Exercise is typically 6-8 calories per minute. More than 8 is achievable with very high intensity or very high impact work. Cycling is neither. Endomodo gives you about 10cpm, which is very high for cycling. Spark says 5.6. This is much more realistic, if a little on what I would assume would be the low side.
I tried googling it and using a few other sites and got:
I tend to track my bike rides using the app endomondo on my android phone. When I get back I put in the workout using the mileage tracker by putting in the duration and the number of miles. I have found that often there is a huge difference between the list of calories burned between the two. An example: today was a 20mi bike ride in 143min. According to endomond calories burned was 1458 while spark said 812, which is almost half. If they were close I wouldn't worry about it, but since there is such a big difference I was wondering on which one would be more accurate.
Unfortunately a heart rate monitor won't fit into the budget for a while
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