Do clothes count at a weigh-in?

The short answer, sport by sport

If you want the one line for your sport, it is here. Everything after this section is the document it comes from.

In mixed martial arts, the Unified Rules say nothing at all, so the answer is whatever your commission's regulation says. In Nevada, you may keep shorts on, and a top if you are female, with all weights stripped from the body. In California, the regulation says weights are taken with contestants stripped. In amateur boxing under World Boxing, the displayed weight counts with the body naked or in underwear only. In USA Boxing, undergarments and a female sport hijab are permitted, and boxers over 18 may remove their underwear while under-18s may not weigh in naked at all. In United World Wrestling, you wear the competition singlet and nothing is deducted for it. In NCAA wrestling, a suitable undergarment is the minimum and no clothing allowance exists. In NFHS high-school wrestling, a legal uniform is required with no additional weight allowance granted. In judo, underclothing only, removable on the scale for seniors, with 200 g added for cadets. In taekwondo, underpants and a bra, nude on request, with 100 g for cadets and juniors. In IBJJF jiu-jitsu, you weigh in wearing the gi and belt you will compete in, in full, against the division limit.

Four of those bodies disagree with each other about what a competitor may wear. None of them disagrees about whether it counts.

Where the two-pound belief actually comes from

The myth has two parents, and both of them are real rules that say something else.

Parent one is Nevada. NAC 467.7956, the mixed martial arts weight-class section, says at subsection 2 that "After the weigh-in of an unarmed combatant competing in a contest or exhibition of mixed martial arts, weight loss in excess of 2 pounds is not permitted", and at subsection 3 that "The weight loss described in subsection 2 must not occur later than 1 hour after the initial weigh-in." The section was last amended 30 January 2019.

The same rule exists in boxing, one section of the same chapter away, and it is routinely left out of accounts of this myth. NAC 467.476, subsections 3 and 4: "After the time of the weigh-in, weight loss in excess of 2 pounds is not permitted. The weight loss described in subsection 3 must not occur later than 1 hour after the initial weigh-in." So Nevada caps post-weigh-in loss at two pounds in both sports, each with a one-hour clock. The third rule in that family, NAC 467.522(3), opens with "Except as otherwise provided in subsection 3 of NAC 467.476 and subsection 2 of NAC 467.7956", which is how the three fit together.

Read the words. This is a limit on how much a fighter may shed after stepping off the scale — an anti-manipulation rule aimed at combatants who weigh in, then keep cutting. It is not an allowance, it is a ceiling, and it applies to the athlete's body rather than their kit.

Parent two is high-school wrestling. The NFHS supplies a two-pound growth allowance that is added to every weight class, for the ordinary reason that a fifteen-year-old in February is not the same size as the same fifteen-year-old in November. Crucially, the date is not national. State associations set it: 1 January in California and Utah, 25 December in New York and Ohio. The amount is two pounds everywhere we checked; the date is not, and any article that prints one date as a national fact is wrong.

Notice the direction. The growth allowance is added to the class limit, making the class two pounds roomier for everyone. It is not subtracted from a wrestler's reading to account for a singlet. The arithmetic looks similar from a distance and is a different rule entirely.

Put those two together — a two-pound number in combat sports, another two-pound number in wrestling, both adjacent to a scale — and you get "there's a two-pound allowance for your clothes". There is not. If you are planning descent to a limit, plan it to the limit with your kit on, and if you want the week structured properly, the plan should be built to the limit, not to folklore about the scale.

Mixed martial arts: the Unified Rules are silent

The ABC Unified Rules of Mixed Martial Arts contain no weigh-in attire rule, no weigh-in timing rule and no hydration test. That is a documented absence, not an oversight in our reading, and here is the method: we fetched the nine-page PDF published by the Association of Boxing Commissions and Combative Sports — the version last amended 6 August 2025 with non-substantial changes — and ran a case-insensitive full-text search across the whole document.

