Amazon FBA vs FBM: Which Fulfillment Method Is Right for Your Brand?

What Is Amazon FBA?

Fulfillment by Amazon (FBA) is Amazon's warehousing and shipping service. You send your inventory to Amazon's fulfillment centers, and they handle storage, picking, packing, shipping, customer service, and returns for orders placed on Amazon.

FBA products are eligible for Prime shipping, which can significantly increase conversion rates. Amazon charges storage fees (monthly and long-term) plus fulfillment fees based on product size and weight.

What Is Amazon FBM?

Fulfillment by Merchant (FBM) means you handle storage, shipping, and customer service yourself, or through a third-party logistics provider (3PL). You list products on Amazon but fulfill orders from your own warehouse or facility.

FBM gives you more control over the customer experience and packaging, but you miss out on Prime eligibility unless you qualify for Seller Fulfilled Prime (SFP).

Cost Comparison

When to Use FBA

FBA is the right choice when:

• Your products are small and lightweight. FBA fees are most competitive for products under 1 lb.
• You want Prime eligibility. Prime badges increase click-through and conversion rates by 20-30% on average.
• You don't have warehouse infrastructure. FBA eliminates the need for your own fulfillment operation.
• You're scaling quickly. Amazon's fulfillment network scales with demand, so there is no need to hire during peak seasons.

When to Use FBM

FBM makes more sense when:

• Your products are large or heavy. FBA fees for oversized items can eat into margins significantly.
• You already have efficient fulfillment. If your 3PL or warehouse ships cheaply, FBM can be more profitable.
• You sell low-velocity items. Long-term storage fees punish slow-moving inventory in FBA.
• You want full control over packaging and branding. FBM lets you customize the unboxing experience.

The Hybrid Approach

Many successful Amazon sellers use both FBA and FBM. They keep bestsellers in FBA for Prime eligibility and fast shipping, while fulfilling slower-moving or oversized items via FBM.

This hybrid approach optimizes for both conversion (Prime badge on top sellers) and margin (lower fulfillment costs on items where FBA fees are disproportionate).

How to Decide

Run the numbers for your specific products using our Amazon FBA Fee Calculator and Amazon Unit Economics Calculator. Compare the all-in cost per unit for each fulfillment method, including storage, shipping, returns, and customer service overhead.

The right answer depends on your product dimensions, sales velocity, and margin targets. There's no universal "better" option, only what's better for your brand.

Need Help Deciding?

At Your eCom Team, we've helped 200+ brands optimize their Amazon fulfillment strategy. We analyze your product catalog, sales data, and cost structure to determine the optimal mix of FBA and FBM. Get in touch for a complimentary strategy session.