| calories used but how many?
After reading about Michael Phelps's calorie intake. I tried to work out how many calories I actually use/need. After a run on the treadmill, it says I've used 681calories, input the time/distance into sportstrack my running log, it reduces it to 493, an online calculator is more optimistic 560 but runners world suggests it was only 460.
Multiplied by a weeks running thats a huge variation, add in other activities like gardening, walking and housework, who knows what the actual calories used are!
I'm not really asking a question but if there are these discrepances in one activity I think its highly unlikely that anyone can accurately calculate their daily calorie output using internet tools. | 
