Profit Margin vs Markup: What's the Difference?

Margin and markup both describe the gap between what something costs and what it sells for. They are not the same number, and treating them as interchangeable is one of the most common — and most expensive — pricing mistakes in small business.

The difference comes down to the base. Margin measures profit against the selling price. Markup measures profit against the cost.

A single sale, two percentages

Suppose you buy an item for 150 and sell it for 250. The profit is 100 either way.

• As a margin, that 100 is 40% of the 250 selling price.
• As a markup, the same 100 is 66.67% of the 150 cost.

Both statements are true. They describe the same 100 from opposite ends of the transaction. The confusion starts when a supplier, a price list or a colleague quotes one and you assume the other.

Why the distinction matters

If you want a 40% margin and you add 40% to your cost, you will be short. Adding 40% to 150 gives 210, which is a 28.6% margin — not 40%.

To price for a target margin, divide cost by one minus the margin as a decimal:

Selling price = Cost ÷ (1 − Margin)

For a 40% margin on a cost of 150: 150 ÷ 0.60 = 250.

To price for a target markup, multiply cost by one plus the markup:

Selling price = Cost × (1 + Markup)

For a 50% markup on the same cost: 150 × 1.50 = 225.

The gap between 225 and 250 is the cost of the confusion, multiplied across every unit you sell.

Converting between the two

Convert markup to margin by dividing the markup percentage by 100 plus the markup percentage, then multiplying by 100.

• 25% markup = 25 ÷ 125 × 100 = 20% margin
• 50% markup = 50 ÷ 150 × 100 = 33.33% margin
• 100% markup = 100 ÷ 200 × 100 = 50% margin

Convert margin to markup by dividing the margin percentage by 100 minus the margin percentage.

• 20% margin = 20 ÷ 80 × 100 = 25% markup
• 40% margin = 40 ÷ 60 × 100 = 66.67% markup
• 50% margin = 50 ÷ 50 × 100 = 100% markup

Notice that markup is always the larger number for a profitable sale. If someone quotes a markup that looks lower than the margin you expected, check which base they used before agreeing a price.

Which one should you use?

Use margin when you are judging profitability. It tells you what proportion of revenue survives after the cost of the sale, which is what pays rent, salaries and tax. It is the right number for comparing products with different prices, and the number lenders and buyers usually care about.

Use markup when you are setting a price from a known cost. It is simpler arithmetic and matches how many suppliers and retailers think about stock.

The practical answer is to use both: set the price with markup if that is natural to your trade, then check the resulting margin before committing. Our markup calculator shows both figures side by side for exactly this reason.

The trap of discounting

Margin is also the number that reveals how dangerous a discount can be. A 20% discount on a product with a 40% margin does not reduce profit by 20%. It cuts the selling price from 250 to 200, leaving 50 of profit instead of 100 — a 50% reduction in profit.

The lower the margin, the more a discount hurts. At a 20% margin, a 20% discount removes the entire profit and turns the sale into a loss. Before running a promotion, put the discounted price back through the profit margin calculator and see what survives.

Common mistakes

• Adding margin to cost. A 30% margin is not cost plus 30%. It is cost ÷ 0.70.
• Reporting markup as margin. It overstates profitability, sometimes by half.
• Calculating on tax-inclusive revenue. Sales tax is not yours. Use net figures.
• Leaving out delivery and fees. They belong in cost and reduce the true margin.
• Assuming one target works for every product. Stock turnover, wastage and support costs differ.

A quick working rule

For a healthy small business, aim to know both numbers for every significant product or service. If a product carries a 50% markup, know that it produces a 33.3% margin before you decide whether that is enough to cover your overheads.

If you take one habit from this article, make it this: whenever a percentage is quoted, ask "percentage of what?" The answer changes the price.