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I've been trying to understand the calories on these devices as well. After looking around on other forums and sites it seems that the Garmin Edges only use speed and time to calculate total calories burned. Those who have worked with PowerTap hubs say that the actual calorie numbers are about half of what the Garmins claim. I believe the number is independent of weight, so if you are on the bigger side (such as myself) the numbers are closer but figure 60%-70% of what the device says instead of half.