Quick answer:
Markup is profit measured against what an item cost you; margin is the same profit measured against what you sold it for. The same dollar of profit always produces a markup percentage higher than the margin percentage, because the denominator changes while the numerator stays the same.
A 50 percent markup is a 33.3 percent margin. A 100 percent markup is a 50 percent margin. Confusing the two when you set prices or read a report means you are planning on profit that never arrives.
Every retailer works with both numbers, often without realizing it. Buyers and merchandisers think in markup because they start from a wholesale cost and build a retail price upward. Accountants and income statements think in margin because profit is always expressed as a share of revenue.
The gap between the two is not a rounding error. It is the difference between hitting your plan and running short on every unit sold. Here is how both percentages are built, a worked example that shows the arithmetic on one lamp, a conversion table you can keep, and the reason a discount always hurts more than the sticker suggests.
What is Markup vs Margin? The Basics
Markup and margin describe the same dollar of profit. The difference is entirely in what you divide that profit by.
Markup is profit divided by cost. It answers the question, “How much did you make on what you paid?” A buyer who pays $12 for a lamp and sells it for $20 has made $8 of profit on a cost of $12. That is an 66.7 percent markup.
Margin is profit divided by selling price. It answers the question, “How much of the sale price did you keep?” The same lamp, same $8 profit, same $20 price produces a 40 percent margin. The profit did not change. The denominator did.
Because cost is always smaller than price, the markup percentage is always larger than the margin percentage for the same item. The two numbers converge only when profit is zero, and they diverge further as profit grows.
The Two Formulas
The core arithmetic is two divisions, and the only thing that swaps is the bottom number.
- Markup = Profit / Cost
- Margin = Profit / Selling Price
Profit is always selling price minus cost. Both formulas use that same profit figure. The result changes because cost and selling price are different numbers.
Converting between the two is straightforward once you accept that the relationship is fixed by the arithmetic.
- To convert markup to margin: Margin = Markup / (1 + Markup)
- To convert margin to markup: Markup = Margin / (1 minus Margin)
Run a 50 percent markup through the first formula: 0.50 / 1.50 = 0.333, or 33.3 percent margin. Run a 40 percent margin through the second: 0.40 / 0.60 = 0.667, or 66.7 percent markup. The two are locked together, and neither can move without the other.
Margin is the figure that appears on an income statement, because gross profit is always expressed against revenue. Markup is the figure buyers and merchandisers use when setting a retail price from a wholesale cost, because cost is the number they start from.
A Worked Example With One Lamp
A gift shop buys a lamp for $12 including freight and sells it for $20. Profit is $20 minus $12, which is $8.
Markup is profit divided by cost: $8 / $12 = 66.7 percent. Margin is profit divided by selling price: $8 / $20 = 40 percent. Same lamp, same $8, two very different percentages. Neither is wrong. They are simply answering different questions.
Now discount the lamp by 10 percent. The price moves from $20 to $18. Cost is still $12, so profit becomes $18 minus $12, which is $6. Profit fell from $8 to $6, a 25 percent cut in profit. The price fell only 10 percent, but the discount came entirely out of the profit portion, not out of the cost.
Margin falls from 40 percent to 33.3 percent. A 10 percent price cut removed a sixth of the margin percentage and a quarter of the dollar profit. That is why small discounts move margin so much: the discount is applied to the whole price, but it is subtracted only from the profit slice.
The takeaway is not that discounting is bad. It is that a 10 percent discount is never a 10 percent hit. The arithmetic demands a larger profit sacrifice than the sticker suggests, and a markdown plan built on markup maths instead of margin maths will systematically underestimate the cost of every promotion.
A Conversion Table You Can Keep
These five conversions cover the range most independent retailers work inside. Keystone pricing, the retail shorthand for doubling cost, sits in the middle.
| Markup | Margin | What it means |
|---|---|---|
| 25% | 20% | Cost plus a quarter; one-fifth of the price is profit. |
| 50% | 33.3% | Cost plus half; one-third of the price is profit. |
| 66.7% | 40% | The lamp example; a common specialty retail target. |
| 100% | 50% | Keystone: double the cost, keep half the price. |
| 150% | 60% | Cost plus one and a half; a high initial markup. |
Notice the pattern. As markup climbs, margin climbs too, but it climbs more slowly. The gap between the two widens with every step. A 25 percent markup misses a 20 percent margin by only 5 percentage points. A 150 percent markup misses a 60 percent margin by 90 percentage points. The higher the markup, the more dangerous the confusion.
