Why are boxers divided into weight classes?

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Floyd Mayweather Jr., wearing black and gold trunks, lands a left punch on Manny Pacquiao, in yellow trunks, during their welterweight title fight in a boxing ring. — boxing Manny Pacquiao (right) and Floyd Mayweather, Jr., in their 2015 welterweight bout; Mayweather won in a unanimous decision.

Boxers are divided into weight classes primarily to ensure fair competition. This system was established during the 19th and early 20th centuries to eliminate the significant disadvantage smaller contestants faced when forced to concede excessive weight to their opponents.1

By grouping athletes of similar body mass, the sport minimizes the physical disparity between fighters, allowing for more balanced matches. Professional boxing currently recognizes 17 distinct weight classes, ranging from the minimumweight division to the heavyweight division, which has no upper limit. In all title fights, these weight limits must be strictly observed to maintain the integrity of the competition.12