The word "scale" returns zero hits. So do "nude", "naked", "garment", "apparel" and "uniform". The pattern hydrat|gravity|dehydr returns zero hits, which means there is no hydration test and no specific-gravity requirement anywhere in the Unified Rules; any such protocol you have encountered belongs to a commission or a promotion, never to "the Unified Rules". And there is no weigh-in timing rule at all: no 24-hour requirement, no 36-hour requirement, no "morning of".

The one hit for "attire" is § 11, "Cage/Ring Attire", and it governs the fight rather than the scale: male contestants may not wear clothing on the upper body, and competitors wear the appropriate trunks, mouthpiece and gloves. That is a rule about what you compete in.

What the Unified Rules do govern, on the subject of weight, is classes and spreads. They recognise fifteen divisions from Atomweight (up to 105 lb) to Super Heavyweight (over 265 lb). They state that there are no allowance restrictions where both combatants weigh in within the same contracted division; that where one misses the contracted weight and the two are in different classes, the heavier opponent shall not exceed five pounds above the lower-weighing fighter; and that contracted catch-weight bouts carry no weight spread allowance so long as both are below the contracted weight, with commissions free to deny a catch-weight bout on safety grounds.

So in MMA, the answer to "what may I wear on the scale" is not in the sport's rulebook. It is in your commission's administrative code.

Nevada and California give opposite answers

Nevada's rule is permissive. NAC 467.514, "Procedure for weigh-in", subsection 4: "The unarmed combatant must have all weights stripped from his or her body before weighing in, but may wear shorts and, if the unarmed combatant is female, a top." The section carries statutory authority under NRS 467.030 and 467.155 and was last amended 30 January 2019.

The rest of 467.514 is worth knowing if you compete in Nevada. The weigh-in happens in public, in front of the opponent, a Commission representative and a promoter representative. Scales must be examined and approved by the Chief Inspector, and independently calibrated with proof supplied before the weigh-in starts. The Commission may require a combatant to be weighed more than once.

California's regulation is the opposite. Title 4 of the California Code of Regulations, § 297, "Weighing Time", in full: "Contestants shall be weighed within 30 hours of the scheduled match, at a time and place designated by the commission, in the presence of a commission representative on scales approved by the commission. A club may obtain advance written permission of the commission to allow preliminary boxers to weigh in and be examined not later than one hour before the scheduled time of the first match on the card. All weights shall be taken with the contestants stripped." Authority: Business and Professions Code § 18611. The amendments took effect 12 July 2017, Register 2017 No. 28.

One step is needed to get that from boxing to MMA, and it is worth showing rather than assuming, because § 297 sits in Chapter 1 of Title 4, "Professional Boxing Rules". Chapter 2 covers full contact martial arts and kickboxing, and § 501 applies that chapter to professional martial arts contests, defining "martial arts" as unarmed full-contact martial arts permitting a mix of techniques including chokeholds, joint manipulation and grappling. Section 502(a) then reads: "Unless otherwise specified in this chapter, all of the professional boxing rules apply to martial arts contests or matches except the following" — and the list of exceptions runs §§ 242, 298, 306, 309 through 313, 322, 337, 338, 339, 349 through 351, 357, and 400 through 416. Section 297 is not among them. The weighing rule carries across; § 298, the weights-and-classes rule immediately after it, does not.

Two of the largest commissions in American combat sport, regulating the same question, reaching different answers. That is the honest state of MMA weigh-in attire, and it is why photographs of fighters in shorts on a Nevada stage tell you nothing about what happens in Sacramento. Do not generalise from a broadcast image.

Neither state's code contains a hydration rule at the weigh-in, incidentally: a case-insensitive search of the whole of Nevada NAC chapter 467 for hydrat|dehydr|specific gravity returns zero hits. California does have a permissive provision elsewhere in its Article 6, which we did not fetch in full. If that is your question, hydration testing at weigh-ins treats it properly.

Amateur boxing: naked or underwear, and a safeguarding line for minors

World Boxing's competition rules, in force November 2024, state the principle plainly at § 5.6.4: "With the body being naked or using only underwear, the weight displayed on the scale is the Boxer's official weight." There is no deduction and no tolerance. The surrounding clauses set the shape of the event: weigh-ins generally take place in the mornings during competition days and boxers make weight on the day they box (5.6.1); a boxer is allowed to be present at the official scales only once (5.6.3); exceeding the maximum limit of the weight category results in a walkover in favour of the scheduled opponent (5.6.5).

