Markup vs Margin: The Math That Loses Money

A 50% markup is not a 50% margin. A 100% markup is a 50% margin. A 25% margin is a 33% markup. These are not interchangeable, and confusing them causes real pricing errors that lose real money. This short article explains the difference, shows the formula, and gives a worked example you can use as a sanity check the next time someone says "we have 50% margins."

The two formulas

Markup is profit expressed as a percentage of cost:

Markup % = (price − cost) ÷ cost × 100

Margin is profit expressed as a percentage of price:

Margin % = (price − cost) ÷ price × 100

Same dollar profit. Different denominator. Because price is always larger than cost, the markup percentage is always larger than the margin percentage for the same transaction.

Worked example: $20 cost, $40 price

Metric	Formula	Value
Profit	$40 − $20	$20
Markup	$20 ÷ $20	100%
Margin	$20 ÷ $40	50%

The same $20 profit looks like 100% if you divide by cost, and 50% if you divide by price. Both are mathematically correct — they just answer different questions.

When to use which

Use markup when:

• Setting prices from a cost basis ("I'll mark this up 100%" = double the cost)
• Negotiating with suppliers ("I need a price that lets me mark up 80%")
• Talking to retail buyers who think in keystone (100% markup)

Use margin when:

• Reporting financial performance to investors or accountants
• Calculating break-even ROAS (margin is the denominator)
• Comparing products with different price points
• Computing profit as a share of revenue

The 50% markup / 50% margin mistake

Here's the most expensive version of this mistake: a new dropshipper decides they want "50% margin" on their product. They take their $20 cost, add 50% (markup), and set the price at $30. Their actual margin is now ($30 − $20) ÷ $30 = 33%, not 50%.

If they'd calculated correctly — using the Selling Price Calculator — they'd know that 50% margin on $20 cost requires a $40 price, not $30. The $10 difference per order, on 100 orders/month, is $1,000/month in lost profit. On a 12-month run, $12,000. From a single math mistake.

The conversion table

Use this table to convert between markup and margin without re-deriving the formula each time:

Markup	Margin	Example
25%	20%	$20 cost → $25 price
50%	33%	$20 cost → $30 price
100% (keystone)	50%	$20 cost → $40 price
150%	60%	$20 cost → $50 price
200%	67%	$20 cost → $60 price
300%	75%	$20 cost → $80 price

The rule of thumb

If you remember one thing from this article: margin is always lower than markup for the same transaction. If someone quotes a percentage and you're not sure which they mean, ask. If you can't ask, assume margin if they're an accountant or investor, assume markup if they're a supplier or retail buyer.

Use the Markup vs Margin Calculator to convert between the two with your own numbers. Or read our deeper article on how to calculate dropshipping profit margin for the full framework.

Written by the Playblog Dropshipping Team. Last reviewed July 19, 2026.