MMA Weight Classes Explained: Full Division List

Mixed martial arts uses nine standard weight classes under the Unified Rules of MMA, from strawweight at 115 lb (52.2 kg) up to heavyweight at 265 lb (120.2 kg). That ladder is the one the UFC and most US athletic commissions follow, though other promotions run their own systems, and men and women compete on the same limits with different active divisions.

MMA weight classes matter more than in many sports because size advantages translate directly into striking power, takedown force and grappling control. Getting the match-up right is a safety issue. Here is the full standard ladder in pounds and kilograms, plus how the major promotions diverge from it.

The standard MMA weight class table

These are the nine active divisions defined by the Unified Rules of MMA, the framework North American commissions enforce and the UFC adopts.

Division	Weight limit
Strawweight	115 lb (52.2 kg)
Flyweight	125 lb (56.7 kg)
Bantamweight	135 lb (61.2 kg)
Featherweight	145 lb (65.8 kg)
Lightweight	155 lb (70.3 kg)
Welterweight	170 lb (77.1 kg)
Middleweight	185 lb (83.9 kg)
Light heavyweight	205 lb (93.0 kg)
Heavyweight	265 lb (120.2 kg)

The rules also list an atomweight at 105 lb (47.6 kg) and a super heavyweight above 265 lb, but both are rarely used in major MMA, which is why the practical count is nine.

The Unified Rules are the backbone

Most of what fans think of as “MMA weight classes” is really the Unified Rules of MMA, drafted by the Association of Boxing Commissions and adopted by state athletic commissions across the United States. Because the UFC operates largely under those commissions, its divisions track the standard closely. Our UFC-specific breakdown covers exactly which of these classes the promotion runs for men and women, including why it has no men’s strawweight.

A fighter must hit their division’s limit at the weigh-in, with a one-pound allowance for non-title bouts and no margin for championship fights. Miss the limit and the standard penalties apply — a forfeited slice of the purse and, for a champion, the risk of being stripped on the scale.

Not every promotion agrees

The Unified Rules are dominant but not universal. ONE Championship, the largest promotion outside North America, uses a fundamentally different approach: fighters are weighed by their hydrated “walking weight” and monitored so they cannot strip large amounts of water before a fight. Because of that, ONE’s division names sit at heavier real weights than their Unified Rules equivalents — a ONE lightweight is bigger than a UFC lightweight.

Then there are catchweights. When a fighter cannot make a class limit, when two athletes from neighbouring divisions want to meet, or when a bout is booked on short notice, promoters set a catchweight — a one-off contracted weight between two standard classes. Catchweight fights do not count toward a title and are an agreement rather than an official division.

Men and women share the ladder

The pound limits are identical for men and women; what differs is which divisions each has the depth to sustain. Women’s MMA clusters in the lighter classes — atomweight, strawweight, flyweight and bantamweight see the most action — while men’s rosters populate the middle and upper bands all the way to heavyweight. A women’s bantamweight and a men’s bantamweight make the same 135 lb; there simply are not enough female heavyweights for that division to run.

Hitting these limits is a craft in itself, and the harder a fighter pushes toward a lower class the more they lean on the weight-cutting methods common across combat sports. Once inside the cage, how those fighters are judged over three or five rounds is a separate question our guide to how MMA scoring works answers.

For a look at the athletes who dominated these divisions without a blemish, our roundup of undefeated UFC fighters tracks the perfect records across the weight ladder.

The short version: MMA runs nine standard weight classes from 115 lb to 265 lb under the Unified Rules, shared by men and women, with heavyweight capped at 265 lb — while promotions like ONE Championship use different, hydration-tested bands.