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Weight classes are divisions of competition used to match competitors against others of their own size. Weight classes are used in a variety of sports including rowing, weight lifting, and especially combat sports [1] such as boxing, kickboxing, mixed martial arts, wrestling, and Brazilian jiu-jitsu.
105 lb (47.6 kg) in 1860 by London Prize Ring Rules; 116 lb (52.6 kg) in 1898; established officially at 8 + 1 ⁄ 2 st (119.0 lb; 54.0 kg) in 1909 by NSC and 118 lb (53.5 kg) in 1920 by Walker Law Flyweight
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 65.0 to 67.0 kg (143.3 to 147.7 lb) for adult and junior; The official rules of shoot boxing define welterweights as between 65 and 67 kg (143 and 148 lb).
The MMA welterweight class is therefore significantly heavier than the welterweight class of these other sports. For the sake of uniformity, many American mixed martial arts websites refer to competitors between 156 and 170 lb (71 and 77 kg) as welterweights. This encompasses the Shooto middleweight division (167 lb / 76 kg).
The 1947 Admiral-Lord Mountevans rules set out seven weight divisions with maximum weight limits and called for champions to be crowned of each limit: Lightweight: 11st (154 lb or ~70 kg), Welterweight 11st 11 lb (165 lb or ~75 kg), Middleweight 12st 8 lb (176 lb or ~80 kg), Heavy Middleweight 13st 5 lb (187 lb or ~85 kg), Light Heavyweight ...
55 kg (121.3 lb) Featherweight 57.5 kg (126.8 lb) Super Featherweight 60 kg (132.3 lb) Lightweight 62.5 kg (137.8 lb) Super Lightweight 65 kg (143.3 lb) Welterweight 67.5 kg (148.8 lb) Middleweight 70 kg (154.3 lb) Super Middleweight 80 kg (176.4 lb) Light Heavyweight 90 kg (198.4 lb) Heavyweight Unlimited
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The middleweight division in mixed martial arts refers to different weight classes: The UFC's middleweight division, which groups competitors within 171 to 185 lb (77.5 to 84 kg) The Shooto's middleweight class, which refers to competitors between 155 and 170 lb (70.3 and 77.1 kg)