"How are you" in Italian
  "How are you" is an important sentence-question. It's to express politeness and to ask about us. 
"How are you" in Italian is a very important phrase to learn for all Italian learners. 
Here I've got a video about it.
[youtube]http://www.youtube.com/watch?v=RVxYAmUwzsc[/youtube]
Well, if you need just the answer, then: "How are you" in Italian is 
Come stai?(
http://en.wiktionary.org/wiki/come_stai)