One clause in that section almost never appears in articles on this subject. Rule 5.6.6: at a boxer's first official weigh-in of a competition, the weight must exceed the minimum limit of the category. Amateur boxing polices being under weight as well as over it, which changes what a marginal cut means — dropping a division is not simply a question of getting light enough.

USA Boxing's national rulebook, effective 1 January 2025, writes the same principle with an age gate. Rule 11.1(11), "Scale": "The weight is the one shown on the scale, the body being naked except for undergarments and female sport Hijabs. No boxer under the age of 18 may weigh-in naked. When necessary, a boxer over the age of 18 may take off their underwear; however, prior to the removal of their underwear the weigh-in area must be cleared of all boxers under the age of 18. An official scale must be used."

That is the most consequential sentence in the amateur section, and it is a safeguarding rule rather than a weight rule. Its effect, though, is a weight effect: a seventeen-year-old's underwear genuinely counts against the limit, because they are not permitted to remove it, while an eighteen-year-old's need not. Unlike judo and taekwondo, USA Boxing attaches no compensating grams to that difference.

The same rule set adds that at the daily weigh-in only the maximum weight limit is controlled; that a boxer may be present at the official scales only once; that no body jewellery or body accessories may be worn; and that test scales must be available and calibrated the same as the official scales.

One currency caveat, stated plainly: the copy we read was a Local Boxing Committee mirror of the 1 January 2025 rulebook, and USA Boxing separately publishes a revisions list dated 1 January 2026 that we did not obtain. Treat the 2025 text as the text we verified, not as certainly the latest.

Professional boxing is a commission matter. We did not fetch a WBC, WBA, IBF or WBO rulebook clause on weigh-in attire and cannot confirm from a primary document that any of them has one. Do not assume a sanctioning body sets what you wear on the scale; in the United States, the state commission regulation and the bout agreement do that work. Nevada's NAC 467.522(3) adds the genuine one-pound grace that exists in pro boxing, and it is not about clothes either: "if, during the 1 hour following the time of weighing in, an unarmed combatant is able to make the weight or weighs 1 pound or less outside the agreed limits, no forfeit may be imposed or fine assessed upon him or her." That is a purse-forfeiture rule with a one-hour window, last amended 9 September 2016.

Olympic wrestling: the singlet is required and nothing is deducted for it

United World Wrestling writes the clearest "no allowance" clause in combat sport, and it writes it immediately after requiring the garment. Article 11 of the International Wrestling Rules — Greco-Roman, Freestyle, Women's Wrestling, footer-dated January 2026: "The only uniform allowed for the weigh-in is the correct singlet." Then, two sentences later: "No weight tolerance will be allowed for the singlet."

Read together, those clauses mean a world-level wrestler makes the limit with the singlet on, with nothing subtracted, whatever it weighs. The article adds that referees will refuse to weigh a wrestler wearing an altered singlet, and that the medical control performed alongside the weigh-in is a screen for contagious disease — physicians "are obliged to eliminate any wrestler who presents any danger of contagious disease" — not a hydration test. A full-text search of the January 2026 rulebook returns no hydration or specific-gravity requirement at all.

The format: "For all competitions, the weigh-in is organized each morning of the concerned weight-category. The weigh-in and the medical control lasts 30 minutes." On the second morning, only wrestlers in the repechages and finals weigh in, and that session lasts fifteen minutes. Missing or failing either weigh-in means elimination and being ranked last, without rank.

And one widely repeated claim about UWW is simply false. There is no two-minute rule and no limited number of attempts. The rulebook says the opposite, verbatim: "Throughout the entire weigh-in period, wrestlers have the right, each in turn, to get on the scale as many times as they wish." Thirty minutes on the first morning, fifteen on the second, unlimited mounts of the scale in turn. We searched the extracted text for "two minutes" and "2 minutes": the single hit is in Article 22, bout duration for U15, U17 and veterans, and has nothing to do with the weigh-in.

