The denominator is the whole difference
Markup divides profit by cost, while margin divides the same profit by selling price.
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Convert markup percentage on cost into gross margin percentage on selling price.
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Convert markup percentage on cost into gross margin percentage on selling price. The numbers differ because markup and margin use different denominators.
20%.50% markup does not mean 50% gross margin. It converts to about 33.33% margin.
Markup divides profit by cost, while margin divides the same profit by selling price.
With cost 100 and price 150, markup is 50% while margin is 33.33%.
Selling below cost produces negative profit and therefore negative gross margin.
To convert a target margin back to markup, use margin ÷ (100 − margin) × 100.
Related references: SI prefixes & units · Number formats · Cooking measures