calories burned on treadmill?

[GOHVYORGOHME]

I usually walk about 3.0miles at 4.0mph for 30min each session. The treadmill says I burn about 400 calories. The online activity counters say I'm only burning 204 calories. Which should I trust?

 

[big4life]

I don't care for those calorie burned calculators on the treadmill or computer. They don'take into account your heart rate before getting on the treadmill. I have also found a slight difference in brands of treadmills. We have two different types at my gym, and one seems to be faster than the other at the same speed setting. I just try to use the treadmill monitors for general information, not accurate calorie counting.

 

[xevius]

I wouldnt trust the treadmill calculator either.