It depends on what topic your trying to search.
With the default settings, Google will show 10 results per page. You can, however, adjust these settings.
If you are meaning how many show up in the search results, probably somewhere in the 10s of Trillions
There are over 1 billion Google searches per day. There are over 8 billion indexed pages with Google and rising.
In Sept 2005, google indexed about 8 billion pages. They stopped advertising their index size on their search page since then.A google blog page...