This is only a discussion.How much space does each active user consume in the database? The assumption is that when a user is active the user is able to log into the SharePoint server.If a user is not active, then only the history data would be left on the database.
closed as unclear what you're asking by Robert Lindgren♦, PirateEric♦, RJ Cuthbertson, Benny Skogberg♦, Daniel Ziga Sep 17 '13 at 16:52
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The only significant space usage is from the User Profile Application Service, which uses an estimated 1MB per user. Profile sync is another 600KB and social tagging will add 0.009MB per tag, comment or rating.
Source: Core Solutions of Microsoft SharePoint Server 2013