Amazon glossary
What is FBM?
FBM — Fulfilment by Merchant.
By AIAdKing Editorial Team · Reviewed
- FBM — Fulfilment by Merchant
- FBM (Fulfilment by Merchant) means you store, pack and ship orders yourself instead of using Amazon’s warehouses. You avoid FBA storage and fulfilment fees but handle logistics and returns, and you don’t automatically get Prime unless you qualify for Seller-Fulfilled Prime.
In depth
FBM gives you control of logistics and skips FBA’s storage and fulfilment fees, which can suit bulky, heavy, slow-moving or high-margin products where those fees bite hardest. The trade-offs are real: no automatic Prime badge (unless you qualify for Seller-Fulfilled Prime), tougher Buy Box competition against FBA offers, and you carrying shipping, returns and customer service. The decision is arithmetic, not allegiance: land the true per-unit cost both ways — courier, packaging, labour and storage on one side; the full FBA fee stack on the other — in the profit calculator, and remember conversion differs too, since the Prime badge measurably lifts click-through and conversion. Many sellers run a mixed catalogue — FBA for fast movers, FBM for oversize and slow items — and some keep an FBM offer live as a backup so the listing keeps selling through an FBA stockout.
Worked example
The same $24.99 gadget shipped FBM: courier $4.80, box and filler $0.55, your own storage effectively $0.15/unit, referral fee $3.75, product cost $6.00 — $9.74 per-unit profit, nearly identical to FBA's $9.88. But the Prime badge typically lifts conversion meaningfully, so FBA usually nets more total profit here despite the near-tie per unit. Flip the product: a 2 kg oversize item where FBA fulfilment jumps past $9 while your courier charges $6.20 — now FBM wins clearly. The right answer is per-SKU arithmetic, not ideology.
When to use it
Model FBM whenever FBA fees exceed roughly a quarter of an item's price, for fragile or oversize goods, and for slow movers that would rack up long-term storage fees. Revisit the comparison at every fee-schedule change.
Common mistakes
- Forgetting the conversion gap — an FBM offer that saves $1.20 in fees but converts 20% worse usually nets less profit and less rank.
- Underpricing your own labour and materials — boxes, tape, filler and pick-pack minutes are real costs FBA was charging you honestly.
- Missing performance requirements — late-shipment and tracking thresholds still apply, and slipping metrics cost you the Buy Box FBM already fights harder for.
How AIAdKing handles FBM
AIAdKing tracks profit and orders across both FBA and FBM, so your true margin and Buy Box picture are accurate whichever way each SKU is fulfilled.
FBM — quick answers
What is FBM?
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