How to use this calculator
Enter observed or planned daily demand, lead time, safety stock, and inventory position.
Formula and method
Reorder point = daily demand × lead time + safety stock. Days until trigger = max(0, (inventory position − reorder point) / daily demand).
Worked example
20 units/day, 7 days, 30 safety units gives 170 units; position 250 gives 4 days.
Assumptions and supported scope
A constant-demand planning estimate. Lead time and safety stock are user assumptions; no calendar date or service guarantee.
Method references
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