How many calories need to be burnt to get rid of 1 kg of human body fat?

Fat caloric value: A pound (454gm) of fat represents about 3500 calories (@ 9 kcal/gm). A kg is about 2.2 pounds, so that's 7700. Eating 175 fewer calories a day would mean losing a pound every 20 days. Or if you burned an extra 175 calories a day by exercising more, then you could lose a pound in about 20 days.The combination of both would accelerate and double that weight loss.