In Thailand we are using other measurements; 1 Talang Wah is 4 square meters or 42.7 square feet, 1 Ngan is 100 Talang Wah or 400 square meters or 4,277 square fee and 1 Rai or 4 Ngan or 400 Talang Wah is 1,600 square meters and 17,108 square feet.