The number customers never see and every margin report depends on.
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Cost per item is the amount a variant costs you to acquire or produce. Shopify uses it to calculate margin and profit; it is never shown on the storefront.
Cost changes whenever a supplier raises prices, a currency moves or shipping terms change. If nobody updates the field, margin reporting stays confidently wrong — which is worse than having no report at all.
The practical habit is to update cost in the same task that changes price, filtered by vendor, so both numbers move together.
A 100% markup on a cost of 10 gives a price of 20 — a 50% margin. Getting these two confused is the most common mistake in cost-based pricing, and it is easy to make at scale.
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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Push supplier increases into cost per item, then reprice from cost to a target margin.
Read morePrice from cost per item to a target margin, per category, with rounding.
Read moreMargin versus markup, with the table that prevents the expensive mistake.
Read more