Mixed martial arts weight classes

Mixed martial arts weight classes are weight classes that pertain to the sport of mixed martial arts.

Prior to state sanctioning, weight classes were not mandatory since the competitions were held without the approval of the athletic commissions. For instance, the Ultimate Fighting Championship introduced two weight classes at UFC 12: heavyweight, which grouped competitors above 200 lb (91 kg), and lightweight, which grouped competitors under 200 lb.

Weight divisions underwent many changes in the ensuing years, but the ability of promotions to autonomously decide their own weight classes eventually disappeared after athletic commissions began supervising mixed martial arts.

In 2000, the Unified Rules of Mixed Martial Arts were codified by the New Jersey State Athletic Commission. The California State Athletic Commission had worked extensively on regulation, but their sanctioning of MMA was not implemented due to state governmental issues surrounding the process. California officially sanctioned MMA on December 28, 2005, using the ruleset it helped devise five years previously.

Since then, to create uniformity, all state commissions in the United States that regulate mixed martial arts have assimilated these rules into their existing unarmed combat competition rules and statutes. For a promotion to hold mixed martial arts events in a state-sanctioned venue, the promotion must abide by the state athletic commission's body of rules for weight limits.

The Unified Rules designate limits for ten different weight classes in mixed martial arts; all definitions and measurements are in pounds. The strawweight class was added in 2015.

Athletic commissions and promotions usually allow a 1 lb grace limit for non-title fights.

With no state or government laws regarding weight class restrictions, organizations in other countries are free to schedule bouts with little regard for weight differential. However, due to the increasingly competitive and international nature of the sport, weight limits have been set by the promotions themselves usually in alignment with the Unified Rules, as maintaining standard weight classes is seen as fair and standard for all competitors.

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