Overview

Amazon has launched a size‑normalisation engine that automatically converts and displays product quantity information in a uniform format across all search results and detail pages. The system pulls data from existing catalogue attributes, applies regional unit conversion and presents a single, clean quantity label. Sellers must verify that their unit‑count fields are accurate to benefit from higher conversion rates and consistent presentation.

Key Points

• Uniform quantity label — All listings now show quantity in a standardized format, eliminating the varied free‑text descriptions previously seen.
• Automatic regional conversion — A US shopper will see ounces (oz) while an Australian shopper will see grams (g) for the same product, based on the marketplace’s local units.
• Attribute‑driven generation — The engine uses the catalogue fields unit count, unit count type and number of items to build the displayed quantity.
• Higher conversion odds — Amazon reports that listings with correctly formatted quantity values achieve noticeably better purchase rates than those without.
• Cross‑marketplace efficiency – One set of accurate attributes serves every Amazon marketplace, removing the need for duplicate quantity entries per region.

How Size Normalisation Works

1. Data extraction — The system reads the three core catalogue attributes (unit count, unit count type, number of items). Example: A pack of 12 × 30 ml bottles is stored as unit count = 30, unit count type = ml, number of items = 12.
2. Normalization processing — It combines the extracted values into a single, clean label and strips any seller‑entered free‑text. Example: The above data becomes “360 ml” on the US site.
3. Regional unit conversion — Based on the shopper’s marketplace, the engine converts the base unit to the locally familiar measurement. Example: The same 360 ml label appears as “12.7 oz” for a US buyer and as “360 ml” for a UK buyer.