Overview

Amazon has implemented a set of mandatory product listing attributes designed to standardize how quantity and size information appears across the marketplace. These rules affect how unit count values are derived, which item form options are available, and what net content details sellers must provide. Understanding these requirements is essential for keeping your ASINs visible in search results and avoiding catalog errors that could suppress your listings.

Key Points / What Sellers Need to Know

• Unit Count is now conditionally derived — For 138 product types, Amazon automatically constructs unit count values based on other catalog attributes including item form, number of items, net content weight, net content volume, and net content count. Sellers no longer have full manual control over this field in affected categories.

• Three attributes are now mandatory — Amazon requires sellers to provide a normalized value of size (mandatory for 8 product types as a combined count, weight, and volume attribute set), item form (mandatory for 86 product types), and number of items (mandatory for 154 product types).

• Non-compliant ASINs risk search suppression — If your listings contain values that fall outside the allowed options for your product type, Amazon may generate catalog errors. If left uncorrected, your ASIN could be removed from search results entirely.

• Allowed values are restricted by product type and item form — The unit of measure you select must match a pre-approved combination based on your product type and item form. For example, a dishwasher detergent product with a liquid form must use "Fl Oz" as the unit.

• Normalization rules apply automatically — Amazon derives unit count values from attributes like unit_count, number_of_items, net_content_weight, net_content_volume, and net_content_count to create a consistent shopping experience.

How the Conditional Unit Count System Works

Amazon's conditional unit count system automatically calculates and displays quantity information based on a combination of product attributes rather than relying solely on seller-provided values. For the 138 affected product types, the system looks at your item form selection alongside net content details to determine the appropriate unit count display. This means the unit count shown to customers is derived from your other listing data, ensuring consistency across similar products. If your product type and item form combination requires a specific unit of measure, only that value will be accepted. Sellers should consult Amazon's complete product type list and FAQ documentation within Seller Central to confirm which rules apply to their specific categories.