IJF

Athletes must bring both a white judogi and a blue judogi to competition. The color is assigned by draw: the first-called competitor wears white, the second wears blue.

Key Fact: Judokas must bring both white and blue judogis to competition.

Fingernails and toenails must be cut short to prevent injury.; Long hair must be tied back so it does not obstruct the opponent's face or interfere with gripping.; Hard objects (rings, piercings, bracelets, watches) are strictly prohibited during competition.

Scoreboard: Electronic scoreboard visible to athletes, coaches, and spectators displaying scores, penalties, osaekomi time, and match clock.; Video Review System: The IJF CARE (Computer Assisted Referee Evaluation) system provides instant video replay to assist referees on contested calls.; Timin...

All IJF-sanctioned competitions take place on a regulation tatami (competition mat) meeting the following dimensional requirements: Total Platform: Minimum 14 m × 14 m (46 ft × 46 ft), encompassing the contest area, danger zone, and safety zone.; Contest Area: 8 m × 8 m (26 ft × 26 ft) to 10 m × ...

Competition takes place on a regulation tatami mat.

Tatami mats must be IJF-approved, constructed from high-density foam (typically EVA or compressed polyurethane) with a textured, non-slip vinyl surface. Mat firmness must allow safe breakfalls (ukemi) while providing enough friction to prevent uncontrolled sliding.

Minimum ceiling height of 4 m (13 ft) above the mat surface.; Adequate lighting of at least 1,500 lux at mat level for competition and broadcast requirements.; Warm-up area adjacent to the competition hall with sufficient mat space for athletes to prepare.

Individual and team events. Weight categories: Men (60 kg, 66 kg, 73 kg, 81 kg, 90 kg, 100 kg, +100 kg), Women (48 kg, 52 kg, 57 kg, 63 kg, 70 kg, 78 kg, +78 kg).

Individual events are contested in seven weight categories per gender.