How to Calculate Retail Margin
A price can look profitable until cost, tax basis and expected waste are considered. Begin with a consistent unit cost and selling price, then separate margin from markup.
Work out gross profit
Gross profit per unit is selling price minus unit cost. If an item costs $10 and sells for $15 on the same tax basis, gross profit is $5 before rent, wages and other expenses.
Calculate margin and markup
Margin divides the $5 profit by the $15 selling price, giving about 33.33%. Markup divides the same $5 by the $10 cost, giving 50%. The percentages differ because their denominators differ.
- Margin = (selling price − cost) ÷ selling price × 100.
- Markup = (selling price − cost) ÷ cost × 100.
Work backwards from a target
For a target gross margin, divide cost by one minus the target margin expressed as a decimal. A $10 cost and 40% target margin gives about $16.67 before your rounding policy. A 100% margin is not a finite selling price when cost is above zero.
Check the wider decision
A high margin does not guarantee a good result if units spoil or sell slowly. Compare turnover, expected markdowns and waste alongside gross margin. Keep tax treatment consistent and use your accounting advice for formal reports.
Worked example: a markdown changes the margin
A product costs $10 per unit and normally sells for $15, using the same tax basis for both values. Gross profit is $5 and gross margin is $5 divided by $15, about 33.33%. If the store reduces the price to $12, gross profit becomes $2 and gross margin becomes $2 divided by $12, about 16.67%. The $3 discount is 20% of the original $15 price.
This comparison does not include wages, rent, card fees or spoilage. A reduced item can still be useful if it avoids a larger write-off, but the decision needs the actual remaining quantity and likely demand. Enter the same basis for costs and prices in the calculator, and do not call the resulting gross margin a net profit figure.
Use the same tax basis and remember that margin and markup are not interchangeable.
Retail Margin Calculator
Calculate gross profit, markup and margin from cost and selling price, or estimate a price for a target margin.