I've noticed that in the recent Hulk movies his size varies from movie to movie. I've heard, but don't know for a fact that the size of the Hulk seemed to change during the 2003 Eric Bana Hulk movie.
In the Ed Norton version he seems to be 2-3 stories tall. But in the more recent Avengers movie I'd say he was more like 2-3 meters. I can see why he is made smaller in this movie, since he was going to go toe-to-toe with Thor.
So, is there a size that is ever mentioned in the comics? Or do the comics leave room for his size to change to fit the situation?