Allocate the annual carrying cost of safety inventory across outbound shipments. Enter the value of the buffer stock, your annual holding-rate assumption, shipment volume, and any buffer-specific handling expense to see the cost burden per shipment without mixing it with ordinary cycle-stock cost.
The result spreads the cost of maintaining the safety buffer over each outbound shipment. It is most useful for comparing buffer policies at the same shipment volume.
The carrying rate is an input because financing, warehousing, insurance, shrinkage, and obsolescence costs vary by operation. Do not add costs already included in that rate twice.
Holding 600 safety units at $25 each creates $15,000 of buffer inventory. At a 22% annual carrying rate, carrying cost is $3,300 per year. Across 2,400 shipments plus $0.75 handling each, the cost is $2.13 per shipment.
Include the inventory costs your organization treats as carrying cost, such as capital, storage, insurance, shrinkage, and obsolescence.
No. Unit cost establishes the buffer value; only its annual carrying cost is allocated here.
Use the expected annual outbound shipment count that corresponds to the same annual carrying-rate period.
Yes. Enter zero when buffer-specific handling is already included elsewhere or cannot be separated.
The same annual carrying cost is spread across more shipments, although total buffer cost itself does not change.
| Input | Unit | Role |
|---|---|---|
| Safety inventory units | units | Average units intentionally held as buffer stock. |
| Cost per unit | USD | Inventory acquisition or production cost per unit. |
| Annual carrying rate | % | Your combined capital, storage, insurance, and loss rate. |
| Annual outbound shipments | shipments | Expected shipments during the same one-year period. |
| Buffer-specific handling per shipment | USD | Incremental handling attributable to safety stock, if any. |