How many calories should an average 11 year old child consume in 1 day?

Institute of Med est. The estimated energy requirements of the average 11yo female @ 37 kg (81lb) & an average height of 1.42m (56.5in) using institute of medicine guidelines yields a range from ~1625 to 2200 calories based on activity level. Sedentary lifestyle for the lower end and active lifestyle for the higher.