Markup vs Margin

Markup and margin both start from the same two numbers—cost and selling price—and they are not the same ratio. Confusing them is one of the most common pricing mistakes in catalogs, wholesale quotes, and “we need 40% to run ads” conversations.

Markup = (selling price − cost) / cost
Margin = (selling price − cost) / selling price

The markup calculator and profit margin calculator keep the arithmetic honest. For a target either way, use the selling price calculator.

If you need the full stack (fees, shipping, net), read E-Commerce Profit Margin Explained after this. This article is the conversion trap.

The pricing mistake

Someone says “I need 50%.” They price at cost × 1.50 (markup). The P&L shows 33% margin. Ads were bid as if 50 points of the ticket were available. Contribution was never 50%.

Worked numbers (illustrative):

• Cost: $40
• Price at 50% markup: $60
• Profit: $20
• Margin: 20 / 60 ≈ 33.3%

To hit 50% margin on $40 cost:

• Price = 40 / (1 − 0.50) = $80

Same word in a meeting; $20 difference on the ticket.

Conversion table

For a given markup, margin is markup / (1 + markup). For a given margin, markup is margin / (1 − margin).

Markup	Equivalent margin	Price if cost = $50
25%	20.0%	$62.50
33.3%	25.0%	$66.67
50%	33.3%	$75.00
66.7%	40.0%	$83.33
100%	50.0%	$100.00
150%	60.0%	$125.00

Memorize one row you use often (50% markup ≠ 50% margin) and look up the rest.

Formulas to price from a target

From markup m:
Price = cost × (1 + m)

From margin g:
Price = cost / (1 − g)

Cost must be the same definition both times—ideally landed COGS, not the factory line. If you still need to cover payments and freight, you are no longer in gross margin; you are in contribution. Either raise the target margin or add those costs into “cost” explicitly so the formula still works.

Where this bites operators

• Marketplace parity. Matching a mall price built on a different fee stack while using markup-from-factory.
• Wholesale to D2C. A 30% wholesale markup is not a 30% D2C margin after photos, ads, and returns.
• Team language. Buyers, marketers, and finance each have a favorite word. Write “40% gross margin” or “1.4× cost” on the SKU sheet.

Before launch, this belongs on the checklist in What You Need Before You Open an Online Store and the start an online store guide.

Discounts, bundles, and “I still have 40%”

A 20% off coupon does not leave “most of the margin.” Margin is a share of the new selling price.

Illustrative: cost $40, ticket $80, margin 50%. After 20% off, ticket is $64. Profit is $24. New margin = 24/64 = 37.5%, not 30% (which would be “50 minus 20”). People subtract percentage points as if they were the same unit as the discount. They are not.

Bundles have the same trap. Two units at 40% margin each, sold as “buy both save 15%,” need a new landed cost (two COGS) and a new ticket. If the bundle is designed from markup-on-cost while the site reports margin, the sheet and the storefront will disagree on whether the promo is allowed.

Sitewide sales should be checked against contribution, not gross: payments, shipping, and expected returns still sit on the discounted ticket. That is the same stack as E-Commerce Profit Margin Explained.

A SKU sheet that prevents the mix-up

Keep four cells per SKU, named in full:

1. Landed cost (currency, inclusive of inbound).
2. List price (tax-exclusive or inclusive—pick one and label it).
3. Markup = (2 − 1) / 1, formatted as %.
4. Gross margin = (2 − 1) / 2, formatted as %.

Add a fifth later: contribution margin after fees and freight. Never overwrite (4) with (5). When someone says “we need 40%,” they point at column 3 or 4 before anyone builds an ad set.

Wholesale quotes should show multiplier on cost (markup) because that is how the buyer thinks. Your D2C ads doc should show margin on price. Translating once in the sheet is cheaper than translating in Slack during a sale.

Ads and break-even

Break-even ROAS is 1 / contribution margin. If you plug in markup by mistake—using 0.50 when you meant 50% markup, which is 33% margin—you will set a 2× ROAS floor that the P&L cannot support. The campaign will look “above target” while contribution after ads is negative.

Worked path: landed $24, list $48 (100% markup, 50% gross). After $4 shipping absorbed and $1.20 payments, contribution is $18.80 / $48 ≈ 39%. Break-even ROAS ≈ 2.6 on a simple incremental model—not 2.0 from the 50% gross, and not 1.0 from thinking “we doubled cost so ads can take the rest.”

A working rule

On any price or bid document, use margin when the denominator is the customer’s price (ads, contribution, category reports). Use markup when you are adding a multiplier to a supplier cost in a buying meeting. If both appear, show the conversion once.

Do not guarantee that a margin target will cover ROAS until variable channel costs are in the model. Markup vs margin is only the first translation.