Yeah, I don't think anyone should be using that calculator to guage whether or not to drive. According to that I can have 5 beers in 1 hour and still be 0.07 and change. I'm pretty sure that's wrong... though it just might be a dare!
(tested by BAC, of course, not behind the wheel, before the torches and pitchforks appear)
The fact of the matter is, regardless of what we all like to think when it's us involved, 0.08 - 0.09 BAC represents impaired judgement, concentration and motor skill, even if we're not falling down drunk.