Retail math · By role
Retail Math for Allocators in Apparel
Door-level demand, fair-share allocation, replenishment triggers, fill rate, and safety stock — the allocation math that lands product at the right door.
10 formulas for allocators
ProductivityAlso: Analytics
Sell-Through Rate
Sell-Through % = Units Sold ÷ Units Received × 100
InventoryAlso: Planner
Weeks of Supply (WOS)
WOS = On-Hand Units ÷ Average Weekly Unit Sales
InventoryAlso: Planner
Forward Weeks of Supply (FWOS)
FWOS = On-Hand Units ÷ Forecasted Average Weekly Unit Sales
Inventory
Fill Rate
Fill Rate % = Units Shipped ÷ Units Ordered × 100
InventoryAlso: Buyer
Size Curve Allocation
Units per Size = Total Buy × Size % from Curve
Sales
Door-Level Demand Index
Door Index = Door Sales ÷ Average Door Sales
Inventory
Fair-Share Allocation
Door Units = Total Allocation × (Door Demand ÷ Chain Demand)
Inventory
Replenishment Trigger Point
Trigger = (Lead Time in Weeks × Average Weekly Sales) + Safety Stock
Inventory
Safety Stock
Safety Stock = Average Weekly Demand × Safety-Days Coverage ÷ 7
InventoryAlso: Supply Chain / Ops
Inventory Accuracy %
Accuracy % = 1 − |System Count − Physical Count| ÷ System Count
Allocator Cheatsheet
Retail Math Cheatsheet for Allocators
A role-specific PDF with the formulas allocators 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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Allocators 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.