What is the FBA fulfilment fee?

The per-unit charge for Amazon picking, packing and shipping your order.

The FBA fulfilment fee is what Amazon charges per unit sold to pick your product off the shelf, pack it and deliver it to the buyer - returns handling and customer service included. It is set by the item's size tier and weight, which is why a light, small product can be profitable at a price where a bulky one is not.

Together with the referral fee it makes up the bulk of Amazon's cut on a typical FBA sale. Both are already applied in every scan result and in the free calculator, so the profit you see is after Amazon's fees, not before.