Nasa says six to ten feet so New Orleans will be under water and Galveston will have problems.
If the ice caps melted, How much would the sea level raise?
Good link: See the link in my comment below. I missed the end "l" and correcting the spelling in my answer did not make the link work.
Long story short, here's the good link: (highlight it, right click and select "go to") http://www.johnstonsarchive.net/environment/waterworld.html