The rules are broadly similar but each organization brings its small changes according to the will of the athletic commission in the country where the event occurs.
In general, the fighters were not allowed to hit the opponent in the genitals, pulling hair or biting.
The blows of knees, elbows and kicks to the face or elsewhere are generally allowed.
There are several weight classes, but they differ from one organization to another.
How to win a fight are the same in all organizations.
The category of weight are as follows:
| Flyweight | 125 lb | 57 kg |
| Bantamweight | 135 lb | 61 kg |
| Featherweight | 145 lb | 66 kg |
| Lightweight | 155 lb | 70 kg |
| Welterweight | 170 lb | 77 kg |
| Middleweight | 185 lb | 84 kg |
| Light Heavyweight | 205 lb | 93 kg |
| Heavyweight | 265 lb | 120 kg |
| Super Heavyweight | No upper weight limit | |
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