Those charts are worth about as much as the paper they are written on...that ones not even on paper so you get the point. They do not take into account bone density, muscle mass, water percentage, etc.
By the way, it has me in the overweight catagory...I am 5'7 and 156 lbs.
Lets see, this week I will have biked 250 miles, ran 65 miles and swam 10,000 yards....wonder what it takes to be in the normal range other than forcing yourself to throw up after every meal?

And Moncha, you were looking a little plump in Moab!
Just kidding of course!

Off to the pool I go...gotta get skinny!