Replenishment
How should FBA replenishment frequency be estimated?
Replenishment frequency is the result of demand, lead time and safety stock—not a universal weekly or monthly rule.
A basic reorder point is average daily sales multiplied by total lead time, plus safety stock. Replace every parameter with your own operating data.
Prepare the operating data
A replenishment plan needs demand, available stock, in-transit stock and lead-time data—not intuition alone.
- Average daily sales and variation over 7, 30 and 90 days
- FBA available, reserved and inbound quantities
- Warehouse handling, transport and FBA receiving lead time
- Safety stock for promotions, holidays and receiving exceptions
Use a reorder point
For example, with 10 units of daily demand, seven days of total lead time and 30 units of safety stock, the reorder point is 100 units. That triggers a review; it is not automatically the shipment quantity.
- Reorder point = daily demand × total lead time + safety stock
- Target stock = target days of cover × daily demand
- Suggested quantity = target stock − FBA available − valid inbound
- Use separate parameters for launches, promotions and volatile items
Connect to warehouse execution
With buffer stock in Japan, replenishment can be released in batches. Before dispatch, confirm cartons, labels, appointments, in-transit quantities and Amazon receiving conditions.
- Use a fixed review day, not a fixed shipment quantity
- FIFO by inbound batch helps control inventory age
- Verify in-transit stock before releasing another shipment
- Recalculate when Amazon rules or capacity conditions change
Prepare these five inputs first.
- 01Average daily sales and variation
- 02Total lead time
- 03Safety stock
- 04Target days of cover
- 05Valid inbound quantity
SOURCES
Official references and related information
This article is general business-preparation information, not legal, tax, banking, immigration, product-compliance or marketplace-approval advice. Rules and fees can change; verify current official information before acting. JCDEN scope and pricing remain subject to the final confirmed proposal and policies.