Abstract: Systems and methods for outputting a size code include receiving a plurality of size nodes for a plurality of users, the plurality of size nodes comprising incoming size nodes or outgoing size nodes for one or more items, generating a plurality of size profiles based on the plurality of size nodes, wherein the plurality of size profiles each correlate a size for each item entity to each other item entity of the respective item entities, receiving first user size nodes for a first user, matching the first user to a first size profile of the plurality of size profiles based on the first user size nodes, receiving a first item corresponding to a first item entity of the item entities, identifying, at the size engine, a size code for the first item based on the first size profile, and outputting the size code.