Amazon FBA costs include two parts: storage fees and delivery fees.

Storage fees are calculated based on the size and weight of the product, and a certain fee is charged every month.

Delivery fees include fees such as packaging, labeling, shipping, and order processing, which are calculated based on the size, weight, and destination of the product. In addition, there are some other fees such as return processing and long-term storage fees. In order to accurately calculate FBA costs, all of these factors need to be taken into account and forecasted and planned based on the sales of the products.