This is a discussion on Sorry for then dumb question but hound I see how much storage I have used? within the iPad Help forums, part of the Apple iPad Discussions category; Please...
You can see the totals in Itunes when sync to the Ipad from computer.
I found it is settings also.
I prefer to think of it as the glass being half empty by knowing how much storage space I have left for more books, apps, music, videos, etc.
settings > genteral > About
should show the storage.