how many km to walk to lose 1 kg?
Anyway, to give you a theoretical answer, 1Kg of fat loss per week is 9000 kcal per week or 1285 kcal a day. To be on the safer side, keep it at 1400 kcal. One KM of walking at 10 minutes/KM pace (6 KMph) by 65 Kg weighed person will burn 40 kcal of energy (as shown my Pedometer).