Markup vs. Margin: The Calculation That Trips Up Every New Business Owner

Markup and margin are both ways of expressing the difference between cost and price. They're calculated differently, and mixing them up leads to systematic under-pricing.

The Definitions

Markup = (Price - Cost) ÷ Cost

A $100 item bought at $60: markup = ($100 - $60) ÷ $60 = 66.7%

Margin = (Price - Cost) ÷ Price

Same item: margin = ($100 - $60) ÷ $100 = 40%

Same $40 profit. Two different percentages. The confusion happens when someone says "I want a 50% margin" but calculates it as markup — and ends up with a 33% margin instead.

The Mistake

You buy something for $50. You want a 50% margin. You add 50% markup: $50 × 1.5 = $75.

Margin check: ($75 - $50) ÷ $75 = 33% margin — not 50%.

To achieve a 50% margin, the formula is:

Price = Cost ÷ (1 - margin %)

$50 ÷ (1 - 0.5) = $50 ÷ 0.5 = $100

Which to Use When

Margin is standard in retail and most business contexts. When someone asks "what's your margin on that?", they expect a margin calculation, not markup.

Markup is common in manufacturing and wholesale, where pricing starts from cost-plus.

If your target is a specific gross margin (which most financial models use), work with margin — not markup.

Keystone Pricing

"Keystone markup" in retail means doubling the wholesale price (100% markup = 50% margin). It's a quick rule of thumb, not a careful pricing strategy — but it's widely used in product retail because it covers typical retail overhead at scale.

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