A deterministic reorder trigger using average demand and explicit safety stock. It does not calculate a probabilistic service level or guarantee against stockouts.
Planning estimate only. Platform fees, taxes, payment costs, and policies can change; verify current terms before pricing.
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How this calculator works
Formula
Lead-time demand = average daily sales × supplier lead-time days. Reorder point = lead-time demand + entered safety stock. The order-now signal activates when current stock is at or below that point.
Worked example
10 units per day, seven lead-time days, and 20 safety-stock units produce a 90-unit reorder point. At 80 units on hand, the trigger is active.
Assumptions to verify
- Average daily demand and supplier lead time remain constant.
- Safety stock is entered explicitly rather than inferred from a service level.
- Open purchase orders, seasonality, minimum order quantities, spoilage, backorders, and multi-location inventory are excluded.
Frequently asked questions
What is the reorder point?
Expected lead-time demand plus the safety stock you enter.
Does this guarantee no stockouts?
No. It does not estimate demand distributions or probabilistic service levels.
Should open purchase orders be included?
This simple model does not track them; adjust current stock or use an inventory system that includes inbound units.
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