Discount vs Markup: What's the Difference and Why It Matters

The Short Answer

• Markup is calculated on the cost price — what you paid for the item.
• Discount is calculated on the selling price — what you charge the customer.
• Margin is also calculated on the selling price, which is why margin and discount percentages look similar but mean different things.

The practical consequence: a 50% markup and a 50% discount on the same item are not opposites. One gives you a 33% margin; the other wipes out your profit entirely.

Markup: Starting from Cost

You buy a product for $40. You want to make a profit.

A 50% markup means you add 50% of the cost to the cost:

Selling price = Cost × (1 + Markup/100)
             = $40 × 1.50
             = $60

Your profit is $20. Your gross margin on that $60 sale is:

Margin = ($20 / $60) × 100 = 33.3%

Note: the markup percentage (50%) is always higher than the resulting margin (33.3%) for the same transaction.

The markup formula

Markup % = ((Selling price − Cost) / Cost) × 100

Discount: Starting from Selling Price

You’re selling that same $60 item. You offer a 20% discount.

Sale price = $60 × (1 − 0.20) = $60 × 0.80 = $48

Your customer saves $12. You receive $48.

Your cost was $40, so your profit is now $8 instead of $20. Your margin has dropped from 33.3% to:

Margin = ($8 / $48) × 100 = 16.7%

A 20% discount cut your profit by 60%.

The discount formula

Discount % = ((Original − Sale) / Original) × 100

The Dangerous Confusion

Here’s where businesses lose money: treating markup and margin as interchangeable.

Scenario: A retailer buys goods for $100 and applies “a 40% margin.” If they calculate it as markup:

• They set the price at $100 × 1.40 = $140
• Their actual margin: ($40 / $140) × 100 = 28.6% — not 40%

They’re underpricing every item in their store.

Markup vs Margin: side-by-side

Converting Between Markup and Margin

Markup → Margin

Margin = Markup / (1 + Markup/100)

Example: 50% markup → 50 / 1.50 = 33.3% margin

Margin → Markup

Markup = Margin / (1 − Margin/100)

Example: 33.3% margin → 33.3 / 0.667 = 50% markup

What Maximum Discount Can You Offer?

If you’ve applied a 50% markup (giving you a 33.3% margin), the maximum discount you can offer before losing money is your gross margin: 33.3%.

Any discount above 33.3% means you’re selling below cost.

Max discount = Gross margin %

Use our discount calculator and markup calculator to check your numbers before setting prices or running promotions.