calorie's i burn

How do i count how many calorie's i burn. Becuase when i'm on a treadmill it would say i burn 200 calorie's i 20 mins but it say's the same thing for my uncle and he weigh's 70 lbs more then me.
 
It's entirely possible. I mean, is he working out as hard as you are?

Also, he weighs more, but those machines ask for your weight AND age - older people burn calories at a slower rate than younger people, so that could offset the fact that he weighs so much more (since heavier people tend to burn calories faster than lighter people).
 
is there a way to calculate calories burnt in the weight room?

like a site somewhere with a calculater that takes into account your age, height, weight, leel of excursion etc?
 
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