There is a tolerance in UWW, and its scope matters. It is written in the competition-format section on page 9, not in Article 11, and it is two consecutive sentences there: "No more weight tolerance will be allowed for the second weigh-in." Then: "2kg weight tolerance is allowed for World Cup, UWW Ranking Series Tournaments and for the International Tournaments." So the 2 kg applies to those event categories only. It is not available at the Olympic Games, the World Championships or the Continental Championships, and it never applies to the second weigh-in.

That combination is the sharpest fact in this article. At the highest level of Olympic wrestling, you must wear the singlet, nothing is deducted for it, and no tolerance is available.

NCAA wrestling: a garment is mandatory, and the only allowance is a scheduling one

The 2025-26 and 2026-27 NCAA Men's Wrestling Rules, printed August 2025, require clothing and grant nothing for it. Rule 9, Weigh-Ins, Article 5, "Undergarments": "All wrestlers shall weigh in wearing a minimum of a suitable undergarment, such as briefs, boxers, shorts or competition singlet. A garment shall not be altered and shall cover the entire buttocks."

Article 15 adds a condition that catches athletes out more often than the attire rule does: "At the scheduled time for medical examinations and weigh-ins, all wrestlers who wish to compete shall present themselves properly groomed, in a suitable undergarment and not be engaged in any weight loss activity." Sweating in the corridor is itself a rules problem, independent of the reading on the scale.

Article 4 sets the setting: "Weigh-ins shall be conducted in a private, secured area at the site of competition or in an adjacent building to the competition, and attendance shall be limited to the wrestlers, coaches of the wrestlers, required medical personnel, the person(s) supervising the weigh-in…" Contrast that with Nevada, where the regulation requires the weigh-in to be public. Two sports, opposite instincts about who watches.

The NCAA does grant one allowance, and it is about the calendar rather than the kit. Rule 9.3.2, expanded as a listed 2025-27 rules change: "In all instances when back-to-back team competition occurs, all wrestlers shall receive a 1-pound weight allowance on the second day of competition. Additionally, if a team competes in dual meets within a 48-hour window (measured by event start time), all wrestlers shall receive a 1-pound weight allowance for the subsequent dual within that window… The maximum weight allowance is 1 pound regardless of the number of back-to-back events that occur… The 1-pound weight allowance will not alter a wrestler's weight-loss descent plan for subsequent weigh-ins."

One pound, for wrestling twice inside two days, capped no matter how many events stack up, and explicitly not a licence to redraw the descent plan. It is not for your singlet.

Two further Rule 9 provisions are worth having: "No team shall weigh in more than once per day", and the missed-weight procedure, under which a wrestler who fails may, after everyone else has weighed, be escorted to each additional official scale and weigh once per scale, with failure on all of them meaning disqualification.

The documented absence here is straightforward: the NCAA men's book states no clothing allowance and contains no sentence granting one. If you wrestle collegiately, college wrestling weight classes covers the divisions those rules apply to.

The NCAA women's rulebook is a separate publication — the NCWWC Rule Book & Guide to Women's Wrestling — which we located but did not read. Do not assume the men's wording transfers.

NFHS high-school wrestling: a legal uniform, and no additional allowance

The NFHS rewrote rule 4-5-7 for the 2020-21 season specifically to close this question. In its own announcement of the change, dated 28 April 2020, the federation states that "Rule 4-5-7 was rewritten to require that a legal uniform be worn during weigh-in and that no additional weight allowance be granted." The same paragraph adds that "an additional clause prohibiting shoes and ear guards during weigh-in was also written into 4-5-7."

That is the clearest possible statement of the principle for high-school wrestling: uniform on, shoes off, nothing granted for it.

