Fulfillment & Operations

FBA

Fulfillment by Amazon - sellers ship inventory to Amazon warehouses for storage and fulfillment.

1 min readLast updated Apr 2026

Fulfillment by Amazon - sellers ship inventory to Amazon warehouses for storage and fulfillment.

Why It Matters

FBA unlocks Amazon Prime eligibility, massively increasing conversion on Amazon. It outsources fulfillment complexity and provides 1-2 day shipping that customers expect. For brands selling on Amazon, FBA is often essential to compete despite the fees.

Practical Example

Scenario

A supplements brand tests FBA vs FBM (self-fulfillment) for their Amazon listings.

Calculation

FBM: 2.1% conversion, $45 margin. FBA: 5.8% conversion, $38 margin (after fees). Volume: FBM 420 units/month, FBA 1,160 units/month

Result

Despite lower per-unit margin, FBA generates $44,080/month profit vs $18,900 FBM—2.3x more profit due to Prime-driven conversion.

Pro Tips

  • 1Use FBA revenue calculator to understand true profitability after all fees
  • 2Optimize packaging dimensions to minimize dimensional weight fees
  • 3Monitor IPI (Inventory Performance Index) to avoid storage limits
  • 4Remove slow-moving inventory before long-term storage fees hit

Common Mistakes to Avoid

Sending too much inventory and incurring long-term storage fees
Not accounting for all FBA fees in margin calculations
Ignoring IPI score until storage limits are imposed

Frequently Asked Questions

Related Terms

FBM

Fulfillment by Merchant - sellers handle their own fulfillment for marketplace orders.

Amazon Prime

Amazon's membership program offering free fast shipping. Products must meet requirements for Prime badge.