What is profit margin?

Margin and markup are different numbers from the same two inputs, and confusing them is expensive at scale.

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Profit margin is profit as a share of the selling price: (price − cost) ÷ price. Markup is profit as a share of cost: (price − cost) ÷ cost.

The same product, two numbers

CostPriceMarkupMargin
10.0015.0050%33.3%
10.0020.00100%50%
10.0025.00150%60%
10.0040.00300%75%

Setting “100%” in a pricing rule when you meant a 100% margin produces a price that is half what you intended. Applied to a catalog, that is a bad quarter.

Using it in Shopify

Shopify calculates margin from cost per item, so the reports are only as good as that field. Once cost is accurate, a pricing rule can be expressed once — cost plus a percentage, rounded — and re-applied whenever costs move.

Margin floors during clearance

Successive percentage markdowns compound: three 20% cuts leave you at 51% of the original price. If you have a floor, calculate the final markdown stage from cost rather than from the current price.

Bulk Product Edit by MITS edits this field in bulk across a filtered part of your catalog, with a log and a one-click revert.

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Related reading

Margin-based pricing on Shopify

Price from cost per item to a target margin, per category, with rounding.

Read more

What is cost per item?

What cost per item drives, and why it drifts out of date.

Read more

Margin-based pricing without a spreadsheet

Price from cost, per category, with the markup-versus-margin trap defused.

Read more

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