The release is explicit that the rewrite was driven by inclusion rather than by weight. It followed an amendment to rule 4-1-1c permitting female wrestlers to wear a form-fitted compression shirt covering the breasts in addition to a one-piece singlet and a suitable undergarment, and weighing in under a legal uniform is what let the committee merge the separate male and female weigh-in lineups written into rules 4-5-1, 4-5-2 and 4-5-4. The federation's stated benefit for skin checks is narrower than it is usually reported: the compression shirt, it says, "offers females a more suitable uniform for post-weigh-in skin checks, which are typically done by male officials."

We have to be careful about what we can say next. The NFHS Wrestling Rules Book is a paid publication and we could not read the current 4-5-7 text verbatim. Everything above comes from the federation's own free announcement of the change, not from the rule as printed today.

Nor can we tell you the rule is unchanged. NFHS approved eighteen wrestling rules changes for 2026-27. Its own release of 16 April 2026 names only a handful — a change to the minimum body-fat percentage for females, among others — and states that a complete listing will be available on its website. One announced change does touch weigh-ins: an opportunity to weigh in by team where that is more practical, published without a rule number. Nothing NFHS has announced changes weigh-in attire. That is a statement about what has been published, not a verified absence in the rule text, and we are not going to dress it up as one.

The commonly quoted attire wording — a legal uniform and a suitable undergarment completely covering the buttocks and groin, with female contestants additionally in a form-fitted compression undergarment completely covering the breasts — appears in state-association reproductions of the NFHS rules rather than in a free NFHS primary source. Treat it as secondary.

The two-pound growth allowance is real, and it is the half of the myth worth understanding properly. It is added to every weight class, for seasonal adolescent growth, on a date each state association sets: 1 January in California and Utah, 25 December in New York and Ohio. The amount was two pounds in every state handbook checked; the date was not. If you coach across state lines, that single fact will save you an argument. For the divisions it applies to, see high school wrestling weight classes.

Judo: the only federation that lets you strip on the scale, and prices underwear at 200 g

The IJF Sport and Organisation Rules, version 14 August 2026, § 6.2.4: "Athletes must weigh in wearing only underclothing: Men: underpants, optionally a vest top. Women: underpants and a bra or vest top. All head coverings, watches, glasses, socks, jewelry, and body piercings must be removed. Athletes may remove underclothing without stepping off the scales to meet the weight limits of their category. Each athlete may stand on the scales only once during the official weigh-in period. The supervising official will record the weight in kilograms to one decimal place (e.g., 51.9 kg, 73.0 kg)."

"Without stepping off the scales" is the most revealing clause in this entire article. The IJF has anticipated the exact moment — a senior judoka a few hundred grams over, standing on the platform — and written into the rules that the underwear is the last thing between them and the category. That is a federation acknowledging in legislation that clothing counts.

Cadets are the exception, and the exception is priced. § 6.1: "Athletes competing in cadet events are NOT allowed to remove their underclothing (men must wear underpants and optionally a vest top and women must wear underpants and a bra or vest top); to compensate an additional 200 g / 0.2 kg will be allowed i.e., for the category -44 kg the limit will be -44.2 kg." Every cadet table in the SOR is printed twice — once at the bare limit, once annotated "Includes 0.2 kg for underwear."

Two hundred grams. That is the largest clothing allowance any regulator in this file has ever set, it exists only because minors are protected from stripping, and it is roughly a tenth of what the folklore claims.

The rest of the IJF weigh-in regime is unusually specific and worth knowing. The official weigh-in is scheduled one day before competition at 16:00 local time and lasts 30 to 60 minutes. An unofficial weigh-in on the official scales opens 40 minutes before it and closes 10 minutes before, with unlimited attempts. Test scales must be available in every official hotel from 08:00 to 22:00 daily, in a private room. Scales display one decimal place, with extra digits taped over. Photography in the weigh-in area is prohibited and staff must be the same gender as the athletes. Failure to make weight is disqualification and exclusion.

Judo also runs a random weigh-in, which changes the whole calculation of what a cut buys you. On the IJF World Judo Tour, it opens one hour before the start of competition each day, with a 30-minute or six-contest deadline, and: "The weight of the athlete cannot be more than 5% higher than the official maximum weight limit of the category." Four athletes per category are drawn by software an hour before the start, and failing means exclusion. Judo weight classes and the random weigh-in goes through that in detail.

