I've just finished my first GPS-tracked bicycle workout. I tracked my "achievements" using two different sport trackers -- Endomondo and Runastic (I'm using both in the same time purely for testing purposes).
Results reported by both sport trackers (distance, time, speeds) are nearly the same, except for number of calories, that I burned. Endomondo shows value twice as big, claiming that I burned 609 calories, while Runastic reports only 328.
I expected to find some differences, as calories burnout is a value, that can't be measured with high precise (at least in these circumstances), but having these values twice as big actually surprised me.
My workout was 45 minutes cycling, on 10,5 km distance. I'm 181 cm and my weight is 120 kg (metric).
This question is not releated to some problems in any of these sport trackers software. I'm precisely asking, which of these two presented values is (should be) more close to reality? Basing on above workout parameters, how many calories should I burn?