Free inventory replenishment tool
Inventory Reorder Point Calculator
Calculate the stock level that should trigger a replenishment order, how many days remain before that point, and a practical quantity to reorder.
Simple calculator
Updates liveEnter the replenishment cycle
Demand & supplier timing
Current inventory
Reorder quantity target
Core reorder logicReorder point = lead-time demand + safety stock. Inventory position = on hand + on order − backorders. Suggested reorder quantity raises inventory position toward lead-time demand + order-cycle demand + safety stock.
Advanced calculator
Safety stock + EOQModel uncertainty and supplier constraints
Demand
Supplier lead time
Inventory position
Order quantity economics
Supplier constraints
Advanced safety stockWith demand and lead-time variability, safety stock is estimated as z × √(lead time × demand variance + average daily demand² × lead-time variance). The calculated reorder point is average lead-time demand + safety stock.
Reorder bridge
Current assumptionsFrom demand to reorder point
| Component | Calculation | Units | Share of reorder point |
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Service-level sensitivity
Demand and lead-time variability held constantReorder point at different stockout protection levels
| Service level | Z factor | Safety stock | Reorder point | Extra stock vs 90% | Inventory value tied up in safety stock |
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Lead-time sensitivity
Service level held constantImpact of slower supplier delivery
| Average lead time | Lead-time demand | Safety stock | Reorder point | Days until reorder |
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Order-size comparison
Current inventory positionTarget coverage vs EOQ vs supplier constraints
| Method | Raw quantity | After MOQ / case pack | Post-order inventory position | Post-order days of supply | Order value |
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