Compare the operating assumptions
FBA and FBM cost considerations
| Factor | Amazon FBA | Amazon FBM |
|---|---|---|
| Fulfillment work | Amazon handles eligible fulfillment operations under its program terms | Seller arranges storage, picking, packing, and shipping |
| Cost inputs | Applicable fulfillment estimate, inbound placement or shipping, storage, and other costs | Seller's shipping label, packaging, labor, storage, and handling costs |
| Product assumptions | Verify dimensions, weight, category, and current fee classification | Use actual seller-fulfilled delivery and handling costs |
| Decision check | Estimate total cost per unit and inventory hold assumptions | Estimate delivery cost, labor, and service obligations per unit |
Compare complete operating models
For FBA, verify current program fees and the product's size and weight classification. For FBM, enter the costs of shipping, labor, packaging, storage, and service that your own operation incurs.
A higher fee in one line item can still produce a different overall result once delivery, storage, labor, and return assumptions are included. Compare estimated net profit and downside cases using equivalent prices and supplier costs.
Use your own fulfillment costs
Seller-fulfilled costs vary by package, destination, carrier, service level, and labor setup. A generic estimate may not reflect your actual operation, so replace assumptions with your own measured costs when possible.
Cost lines to compare
For FBA include the fulfillment fee, storage, inbound, and prep. For FBM include carrier cost, packaging, labor, and your storage.
Include the effect on the Buy Box and customer service work, because those can change both sales volume and cost.
Measure the FBM work you would actually perform
For an FBM estimate, list the costs controlled by your operation: shipping label, packaging, pick-and-pack time, storage, and an allowance for returns or other handling. A simple labor estimate is minutes per order ÷ 60 × your chosen hourly labor cost.
Compare that total with the FBA assumptions for the same selling price, supplier cost, product, and listing pack. The relevant result is the complete per-unit estimate under your operation, not a headline fulfillment fee in isolation.
- Use your own carrier, package, and labor costs for FBM.
- For FBA, verify current category, dimensions, shipping weight, and inbound/storage assumptions.
- Run both methods at a lower selling price to see whether either has enough margin cushion.
Common questions
Frequently asked questions
Which is more profitable, FBA or FBM?
It depends on the product and your actual costs. Compare complete per-unit estimates rather than assuming one method is always cheaper.
Does an FBA estimate include every seller expense?
Not necessarily. Enter additional expenses such as inbound shipping, storage assumptions, advertising, returns, or preparation costs when they apply.
When is FBM better than FBA?
FBM can win for large, heavy, slow-selling, or low-volume items where your carrier rates and storage are cheaper than FBA fees. Compare actual costs.
Ready to check a listing?
Put the assumptions to work.
Bring the visible listing facts and your own costs into a product audit before you commit to inventory.