The World Boxing Council, World Boxing Association, World Boxing Organization and International Boxing Federation govern 17 weight classes at the professional level of this sport. Class names vary somewhat and the weight limits range from 105 pounds in the lightest category to unlimited in the heaviest. On the amateur side, the Olympic tournaments feature 10 weight classes ranging from the lightest, with a 46-kg limit, to an unlimited class.
The is the lightest boxing weight at the professional level at 105 pounds, or 47.627 kilograms. The IBF and WBO call this the Mini Flyweight Division. The WBC refers to it as the Strawweight and the WBA calls it Minimumweight.
Junior Flyweight/Light Flyweight
Next is the 108-lb. or 48.988-kg. division -- called Junior Flyweight (WBO, IBF) or the Light Flyweight (WBA, WBC). In the Olympics, the lightest class is Light Flyweight with a 46-to-49-kg. limit.
This is the universally recognized name for the 112-lb. class, or 50.802-kg. In the Olympics, this class limit is 52 kg.
Super Flyweight/Junior Bantamweight
The next highest professional class is 115 lbs. or 52.163 kg. -- called Super Flyweight (WBA, WBC) or Junior Bantamweight (IBF and WBO).
This is the universally recognized name for the 118-lb. or 53.525-kg. class. In the Olympics, this class limit is 54 kg.
Super Bantamweight/Light Featherweight
The next highest professional level is 122 lbs. or 55.225 kg. -- called the Super Bantamweight (WBA, WBC) or Light Featherweight (IBF, WBO).
This is the universally recognized name for the 126-lb. or 57.153-kg. professional class.
Super Featherweight/Junior Lightweight
The next heaviest professional weight is 130 lbs. or 58.967 kg. -- called Super Featherweight (WBA/WBC) or Junior Lightweight (WBO/IBF).
This is the universally recognized name for the 135-lb. or 61.235-kg. class. In the Olympics, this class limit is 60 kg.
Super Lightweight/Junior Welterweight
The next heaviest class is 140 lbs. or 63.503 kg. -- called Super Lightweight (WBA/WBC) or Junior Welterweight (WBO/IBF). In the Olympics, the Light Welterweight class limit is 64 kg.
This is the universally recognized name for the 147-lb. or 66.678-kg. class. In the Olympics, its limit is 69 kg.
Super Welterweight/Junior Middleweight
The next heaviest professional weight is 154 lbs. or 69.853 kg. -- called the Super Welterweight (WBA/WBC) or Junior Middleweight (WBO/IBF) class.
This is the universally recognized name for the 160-lb. or 72.574-kg. class. In the Olympics, its weight limit is 75 kg.
This professional class is 168 lbs. or 76.203 kg.
This class is 175 lbs. or 79.378 kg. In the Olympics, its limit is 81 kg.
The second heaviest class is 200 lbs. or 90.892 kg. -- called Cruiserweight (WBA/WBC/IBF) or Junior Heavyweight (WBO). In the Olympics, 91 kg. is the Heavyweight class limit.
This is the heaviest division, for boxers who weigh more than 200 lbs. or 90.892 kg. In the Olympics, the over-91-kg. class is called Super Heavyweight.