How do you convert kJ reported by a power meter to calories? The manual said, calories burned is roughly roughly .85-.95 of total kJs reported for the ride. A book I am reading says amount of Calories burned is +/- 10% of total kJ, interesting part is +. Then I remember reading something that had a formula which result came out very close to 1:1 ratio. So is this the case of them all being right, and it depends on individual?