Fulfillment Center
The warehouse where Amazon stores and ships your FBA inventory.
Definition
A fulfillment center is a large warehouse where a third party receives, stores, picks, packs, ships, and processes returns for a seller's orders. Amazon's FBA network is built on fulfillment centers (coded like PHX7 or ONT8), and when you send inventory into FBA it is distributed across them so Amazon can handle fulfillment for you.
Fulfillment center vs a plain warehouse
A warehouse stores things. A fulfillment center is built around outbound order flow: receiving inbound shipments, putting them away, then picking, packing, shipping, and processing returns at high speed. Everything inside is organized to get a single unit out the door to a customer quickly, which is what you are paying for with FBA.
How Amazon's fulfillment network shapes your costs
Your inventory does not sit in one building. Amazon spreads it across multiple fulfillment centers to put stock closer to buyers, and how you split an inbound shipment across locations affects the inbound placement fee you pay. Storage fees are charged on the space your units occupy in those centers, so slow movers quietly accrue rent the whole time they sit.
How fulfillment centers connect to your restock decisions
You do not choose which fulfillment center gets your stock, but you do choose how and when to send it. Sending to fewer locations costs an inbound placement fee but keeps your shipment simpler; letting Amazon split it across more centers avoids that fee and can put units closer to buyers faster, at the cost of more destinations to manage. Either way, check-in is not instant: there is a variable delay between when your truck arrives and when units become sellable, and it can stretch significantly during Q4 peak. Track that in-transit-plus-check-in lag so your reorder dates account for it.
Related terms
Plan inbound around the FC network
Inventory Hero times and sizes your inbound shipments to real demand, accounting for check-in lag, so units become sellable before you run low.
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