Retail math · By role
Retail Math for Supply Chain / Opss in Apparel
COGS, inventory accuracy, and inventory turns — the supply chain and operations math that connects planning to the warehouse floor.
9 formulas for supply chain / opss
ProductivityAlso: Executive
Gross Margin Return on Investment (GMROI)
GMROI = Gross Margin $ ÷ Average Inventory at Cost
Productivity
Inventory Turns
Turns = COGS ÷ Average Inventory at Cost
InventoryAlso: Allocator
Fill Rate
Fill Rate % = Units Shipped ÷ Units Ordered × 100
SalesAlso: Buyer
Average Unit Cost (AUC)
AUC = COGS ÷ Units Sold (or Inventory at Cost ÷ Units On Hand)
InventoryAlso: Allocator
Replenishment Trigger Point
Trigger = (Lead Time in Weeks × Average Weekly Sales) + Safety Stock
InventoryAlso: Allocator
Safety Stock
Safety Stock = Average Weekly Demand × Safety-Days Coverage ÷ 7
Margin
Cost of Goods Sold (COGS)
COGS = BOP Inventory + Purchases − EOP Inventory (all at cost)
Inventory
Inventory Accuracy %
Accuracy % = 1 − |System Count − Physical Count| ÷ System Count
ProductivityAlso: Executive
Working Capital Tied in Inventory
Working Capital = Average Inventory at Cost × (Days Held ÷ 365)
Supply Chain / Ops Cheatsheet
Retail Math Cheatsheet for Supply Chain / Opss
A role-specific PDF with the formulas supply chain / opss use day-to-day — equations, worked apparel examples, and the adjacent formulas you work with. Work email only — no sales calls triggered.
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Supply Chain / Opss run this math in RetailNorthstar — live.
One connected system from plan to allocation. No more reconciling the spreadsheet, the BI dashboard, and the buy file against each other.