 With an area of 851.54 square kilometers, Kalu has a population density of 218.64, which is greater than the Zone average of 147.58 persons per square kilometre.A total of 41,648 households were counted in this woreda, resulting in an average of 4.47 persons to a household, and 40,115 housing units.The majority of the inhabitants were Muslim, with 98.73% reporting that as their religion, while 1.17% of the population said they practised Ethiopian Orthodox Christianity.