Retail margin calculator formula
Subtract unit cost from selling price to get merchandise gross profit, then divide by selling price for gross margin.
Calculate retail gross profit, margin, and markup side by side so the two percentage bases never get mixed.
Gross margin
50.00%$30.00 merchandise gross profit. This is not net profit.TWO PERCENTAGES, TWO BASES
Gross margin compares gross profit with selling price. Markup compares the same dollars with cost. Seeing both prevents a common pricing mistake.

THE FIELD NOTES
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
$30 gross profit · 100% markup on cost
Subtract unit cost from selling price to get merchandise gross profit, then divide by selling price for gross margin.
A 100% markup on a $30 cost creates a $60 price, but that price contains a 50% gross margin.
Merchandise gross profit must still cover marketplace fees, fulfillment, returns, advertising, overhead, taxes, and profit.
This is not net profit and does not infer taxes, discounts, fees, or operating expenses.
THE PRODUCT IS NEXT
Subtract unit cost from selling price to get merchandise gross profit, then divide by selling price for gross margin.
Divide the same gross-profit dollars by unit cost for markup; the denominator is what makes the percentages different.
A 100% markup on a $30 cost creates a $60 price, but that price contains a 50% gross margin.
Never substitute one percentage for the other in a pricing rule.
Merchandise gross profit must still cover marketplace fees, fulfillment, returns, advertising, overhead, taxes, and profit.
Use companion contribution and profit tools when those costs belong in the question.
This is not net profit and does not infer taxes, discounts, fees, or operating expenses.
Keep cost and price in the same currency and unit scope.
Subtract unit cost from selling price, divide by selling price, and multiply by 100.
No. Margin divides gross profit by selling price; markup divides gross profit by cost.
No. Gross margin excludes operating costs, marketplace fees, taxes, financing, and other expenses.
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