ReorderStock Studio — Free Interactive In-Browser Studio
Multi-SKU Velocity, On-Hand Stock & Supplier Lead-Time Input (CSV / TSV)
Statistical Safety Stock, Reorder Point (ROP) & Days-Until-PO Alert Schedule
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Supports CSV, JSON, TXT, XML & Log Streams
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Quick Reference & Frequently Asked Questions
What is the exact formula for Reorder Point (ROP) with Safety Stock?
Reorder Point (ROP) equals (Average Daily Unit Sales × Average Lead Time in Days) + Statistical Safety Stock. When your available inventory (On-Hand + On-Order) drops to the ROP, you must place a new Purchase Order immediately.
How do you calculate Safety Stock when both demand and supplier lead time vary?
Using King's statistical equation: Safety Stock = Z × sqrt((Average Lead Time × Demand Standard Deviation²) + (Average Daily Sales × Lead-Time Standard Deviation)²), where Z is your service-level factor (1.65 for 95%, 2.33 for 99%).
What Z-score service level should Amazon FBA and Shopify sellers use?
Most sellers apply a 98%–99% service level (Z = 2.05 to 2.33) to their top 20% hero SKUs where stockouts destroy organic ranking, and a 90%–95% service level (Z = 1.28 to 1.65) to slower-moving catalog SKUs.
Should Amazon FBA receiving time be included in supplier lead time?
Yes. Total replenishment lead time must include factory production days + ocean/air transit + customs clearance + Amazon FC check-in and receiving transfer days (typically 10–18 extra days).