Retail math · By category
Productivity Formulas for Apparel Brands
Productivity formulas — GMROI, inventory turns, sell-through, and plan variance — that measure how well inventory dollars are working.
5 productivity formulas
Analytics
Sell-Through Rate
Sell-Through % = Units Sold ÷ Units Received × 100
Executive
Gross Margin Return on Investment (GMROI)
GMROI = Gross Margin $ ÷ Average Inventory at Cost
Supply Chain / Ops
Inventory Turns
Turns = COGS ÷ Average Inventory at Cost
Planner
Plan vs Actual Variance %
Variance % = (Actual − Plan) ÷ Plan × 100
Executive
Working Capital Tied in Inventory
Working Capital = Average Inventory at Cost × (Days Held ÷ 365)
Other categories
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RetailNorthstar runs these formulas live inside a connected apparel planning workflow — OTB through allocation, by department, class, and style.