Margin vs Markup: What They Actually Measure

Margin and markup both come from the same two numbers — cost and selling price — and both describe the profit on a sale. The confusion is not in the arithmetic; it is that they divide the same profit figure by two different things, and the results are never the same percentage.

The two formulas

Margin answers "what share of the money I received is profit?" Markup answers "how far above cost did I set the price?" Both are legitimate questions — they just answer different ones, and a business that quotes one while its supplier or investor assumes the other will misread the numbers by a wide margin.

Worked example

An item costs £40 to make and sells for £100. Profit is £60 either way.

The same transaction, two correct numbers that are 90 percentage points apart. The site's own profit margin calculator runs both directions of this — margin from price, and the price needed for a target margin — using the same figures shown here.

The mistake: treating a markup as if it were a margin

This is the single most common pricing error, and it is expensive in a predictable direction: it always makes margin look better than it is. A trader who applies a "50% markup" to a £40 cost prices at £60. They may believe they are running a 50% margin, but the actual margin is (£60 − £40) ÷ £60 = 33.3%. Repeat that error across every product in a catalogue and a business can be running structurally thinner margins than its own pricing sheet suggests.

Notice markup always sits above the equivalent margin, and the gap widens as both numbers grow. At low percentages the difference looks almost cosmetic; at higher percentages — the range retail and hospitality often work in — the gap is tens of percentage points, and mixing them up in a spreadsheet formula silently overstates profitability.

Converting between them

margin = markup ÷ (1 + markup) markup = margin ÷ (1 − margin)

Set markup = 1.50 (150%) in the first formula: 1.50 ÷ 2.50 = 60% margin — matching the worked example above. These two formulas are the fast way to sanity-check a pricing sheet that only states one of the two figures.

Why a discount costs more margin than it looks

Cost stays fixed when you discount; only price moves. That means a discount removes a larger share of margin than its own percentage suggests, because the same absolute cost is now being divided into a smaller number. On the £40/£100 item above (60% margin), a 20% discount drops the price to £80 — and margin falls to (£80 − £40) ÷ £80 = 50%, a 10-percentage-point drop from a 20% discount. Thinner starting margins are hit far harder: a product on a 25% margin (£40 cost, price ≈£53.33) discounted by the same 20% falls to a 6.25% margin — most of the profit is gone, because there was much less of it to begin with.

When businesses use each

• Markup is how prices are usually set — starting from a known cost and adding a percentage on top is a simple, mechanical pricing rule.
• Margin is how profitability is usually reported — investors, lenders and management accounts talk in gross margin because it is a share of revenue, the number that ties directly to the income statement.
• A business that sets prices by markup but is measured on margin needs the conversion formula above, not two separate spreadsheets that quietly disagree.

What this doesn't cover

• Both figures here are gross margin/markup — the direct cost of the item only. Overheads, salaries, rent and marketing are excluded, so a healthy gross margin does not by itself mean the business is profitable overall.
• Neither number accounts for volume. A high margin on very few sales can produce less total profit than a thin margin at scale.
• Sales tax and VAT treatment vary by jurisdiction — confirm whether the cost and price figures you're using are inclusive or exclusive before comparing them.