100. Your profit is $40 either way. Now split that $40 two ways:
- Margin = $40 ÷ $100 = 40%. Forty cents of every sales dollar is profit.
- Markup = $40 ÷ $60 = 66.7%. You added two-thirds of the cost on top to reach the price.
Both statements are true about the identical transaction. The item has a 40% margin and a 66.7% markup at the same time.
Why confusing them mis-prices products
Imagine you want a 40% margin but you apply 40% as a markup instead. On that $60 item you’d price it at $60 × 1.40 = $84. But $84 gives you a margin of only $24 ÷ $84 = 28.6%, not the 40% you intended. You just underpriced the product by $16 and shorted your own margin by more than eleven points.
Markup and margin are two views of one profit. Decide which one your target is stated in before you ever touch a price tag.
To convert cleanly: if you want a target margin, price = cost ÷ (1 − margin). For a 40% margin on a $60 cost, that’s $60 ÷ 0.60 = $100 — matching our example exactly. Going the other way, markup = margin ÷ (1 − margin), so a 40% margin equals a 66.7% markup.
Which one to use
Neither is “correct” — they just serve different jobs. Retailers and buyers often think in markup because they start from a wholesale cost and add to it. Accountants and investors think in margin because it maps directly to the income statement and lets you compare profitability across products and companies of any size.
- Use markupwhen you’re setting a price up from a known cost.
- Use marginwhen you’re measuring how profitable a sale or a business actually is.
- Always label the number. “40%” alone is ambiguous; “40% margin” is not.