Originally Posted by
Chaco
I'm fairly close to you - 63, 223 lbs. , max HR 172, and same stats on cruise speeds and ride averages.
My last ride was 1 hr. 51 min., 30.0 miles, 2005 feet of climbing, avg. speed 16.3 mph.
Calories for that ride = 938, or 31.2 calories per mile.
I think my reading is far closer to accurate that what you're getting. You could probably cut your Garmin reading exactly in half and get a reading pretty close to reality.
What do you use for measurement? 52% variance seems sorta large: the rainmaker link shows "conventional heart rate level based estimation with general equations" to have an error range of 20%-35%.
BTW Looigi: very handy, thanks for the link!