Taekwondo: nude on request, 100 g for minors

World Taekwondo's competition rules, in force as of 1 June 2026, reach the same place as judo from the opposite direction. Article 9.3: "During the weigh-in, the male contestant shall wear underpants and the female contestant shall wear underpants and a brassiere. However, weigh-in may be conducted in the nude if the contestant wishes to do so." Article 9.3.1: "Cadet and junior contestant must be weighed with underwear(s) and 100 grams will be allowed to compensate."

So: adults may strip on request, minors may not, and minors get a hundred grams for it. The IJF forbids cadets from stripping and gives them two hundred. Two federations, two official prices for a pair of underpants, differing by a factor of two. Nobody has published the measurement either figure is based on.

The rest of Article 9: the general weigh-in is the day before, lasting a maximum of two hours. A random weigh-in takes place on the morning of competition; everyone who passed the general weigh-in must attend, it is completed at the latest 30 minutes before the start, and failure to appear is disqualification. Selection rates are set by field size — 20% of the total where more than 32 athletes are entered, six for 17 to 32, four for 9 to 16, two for 4 to 8, none below four. The random weigh-in runs with a plus 5% tolerance, and underweight athletes are not subject to it. The general weigh-in is made once, with one further attempt granted inside the time limit to a contestant who did not qualify first time; the random weigh-in is made only once, with no second attempt. Identical practice scales must be provided at the athletes' hotel or the venue.

We did not fetch a current World Karate Federation rules document, so karate is absent from this article rather than guessed at.

Brazilian jiu-jitsu: the sport where clothing unambiguously counts

The IBJJF is the cleanest answer to this article's title question, and it takes three clauses in sequence to see why. All are from the IBJJF Rules Book, version 6.1, June 2024 — the running footer on every page reads "VERSION 6.1 2024", which is the authority even though the download page on ibjjf.com labels the same file v6.0.

8.1.11: "Prior to weighing in, the inspector will verify that the specifications of the uniform meet regulations." The bullets beneath it require collar thickness, collar width, sleeve and pant-leg length and sleeve slack to be measured, and add that the uniform inspector will also verify the overall state of the athlete's belt.

8.3.3: "The athlete cannot step on the scale with shoes or any item besides his/her regular uniform and equipment permitted for use during matches."

8.1.13: "After weighing in, athletes may not change their gis for their first match, under penalty of disqualification."

Read in order, the rulebook describes a single continuous object: the gi and belt are inspected, the athlete steps on the scale wearing that and nothing else, and the athlete may not swap it before competing. In a gi division, the competition uniform is the gi and the belt, and they go on the scale in one go. The rulebook grants no tolerance for any of it — the word "tolerance" returns zero hits across the entire document.

The consequences are practical and specific. A jiu-jitsu competitor's kit is counted in full against the division limit, which is why gi weight is a purchasing decision in that sport and in no other. The belt counts. Rule 8.3.1 adds that each athlete shall mount the official scale only once, so there is no second attempt to strip something off. Rule 8.3.2 makes one narrow concession in the other direction: athletes may weigh in without knee or elbow braces, but must be wearing them at the gi inspection. Rule 8.2.5 has the gi inspector check athletes for skin conditions following the weigh-in. And in a three-athlete bracket, § 2.3.2, an athlete who exceeds the division limit is eliminated from the competition.

Whether an event provides a warm-up scale is discretionary: § 1.3.4 leaves it to the organising committee. Plan on your own scale and your own reading. If that is your competition, weight cutting for BJJ tournaments is the companion piece.

What clothing actually weighs: nobody official will tell you

Here is the gap at the centre of this subject. No governing body in this file publishes a mass figure for its own uniform. UWW, the NCAA, the NFHS, the IBJJF and the IJF all regulate whether clothing counts, in careful language, without ever stating how much it weighs. The rules are precise about the principle and silent about the quantity.

