Markup vs. Margin: What's the Difference?
Both percentages describe the same dollar of profit. They divide it by different numbers, which is why a 50% markup is not a 50% margin.
Markup is measured against your cost
Markup is the amount you add on top of what an item cost you, expressed as a percentage of that cost. If a jar of candles costs you $10 to make and you sell it for $15, you added $5 to a $10 cost, so the markup is 50%.
The formula is (price − cost) ÷ cost. Markup answers a practical question: starting from a cost I already know, how much do I add? That's why suppliers, wholesalers and trades quote in markup — cost is the number in front of them.
Margin is measured against your price
Profit margin is the share of the selling price you keep after the cost of the thing you sold. Same candle: $5 of profit on a $15 price is a 33.3% margin.
The formula is (price − cost) ÷ price. Margin answers a different question: out of every dollar a customer hands me, how much stays with the business? That makes it the number to use when you compare products, judge whether a price is healthy, or check whether your gross profit can cover rent, software and your own pay.
Why the percentages are not interchangeable
Both use the same numerator — the profit in dollars. They differ in the denominator. Price is always larger than cost on a profitable sale, so dividing by price always produces the smaller percentage. Margin is always lower than markup on the same sale.
The gap widens as prices rise. A 20% markup is a 16.7% margin — close enough to ignore by accident. A 100% markup is a 50% margin. A 150% markup is a 60% margin. Markup has no ceiling; margin can never reach 100%, because that would require a cost of zero.
The expensive mistake is treating a target margin as a markup. If you need a 40% margin and you add 40% to cost, you land at a 28.6% margin — you have quietly given away almost a third of the profit you planned for, on every single unit.
A simple example
Say a product costs you $60 and you want to keep 40% of the selling price.
- Wrong (40% markup): $60 × 1.40 = $84 price. Profit is $24, and $24 ÷ $84 = a 28.6% margin.
- Right (40% margin): divide by (1 − 0.40). $60 ÷ 0.60 = $100 price. Profit is $40, and $40 ÷ $100 = the 40% margin you wanted.
That's a $16 difference per unit. At 500 units a year it's $8,000 — the same product, the same costs, one percentage misread.
Enter a cost and price, or a target margin or markup, and see all three numbers side by side so you never have to convert by hand.
When each measurement is useful
Use markup when you're building a price up from a known cost, negotiating with a supplier, or working in a trade where everyone quotes that way. It's the faster mental math at the quoting stage.
Use margin when you're reviewing the business: comparing product lines, deciding whether a discount is survivable, or checking whether revenue can cover overhead. Financial statements are written in margins, so margin is the language for decisions about whether the business works.
One habit avoids most confusion: pick margin as the target you commit to, and treat markup purely as the arithmetic you use to reach it. Write the target margin down, then convert.
If your costs themselves are unclear — materials, packaging, transaction fees, a slice of overhead — settle those first with the Product Pricing Calculator, then come back and set the margin. A perfect percentage applied to an incomplete cost is still the wrong price.
This guide is general educational information, not financial, tax, accounting or legal advice. Examples use fictional numbers. Your own costs, taxes and market conditions differ, so check important decisions with a qualified professional.