Does Amazon FBA Charge by Size? A Detailed Explanation of Amazon FBA's Size-Based Pricing Policy

Amazon FBA Fulfillment by Amazon is a warehousing and fulfillment service provided by Amazon. It helps sellers store their products in Amazon's warehouses and sell them through the Amazon platform, including packaging and shipping. For merchants using the FBA service, understanding its pricing structure is crucial, especially regarding how dimensions and weight affect charges.

According to Amazon’s official guidelines, the primary basis for FBA charges is the product's size category and weight. Specifically, Amazon categorizes all products into different size classes, including small standard-size, large standard-size, small oversized, and large oversized items. Each size category has corresponding delivery fee standards, which vary with the product's weight. In essence, Amazon FBA warehouses charge based on the product's dimensions.

For example, if an item falls under the small standard-size category and weighs less than one pound, its delivery cost might be around a few dollars. However, for a large oversized item of the same weight, the delivery cost could significantly increase. Amazon also offers a service called Multi-Channel Fulfillment MCF, allowing non-Amazon sellers to utilize Amazon's warehousing and logistics network. Although MCF fees are generally slightly higher than regular FBA fees.

It is worth noting that besides basic delivery fees, Amazon also charges other related fees such as monthly inventory storage fees and removal order fees. The specific amounts of these fees are also influenced by the product's dimensions. For instance, some bulky but lightweight items may incur higher storage costs because they occupy more warehouse space.

From news reports, Amazon has been constantly adjusting its FBA policies in response to market changes in recent years. For example, at the beginning of 2025, Amazon announced a new priority delivery program aimed at optimizing logistics efficiency and reducing environmental impact. This plan requires sellers to ensure their products meet specific size and weight limits; otherwise, they may not enjoy more favorable delivery prices. This move reflects Amazon's intention to improve overall operational efficiency through refined management of the logistics process.

At the same time, many merchants have reported that frequent changes in FBA pricing standards make it difficult for them to accurately predict cost expenditures. A cross-border e-commerce professional from Beijing mentioned in an interview that his company mainly exports electronic products to Europe and America through Amazon. Each update in pricing standards causes significant fluctuations in our profits. He also added that although Amazon provides detailed fee calculation tools, there remains some uncertainty for complex product combinations.

To help merchants better understand and adapt to these changes, Amazon regularly holds online seminars and releases relevant guideline documents. These emphasize planning inventory structures and choosing suitable delivery solutions. For instance, it is recommended that merchants avoid stockpiling too many large or oversized items, as these not only consume more warehousing resources but also have relatively high delivery costs.

In summary, Amazon FBA warehouses indeed charge based on product dimensions, with the aim of balancing logistics efficiency and cost control. However, for businesses relying on this platform, to maximize benefits, it is essential to closely monitor Amazon's various policy dynamics and flexibly adjust supply chain strategies. Only then can they maintain competitiveness in fierce market competition.