Calculate gross, operating, and net profit margin from revenue and cost.
Gross profit is revenue minus cost. Margin is profit as a share of revenue (profit ÷ revenue × 100); markup is profit as a share of cost (profit ÷ cost × 100). The same dollar profit gives a smaller margin than markup — e.g. $30 on a $80 sale is a 37.5% margin but a 60% markup.
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