Why the Difference Matters for Retailers
The confusion costs real money. Pricing a product with a 40 percent markup when the business plan assumed a 40 percent margin leaves the store short on every unit. A 40 percent markup is a 28.6 percent margin. On a $50 item, that is $5.70 of missing profit per sale. Across a thousand units, the gap is $5,700 that was in the spreadsheet and never arrived at the bank.
The error usually happens at the handoff between buying and finance. A buyer works from cost and sets a retail using a markup target. The modern POS system reports margin against revenue. If nobody checked whether the two percentages refer to the same base, the plan and the result will never match.
Margin calculations are only as good as the cost they use. Freight in and duty need to sit inside the cost figure before any percentage is applied. A buyer who marks up a $10 unit cost while ignoring $2 of freight is working from the wrong base, and both the markup and the margin will be overstated. The error compounds when the same incomplete cost flows into cost of goods sold and distorts the gross profit line on the income statement.
Keystone pricing, doubling cost to reach a 100 percent markup and a 50 percent margin, is the most common retail pricing rule because it is simple to apply at a buying appointment. It also embeds the conversion automatically: a buyer who keystones never has to calculate, because the relationship is fixed. The risk is that keystone becomes a habit rather than a strategy, and items that could carry a higher margin are left underpriced because the arithmetic was easy.
How Discounts and Promotions Change the Number
Discounting hits margin faster than most people expect because the discount comes entirely out of the profit portion of the price, not out of the cost. The lamp example showed a 10 percent price cut producing a 25 percent profit cut. That ratio holds across most retail price points: the profit hit is always larger than the discount percentage, and the higher the initial margin, the larger the multiplier.
A markdown plan built on markup maths will systematically understate the cost of a sale. If you plan a 20 percent off promotion and model the profit impact as 20 percent less profit, you will be wrong by a wide margin. The correct calculation starts from the margin percentage, subtracts the discount from the price, and recalculates profit on the new, lower price. The difference between the old profit and the new profit is the true cost of the promotion.
The discipline is to run every promotion through a margin calculation before it goes live. A inventory management system that tracks cost at the SKU level makes this a thirty-second check rather than a spreadsheet exercise. Without it, the promotion runs blind, and the first time you see the margin impact is on the month-end income statement, when it is too late to adjust.
Where Your POS Reports One and You Assume the Other
Most POS reports show margin, not markup. The sales summary, the category performance report and the end-of-day dashboard all express profit as a percentage of revenue. That is margin. If you have been reading those numbers and calling them markup, you have been looking at a smaller percentage than the one you used to set the price, and the gap is the conversion difference described above.
Freight missing from cost is the most common distortion. A retailer who pays $10 for a unit and $2 to get it delivered has a true cost of $12. If the POS holds $10 as the cost, the reported margin on a $20 sale is 50 percent. The true margin is 40 percent. The difference is 10 percentage points of margin that exist only in the software, and the cash will never match the report.
Check whether your system can hold a landed cost at all before trusting its margin report: free inventory management software often tracks units well and cost badly. The fix is procedural, not technical. Every item’s cost in the system should be the landed cost: what it cost to put the item on the shelf, not what the supplier’s invoice said. Methods of inventory valuation matter here too, because the way you cost your stock flows directly into the margin calculation. Get the cost wrong at intake, and every margin figure downstream is wrong with it.
When the POS reports margin and the buyer thinks in markup, the conversation between the two sides of the business breaks down. The buyer says a line is running at 66.7 percent. The report says 40 percent. Both describe the same dollars, so pick margin as the common language, since it is the one the tax return uses, and convert everything else to match.
Related Terms
These entries cover the costs, metrics and pricing approaches that sit alongside markup and margin in daily retail arithmetic:
