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I thought that mapmyride's calorie calculation is way too high, and googled. I reached to their website's calorie calculator. Now, I was playing with the parameters. Weight, height, age, activities, distance, duration. Distance and duration are obvious. Weight - it's easy to understand that more weight - more calories. However two factors that I don't understand. Age - between age 20 and 44, 44 burns 10% more calories Height - 6-2 burns about 8% less than 5-2. Does anybody know why height and age matters to the calorie calculation?