Units of Land Area Calculation in Nepal Land area is calculated in the following units in Nepal. Area: Ropani, Anna, Paisa, Dam 508.74 sq m = 1 ropani = 16 anna = 5476 sq. ft. 31.79 sq m = 1 anna = 4 paisa = 342.25 sq. ft. 7.94 sq m         = 1 paisa = 4 dam = 85.56 sq. ft. Area: Bigha, Katha, Paisa, Dam 6772.41 sq m = 1 Bigha = 20 Katha = 72900 sq. ft. 338.62 sq m = 1 Katha = 20 paisa = 3645 sq. ft. 16.9 sq m    = 1 Paisa =         = 182.25 sq. ft.