The two exceptions are the ones already given, and they are not measurements of garments so much as administrative prices for them: the IJF's 200 g and World Taekwondo's 100 g, both attached to minors who may not strip. Those are the only regulator-set clothing masses in this entire research file, and they are the figures this article leads with, because everything else on the subject is marketing copy.

For BJJ gis, vendor-published weights cluster roughly between 1.5 and 6 lb (0.7–2.7 kg) depending on fabric GSM, size and weave. A 450 GSM size-A2 gi is advertised by FUJI Sports at about 4.5 lb; Gold BJJ advertises an ultralight A2 at 2 lb 5.7 oz. Those are vendor marketing figures, unverified by any independent measurement, and they include the belt inconsistently. We publish them attributed and labelled rather than as facts, because for a BJJ competitor the difference between the top and bottom of that range is larger than most divisional gaps — and that, not any allowance, is why gi choice is a competitive decision.

The IBJJF regulates weave and thickness rather than mass: v6.1 § 8.1.1 mandates woven or pearl-weave fabric for juvenile, adult and master divisions. The commonly cited "380–650 GSM" band appears in vendor buying guides, not in the clause we read, so we are not printing it as the federation's number.

For a wrestling singlet, no authoritative figure exists. Neither UWW, nor the NCAA, nor the NFHS publishes a mass, and we found no independent measurement. We will not print one. What we can tell you is the rule: UWW forbids any tolerance for the singlet whatever it weighs.

For MMA fight shorts, likewise no authoritative figure. Nevada permits shorts and deducts nothing for them.

If a number for any of these appears in an article without a source, it was invented or copied from a vendor. The honest version is that the quantity is unpublished and the principle is not.

What this means at the scale

Plan to the limit with your kit on. In every rulebook here, the number the official records includes whatever you are wearing, and in most of them you get one attempt.

The single-attempt rule is the part competitors underestimate. World Boxing 5.6.3, USA Boxing 11.1(8), IJF § 6.2.4 and IBJJF 8.3.1 each say the athlete may be present at or mount the official scale only once. UWW is the outlier in the other direction, with unlimited attempts across a 30-minute window, and the NCAA sits in between with a defined re-weigh procedure across additional scales for an athlete who has missed. Knowing which regime you are in changes whether "get on and see" is a reasonable move or a disqualification.

The removable-garment rules are worth reading precisely for the same reason. In judo, seniors may strip on the scale without stepping off, so the underwear is a genuine last resort. In taekwondo, a nude weigh-in is available on request. In USA Boxing, it is available from age 18, after the room is cleared of minors. In NCAA and NFHS wrestling, it is not available at all — a garment is mandatory, and the reading is the reading. In IBJJF gi divisions, not only is stripping unavailable, the required clothing is the heaviest in the sport.

That ordering — from "you may remove everything" to "you must wear a gi and a belt" — is the real spread between sports, and it is a spread of a few kilograms at the extreme, not of a fixed two-pound grace anyone grants.

An app can carry the arithmetic of a descent plan, and Fighter Cut will project a trajectory from today's weight to a weigh-in date; what it cannot do is tell you what your federation's officials will accept on the day. That is what the rulebook is for, and the rulebook is free in ten of the eleven cases here — the NFHS wrestling rules book is the one you have to buy.

Where these rules stop applying

Every statement in this article is scoped to a named document and a named date, and the scope is narrower than it looks.

Commission rules do not travel. Nevada's regulation applies in Nevada. California's applies in California. Every other state, tribal and provincial commission has its own administrative code, and the Unified Rules will not settle the question for you because they do not address it. If you are competing somewhere we have not named, the answer is in that commission's code and nowhere else.

National federation rules do not travel either. UWW's Article 11 governs UWW competition. A national federation's domestic events may differ, and a folkstyle or scholastic event in the United States is governed by the NCAA or NFHS regime, not by UWW's. The three wrestling regimes in this article genuinely disagree about attire, and they are meant to.

Minors are regulated differently everywhere. USA Boxing bars under-18s from weighing in naked, the IJF bars cadets from removing underclothing and adds 200 g, World Taekwondo adds 100 g for cadets and juniors, and the NFHS growth allowance exists solely because its athletes are still growing. An adult's rule is not a junior's rule in any of these sports, and reading across is a way to be wrong.

