This will show you the number of pages for the exact search term .
A lot will tell you to keep this actual competition below 20,000.
They are wrong .
What if you only have 20 competitors , but they are all experienced marketers with a lot of back links and other proven glue ?
What if the keyword is dominated by static sites or 2.0 sites .? Will your articles rank if you no other articles are ?
Would we be better off to tackle a term that is showing 500,000 competition but are using articles to rank several of the top spots ?