Rules & weight classes
Rules & weight classes
Division tables, commission and federation rules, weigh-in formats and missed-weight penalties.
Weight classes in the ABC Unified Rules of Mixed Martial Arts, revision 8.2026 — four more than most published tables carry
ABC, Unified Rules of Mixed Martial Arts, rev. 8.2026, amendments approved 5 August 2026
Weight classes Nevada's regulation actually schedules — four Unified Rules divisions have no Nevada equivalent
NAC 467.7956, last amended R032-18, effective 30 January 2019
Urine specific gravity ONE Championship requires an athlete to pass before being permitted onto the scale
ONE Championship, Martial Arts rules page, checked 24 August 2026
Weight classes are not a single table, and treating them as one is the most common way a fighter ends up on the wrong side of a rule. The division names are shared; the limits, the allowances and the weigh-in formats belong to whoever is sanctioning the bout.
The scale of the disagreement surprises people. The ABC Unified Rules of Mixed Martial Arts list 15 weight classes as of revision 8.2026. Nevada's own regulation schedules 11 — super lightweight, super welterweight, super middleweight and cruiserweight have no Nevada equivalent at all. MMA weight classes explained works through which table applies to you and when, and boxing weight classes explained does the same for a sport with four sanctioning bodies and no single answer.
Format matters as much as the number. A day-before weigh-in and a same-day weigh-in are different problems with different acceptable cuts, and hydration testing changes the calculation again — ONE Championship requires a urine specific gravity at or below 1.025 before an athlete is permitted onto the scale. How an MMA weigh-in works, how a wrestling weigh-in works and hydration testing at weigh-ins cover the procedure rather than the theory, down to whether clothes count.
Wrestling deserves its own note because it is the one discipline that regulates the descent itself rather than only the destination. Wrestling weight certification explained covers the minimum-weight process, and high school and college weight classes carry the tables. And when it goes wrong, missing weight in MMA sets out what actually happens.
Articles
How an MMA weigh-in works
The Unified Rules of MMA set no weigh-in time at all. Here is what nine commission documents actually require, and what the ceremonial weigh-in is worth.
October 2, 2026 · 21 min read
Rules & weight classesHow a wrestling weigh-in works
What actually happens at a wrestling weigh-in: the clock, the skin check, attempts on the scale, attire, allowances and what a miss costs, per rulebook.
October 1, 2026 · 19 min read
Rules & weight classesDo clothes count at a weigh-in?
No rulebook we read grants a two-pound clothing allowance. What UWW, the NCAA, NFHS, the IJF, the IBJJF, Nevada and California actually require on the scale.
September 30, 2026 · 21 min read
Rules & weight classesReturning to training after a knockout
A commission suspension is an administrative minimum, not a medical clearance. What New York, California, Virginia and Nevada actually say, verified at source.
September 29, 2026 · 22 min read
Rules & weight classesADCC weight classes and weigh-in rules, explained
ADCC moved weigh-ins from same-day to the day before in 2023. The current weight classes, the 0.5 kg allowance, and what changed for women at the 2026 Worlds.
September 27, 2026 · 24 min read
Rules & weight classesCollegiate wrestling weight classes, 2026-27
The 2026-27 college wrestling weight classes for NCAA men and women, NAIA and NJCAA, with kilogram conversions, weigh-in timing and the weight-management rules.
September 21, 2026 · 21 min read
Rules & weight classesHigh school wrestling weight classes for 2026-27
Every NFHS boys' and girls' wrestling weight class for 2026-27, the 12 and 13-class options, state growth allowances, weigh-in windows and the new 19% rule.
September 20, 2026 · 22 min read
Rules & weight classesJudo weight classes and the random weigh-in
Judo regulates the rebound, not the cut. The IJF categories, the 16:00 weigh-in, and the 5% random weight check on competition morning, quoted from the rulebook.
September 1, 2026 · 19 min read
Rules & weight classesMuay Thai weight classes and weigh-ins
The professional and amateur Muay Thai ladders are different systems with different weigh-ins. The WBC and IFMA rulebooks, quoted exactly, and where they diverge.
September 1, 2026 · 19 min read
Rules & weight classesWrestling weight certification, explained
Wrestling regulates the floor of a weight cut, not the day of it. The NCAA and NFHS rules, quoted exactly, with the body-fat numbers most sources get wrong.
September 1, 2026 · 20 min read
Rules & weight classesMissing weight in MMA: what actually happens
The hour at the scale, the purse forfeit, the catchweight and the belt: what missing weight actually triggers in MMA and boxing, and who decides each part.
August 28, 2026 · 22 min read
Rules & weight classesBoxing weight classes explained
Every professional boxing division in lb and kg, read from the WBC, WBA, IBF and WBO rulebooks — including the four places they openly disagree.
August 27, 2026 · 27 min read
Rules & weight classesMMA weight classes explained
The ABC recognises fifteen MMA divisions, Nevada schedules eleven and the UFC ranks eleven. Exact limits in lb and kg, from the August 2026 rulebook.
August 24, 2026 · 22 min read
Questions fighters ask
How many weight classes are there in MMA?
Fifteen in the ABC Unified Rules of Mixed Martial Arts as of revision 8.2026 — but that is the model rule set, not the law where you fight. Nevada schedules 11, with no equivalent for super lightweight, super welterweight, super middleweight or cruiserweight. The table that binds you is the commission’s, not the ABC’s.
How much weight allowance do you get at a weigh-in?
It depends on the jurisdiction and on whether the bout is for a title. New York codifies a one-pound allowance for non-championship bouts and states explicitly that championship bouts get none. Other commissions differ, and some give nothing at all, so this is a question to answer from the rule that applies to your card rather than from a general figure.
What happens if a fighter misses weight?
Typically a purse forfeiture to the opponent, a catchweight bout if the opponent accepts, loss of title eligibility, and in some jurisdictions commission discipline. The specifics are set by the commission and the contract rather than by a universal rule.
What is wrestling weight certification?
A process that sets the lowest weight class an athlete may compete at, based on a body-composition assessment and a permitted rate of descent. It is unusual among combat sports in regulating how fast the weight comes off rather than only where it ends up, and it is administered by state and national associations whose rules differ.
Do your clothes count at a weigh-in?
It depends on the rule set, and the answer is more consequential than it sounds when the allowance is a pound. Some sanctioning bodies weigh athletes in underwear, some permit a singlet with a stated allowance, and some leave it to the official. Fighter Cut has an article on where each convention applies.