Free Operational Inventory Tool
Reorder Point & Safety Stock Calculator
Calculate the exact inventory threshold that should trigger a replenishment purchase order. Incorporates lead time demand and demand variability with mathematical precision.
Inventory Parameters
25 units/day
14 days
±6 units
Measures demand fluctuation. Higher fluctuation requires larger safety stock.Calculated Reorder Point (ROP)
387units
Trigger a supplier replenishment purchase order whenever stock drops to or below this count.
Lead Time Demand
350
25 units × 14 days
Safety Stock Buffer
+37
Z (1.65) × σ (6) × √14
Formula Used:
ROP = (Daily Demand × Lead Time) + (Z × σ × √Lead Time)
ROP = 350 + 37 = 387 units
Official Excel System
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Inventory & Reorder Tracking Workbook (.xlsx)
Stock on hand from one IN/OUT/ADJUST log, safety stock and reorder point alerts, stock value and a supplier directory with lead times.
100% Macro-Free (.xlsx) • Native dynamic formulas
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Pre-filled demo workbook + Clean blank sheet
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