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This article applies to selling in: United States

Unit weight

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Definition Unit weight is the measure of how much your product weighs packaged. The value is used as an input to calculating fees.
Using this article Unit weight is a critical input to determining shipping weight and product size tiers.
Fees that use this attribute

FBA fulfillment fees

Monthly inventory storage fees

Long-term storage fees

FBA inventory storage overage fees

FBA removal order fees

FBA disposal order fees

Fulfillment fees for Multi-Channel Fulfillment orders

FBA Inventory Placement Service fees

FBA Prep Service fees

Related terms

Product size tiers

Dimensional weight

Product dimensions and volume

FBA fees reimbursement policy: Weight and dimensions

Shipping weight

How to determine the unit weight

For new products, you should weigh your fully packaged product. Ounces (oz) and pounds (lb) are both used as inputs to fee calculations in the US.

Important: If a product is sold as a set, the weight and dimensions are the combined total of all of the items in the set packaged together.

For products you currently have in FBA inventory, you can look up your unit weight using the Fee Preview report. To do so:

  1. Download the report.
  2. Identify the product you are looking for by its FNSKU.
  3. View the unit weight in the item-weight field.

For products that are already being sold on Amazon but you do not sell, you can look up the unit weight using the Revenue Calculator. To do so:

  1. Search for the product of interest.
  2. View the Unit weight value.

Note: Amazon may verify the weight and dimensions of a product using representative samples. Amazon’s information about a product’s weight and dimensions will be used to calculate fees if there is a difference between Amazon’s information and a seller’s information. Amazon may change its information about a product’s weight and dimensions from time to time to reflect updated measurements. Fees based on the weight and dimensions of a product are calculated using Amazon’s information about the weight and dimensions of that product at the time the fee is calculated.

Frequently asked questions

How is unit weight different from shipping weight?

Unit weight is used as an input to calculate the shipping weight. Shipping weight also takes into account the dimensional weight in certain cases. View more details on the Shipping weight page.

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