Margin and markup are two ways of describing the same gap between what something costs you and what you sell it for. They use the same two numbers, yet they produce different percentages, and confusing them is one of the most common and expensive mistakes in small-business pricing. A shop that thinks it is earning a 50% margin while actually applying a 50% markup is quietly making far less than it believes.
The distinction is not academic. Price a product with the wrong one and every single sale is mispriced, so the error scales with your volume. This guide explains what each term measures, why the same profit gives two different percentages, how to convert between them, and where the confusion does real damage.
What each term measures
Markup is profit expressed as a percentage of cost. If an item costs you $40 and you add $20 of profit, that $20 is 50% of the $40 cost, so the markup is 50%. Markup answers the question: how much did I add on top of what I paid?
Margin is the same profit expressed as a percentage of the selling price. That $20 profit on a $60 price is 33% of the price, so the margin is 33%. Margin answers a different question: of the money that came in, how much did I keep? Same dollars, same sale, two different percentages, because they are measured against two different bases.
markup = profit ÷ cost margin = profit ÷ priceWhy the same profit gives two numbers
The gap comes entirely from the denominator. Cost is always smaller than price, so dividing the same profit by cost gives a bigger percentage than dividing it by price. Markup is therefore always the larger of the two figures for the same sale, and the gap widens as the profit grows.
This is why a healthy-sounding markup can hide a thinner margin than you expect. A 100% markup, doubling your cost, is only a 50% margin. Once you see that the two are measured against different bases, the mismatch stops being mysterious and becomes something you can simply convert.
Converting between them
You do not have to choose one and abandon the other; they convert cleanly. To turn a markup into a margin, divide the markup by one plus the markup. A 50% markup becomes 0.5 ÷ 1.5, or about 33% margin. To go the other way, divide the margin by one minus the margin: a 33% margin becomes 0.33 ÷ 0.67, or roughly 50% markup.
In practice, most businesses set prices using markup because they start from a known cost, but they judge the health of the business using margin, because margin is what the accounts and investors care about. Being fluent in both, and able to convert on the spot, is what keeps pricing decisions honest.
- 50% markup = 33% margin
- 100% markup = 50% margin
- 25% margin = 33% markup
- 40% margin = 67% markup
A worked example
A shop buys mugs for $4 each and wants what it calls a 60% margin. If it mistakenly applies a 60% markup instead, it prices each mug at $6.40, keeping $2.40 of profit. But $2.40 on a $6.40 price is only a 37.5% margin, well short of the 60% it intended.
To actually hit a 60% margin, the price needs to be $10, because the $6 of profit has to be 60% of the selling price, not 60% of the cost. On a single mug the $3.60 difference looks minor; across thousands of units it is the difference between a comfortable business and one wondering where its money went.
Where the confusion does real damage
The mistake is most dangerous when margins are already thin. In a business running on a 10% margin, treating markup and margin as interchangeable can wipe out the profit on every sale, because the gap between the two percentages is larger than the margin itself.
It also distorts comparisons. If one supplier quotes markup and another quotes margin, comparing the raw numbers makes the markup look more generous than it is. Convert both to the same measure, margin is usually the fairer basis, before deciding which deal is actually better.
Markup is profit over cost; margin is profit over price. Markup is always the bigger number for the same sale, and mixing them up mis-prices every unit you sell. Set prices however you like, but always check the resulting margin, and convert between the two rather than assuming they are the same.
Frequently asked questions
Which should I use to set prices?
Either works, as long as you are consistent. Many businesses price using markup because they start from a known cost, then check the resulting margin to confirm the sale is as profitable as intended. The calculator shows both at once so nothing is left to assumption.
Why is markup always higher than margin?
Because markup divides profit by the smaller number, cost, while margin divides the same profit by the larger number, the selling price. Dividing by a smaller base always yields a larger percentage.
Can margin ever exceed 100%?
No. Margin is profit as a share of price, so it approaches but never reaches 100%. Markup, measured against cost, has no upper limit and can run into the hundreds of percent for high-value goods.