Amazon FBA vs FBM: Which Costs Less?
Both pay Amazon the same referral fee. The difference is fulfillment — and which one wins comes down to your product's size, weight, price, and how fast it turns.
What each one actually is
FBA — Fulfillment by Amazon. You ship inventory to Amazon; they store it, pick, pack, ship, and handle returns and customer service. You pay a per-unit fulfillment fee plus storage. Your listings get the Prime badge.
FBM — Fulfillment by Merchant. You list on Amazon but ship every order yourself. No FBA fulfillment or storage fees; instead you carry the shipping cost, the packing labor, and the customer service.
Both pay Amazon's referral fee on the sale — see the Amazon FBA Calculator for the full per-unit breakdown, including the referral fee and fulfillment cost.
The trade-off in one view
| FBA | FBM | |
|---|---|---|
| Fulfillment cost | Amazon’s per-unit fee | Your shipping + labor |
| Storage | Amazon storage fees (rise with time) | Your own space |
| Prime badge | Yes | Only via Seller-Fulfilled Prime |
| Buy Box advantage | Stronger | Weaker |
| Control & branding | Less | More |
| Best for | Small, light, fast-selling | Large, heavy, slow, or low-margin |
When FBA wins
- Small and light. FBA fulfillment fees are lowest for compact items, and Amazon's shipping scale beats what you'd pay retail.
- Fast turnover. Quick sales keep storage fees trivial and let Prime's conversion lift compound.
- You value your time. FBA is hands-off; if packing orders is stealing hours from growth, that has a cost too.
When FBM wins
- Large or heavy. FBA fulfillment fees climb steeply with size and weight; self-shipping can be far cheaper.
- Slow movers. If inventory sits, storage fees — especially long-term surcharges — quietly erode margin. Ship it yourself.
- Thin margins. On low-price items the FBA per-unit fee can consume the whole profit; FBM may be the only way it pencils.
- You already have logistics. If you can ship efficiently, you keep what FBA would have charged.
Don't forget the sales-lift side
FBA usually costs more per unit but often sells more units, thanks to the Prime badge and a stronger Buy Box position. So the honest comparison is not just fee versus fee — it's (FBA fee, higher volume) against (FBM cost, lower volume). A product that sells noticeably better on Prime can justify the higher fulfillment cost.
How to decide
- Run your product through the Amazon FBA Calculator to get the true FBA net per unit.
- Work out your real FBM cost — shipping, packaging, and an honest value for your packing time.
- Factor in turnover: fast movers favor FBA, slow movers favor FBM.
- Add a realistic estimate of FBA's sales lift for your category before comparing.
Many sellers split by product — FBA for the small, fast items and FBM for the big, slow, or heavy ones. You don't have to pick one model for the whole catalog.
General information, not financial advice. Amazon’s fees and storage rates change and vary by category, size, and season — verify current figures in Seller Central.
Frequently asked questions
Is FBA or FBM cheaper?
It depends on the product. FBA (Fulfillment by Amazon) charges a per-unit fulfillment fee plus storage, but includes Prime shipping and handling. FBM (Fulfillment by Merchant) means you ship it yourself, avoiding those fees but taking on shipping cost, labor, and time. For small, light, fast-selling items FBA is often cheaper all-in; for large, heavy, or slow-moving items FBM usually wins.
What is the difference between FBA and FBM?
With FBA you send inventory to Amazon and they store, pick, pack, and ship it, and handle returns and customer service. With FBM you list on Amazon but fulfill orders from your own location. FBA buys you Prime eligibility and hands off logistics; FBM keeps control and avoids fulfillment and storage fees.
Does FBA really increase sales?
Often, yes — FBA listings get the Prime badge and tend to win the Buy Box more easily, both of which lift conversion. That sales lift is a real part of the comparison: FBA can cost more per unit but sell more units. Weigh the higher fees against the higher volume, not in isolation.
What kills FBA profitability?
Slow-moving inventory. Storage fees accrue the whole time stock sits in Amazon’s warehouse, and long-term storage surcharges make aged inventory expensive. A product that sells quickly amortizes fulfillment cost over fast turns; a product that lingers bleeds storage fees. Turnover, not just size, decides whether FBA pays.