Glossary of Judo terminology

Weight class

Weight class

The "Weight division" rule is used in fighting contests such as Judo and boxing, etc., to prevent a weight-difference handicap by ensuring that a contestant will face an opponent of similar weight.
The weight division concept was initially opposed by Judo traditionalists who felt it was inappropriate to Judo's creed of "Ju yoku go wo seisu" (Softness subdues hardness), but world opinion prevailed, and the current "weight division" categories were added to the original "open weight division".
Although the weight regulations and rankings have been adjusted several times, the current weight divisions as of 2009 are as follows.
Men: 60kg or less, 66kg or less, 73kg or less, 81kg or less, 90kg or less, 100kg or less, over 100kg, and the "open weight division".
Women: 48kg or less, 52kg or less, 57kg or less, 63kg or less, 70kg or less, 78kg or less, over 78kg, and the "open weight division".