Okay, are the calorie counters on treadmills, bike machines and other aerobic machines accurate? How do they determine exactly what your burn rate is? Most of them have you put your weight, age, etc. before you start. Is this part of some universal formula? Yesterday I did 5 miles on a treadmill with varying speeds and inclines it didn't seem right that after 45 minutes it said I burned 1047 calories.