Maybe you're situation is fairly unique and that's why the calculators don't work well for you??? I personally think they're useful.
Nope. I'm pretty typical. Your calculator is off for my situation because it doesn't account for the college tax credit properly - while not everyone takes it, there's a whole lot of people that do. And the fact is that it takes just one thing like that for these calculators to call it the wrong way for someone, by a significant amount.
Your calculator also is very wrong on my "before" number because it got my state taxes wrong by a significant amount for some reason (a deduction I take under the old plan), so the delta it predicts is way off.
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