SQL Server 2005: Full-text search space requirements

Question

Is there a way to calculate the physical drive space required for a full-text search catalog? Space is cheap, but I'd like to know what I'm getting into.

I'm looking at a table of about 200 articles ranging in length. I'd like to index the title field, and the body of the article.

UPDATE: I'm somewhat looking to predict the future. For example, 200 articles, the title is varchar(500) and the article body is varchar(max). So, without creating the index, can an estimate be done on how large the full-text search catalog may be?