Polar ft7?

mudbugs07

How accurate is the ft7 I got one today and plugged in all my info weight height age and so on my calorie was higher than what treadmill was. Does anyone question this? I wonder because I read on these board all the time that the cardio machines over estimate the calories. It all seem subjective to me. I also wonder why you can't use your HRM for lifting weights. I hear so many different stories on that one. If anyone can explain it to a simple minded person.