Formula
Margin = (Price − Cost) ÷ Price · Markup = (Price − Cost) ÷ Cost
FAQ
Which one do businesses usually quote?
Retail and product teams often speak in markup when setting prices; finance and reporting always use margin. Ask which base someone means before agreeing to a number.
Where do mistakes happen?
Applying a markup percentage when a margin was intended — e.g. 'add 30%' yields a ~23% margin. On large volumes that gap is real money.