Mahuar Kalna is a village in Robertsganj tehsil in district of Sonbhadra, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Mahuar Kalna was 118 which includes 65 males and 53 females. Mahuar Kalna covers 258.53 ha area. Pincode of Mahuar Kalna is 231208.