At the present time, the leading Martial Arts Tournament Asia ONE Championship has a total of 23 weight classes both men and women, including 3 main competition formats: MMA, Muay Thai and Kickboxing.
With a very different weight system compared to other tournaments in the world, the maximum weight of a ONE Championship boxer is much higher than the boxers in UFC, Rizin, Shoolo or Bellator. Specifically, the weight of each weight class at One is prescribed as follows:
| Weight | Limit | Male – Female | Formula |
| Heavyweight | 102.2 – 120.2 kg | Male | MMA |
| Light Heavyweight | 93.1 – 102.1 kg | Male | MMA – Kickboxing |
| Middleweight | 84.0 – 93.0 kg | Male | MMA |
| Welterweight | 77.2 – 83.9 kg | Male | MMA |
| Lightweight | 70.4 – 77.1 kg | Male | MMA – Kickboxing |
| Featherweight | 65.9 – 70.3 kg | Male | MMA – Kickboxing – Muay Thai |
| Bantamweight | 61.3 – 65.8 kg | Male | MMA – Kickboxing – Muay Thai |
| Flyweight | 56.8 – 61.2 kg | Male | MMA – Kickboxing – Muay Thai |
| Strawweight | 52.3 – 56.7 kg | Male – Female | MMA – Kickboxing – Muay Thai |
| Atomweight | 47.7 – 52.2 kg | Female | MMA – Kickboxing – Muay Thai |
The laws in controlling the weight of the boxer at One Championship:
1. Martial artists must monitor their daily weight, fill in the results of the martial artist weight monitoring table on the Web Portal port of ONE Championship.
2. The weight class of the boxer will be determined by the average weight data that the boxer sent to One, accompanied by the results of the random inspection. The boxer was not allowed to lose weight a new weight within 8 weeks before the match.
3. In the week of the match, the weight was tested daily. The amount of urine will also be randomly checked during the preparation of the boxer of the boxer, from weeks to 3 hours before the match. Doctors may request further examination.
4. Catchweight matches can take place if the boxer is not over 105% of the opponent's weight.
5. ONE Championship will have unexpected tests for the weight of the boxer.
6. Martyrs may request to change to another weight within 8 weeks before the match, but they have to reach the weight of the new weight class in the time of notification to One.
7. Absolutely prohibit water transmission through intravenous injection (IVS) to compensate for the body.
8. Scope of the weight of the boxer:
– 3 weeks before the match: must be within the weight of the weight class.
– 4 weeks before the match: It is more than 1.5% of the maximum weight of the weight class.
– 5 weeks before the match: It is allowed more than 3% of the maximum weight of the weight class.
– 6 weeks before the match: It is allowed for more than 4.5% of the maximum weight of the weight class.
– 7 weeks before the match: It is allowed to exceed 6% of the maximum weight of the weight class.
– 8 weeks before the match: It is more than 6% of the maximum weight of weight.