Muay Thai Welterweight (Pro & Amateur) 142.1-147 lb or 64.59-66.8 kg World Muay Thai Council (WMC), welterweight range is from 140 to 147 lb or 63.5 to 66.6 kg World Muay Thai Federation (WMF), the official amateur organization, fixed welterweight from for adult; the junior category is the same as adult The official rules of shoot boxing define welterweights as between . In Olympic taekwondo, welterweight falls between . At the weight classes for the Olympic games it is between . References External links Boxing weight classes Kickboxing weight classes Professional wrestling weight classes Taekwondo weight classes Wrestling weight classes