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On the calculator, it uses widely accepted formulas, BUT...
No one's body is a machine! There is no formula that can tell you what your unique body will burn. The formulas can give you an estimate, sure, but not your exact calorie needs.
On the same note, there is no really accurate way (outside of something like a bodybugg, which measures a number of factors such as sweat, heart rate, etc. from an armband) to calculate the exact number of calories you are burning through exercise. Machines, notoriously, overestimate the number of calories you burn. My elliptical says I burn 1000 calories an hour, which is RIDICULOUS...even if I push pretty hard, I'm guessing it is closer to 400.
I put my numbers into there...the weight I am, the number of calories I eat a day, and it said I should be losing a lb a week...in reality, I lose about 2 lbs a MONTH. My metabolism, despite weight lifting and having tons of muscle, just doesn't burn a ton of calories to keep me going. These formulas ALWAYS tell me that I can eat about 500 calories a day more than I actually can.
I have known very few people who match the formulas. The people I do know who match the formulas either a) have a lot to lose, so they can eat more calories a day or b) have never had a weight problem. So I would never consider the numbers given to me as the end-all-be-all.
You might take the numbers given to you there as a starting point, but don't get discouraged if your body doesn't lose according to the formulas...almost no one's body does!
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