Women's rules are not always the same document. The NCAA women's wrestling rulebook is published separately by the NCWWC and we did not read it. Nevada's regulation names a top for female combatants, USA Boxing names the female sport hijab, and World Taekwondo and the IJF name a bra. The details differ; assume nothing transfers.

Editions change. A rule adopted is not a rule in force, and a rule in force this season may be amended for the next. We have given the version and the read date for every document precisely so that you can check whether it has moved.

What we could not verify

The NFHS Wrestling Rules Book is a paid publication and we did not read it. Every NFHS statement in this article comes from the federation's own free announcements — the 28 April 2020 release describing the rewrite of rule 4-5-7, and the 16 April 2026 release on the 2026-27 changes — rather than from the rule text in force. We cannot quote the current 4-5-7 verbatim, and we cannot confirm as an absence that nothing among the eighteen approved 2026-27 changes touches weigh-in attire, because NFHS's own release names only a handful of them and says the complete listing lives elsewhere. What we can say is that nothing NFHS has published announces such a change, and that one published change does affect weigh-ins by allowing teams to weigh in by team where that is more practical.

The NFHS attire wording and the growth-allowance dates come from state associations. The "legal uniform and a suitable undergarment" phrasing, the compression-undergarment requirement for female contestants, and the individual dates (1 January in California and Utah, 25 December in New York and Ohio) were read in state handbooks reproducing the NFHS rules, not in an NFHS primary document we could fetch.

California's § 297 was read on Cornell's Legal Information Institute, because the State of California's own CCR portal refuses automated retrieval. The text carries its full OAL history note through the Certificate of Compliance filed 12 July 2017, Register 2017 No. 28, and LII states that its California regulations are updated quarterly without giving a snapshot date for the displayed version. Re-verify at the state portal before relying on it for a licence matter. The neighbouring sections of the same Article 6 — § 298 Weights and Classes, § 299 Dehydration and Rehydration, § 305 Contestants' Appearance, § 306 Boxers' Equipment — we identified by title only and did not read.

The USA Boxing rulebook we read was a Local Boxing Committee mirror of the version effective 1 January 2025, and usaboxing.org separately publishes a revisions list dated 1 January 2026 that we did not obtain. The Rule 11 text above is what we verified; whether a 2026 revision touches it, we do not know.

We did not read the NCAA women's wrestling rulebook, and nothing in the NCAA section should be read as applying to it.

We found no authoritative mass for a wrestling singlet or for MMA fight shorts, and we did not print one. The gi figures in this article are vendor marketing copy, attributed as such.

We did not fetch a World Karate Federation competition rules document, so karate is omitted rather than guessed.

We could not confirm that any professional boxing sanctioning body sets weigh-in attire. No WBC, WBA, IBF or WBO rulebook clause on the subject was read, and we are not asserting that one exists.

The IBJJF version label is contested by its own publisher. The PDF's running footer reads "VERSION 6.1 2024" and its cover reads "JUN.2024", while the download page on ibjjf.com labels the same file v6.0. We cite the document.

Sources

Sourced to

1. Unified Rules of Mixed Martial Arts — Association of Boxing Commissions and Combative Sports, 9-page rules document, last amended 6 August 2025 with non-substantial changes; full-text searched 2026-09-23
2. Nevada Administrative Code Chapter 467 — Unarmed Combat — Nevada Legislature, official publication of the NAC; NAC 467.514 and 467.7956 last amended R032-18, 30 January 2019; NAC 467.522 last amended R062-16, 9 September 2016; NAC 467.476 last amended R090-07, 4 December 2007; read 2026-09-23
3. California Code of Regulations, Title 4, § 297 — Weighing Time — California State Athletic Commission, via Cornell Legal Information Institute; authority Business and Professions Code § 18611; amendments effective 12 July 2017, Register 2017 No. 28; read 2026-09-23. Its application to mixed martial arts runs through [§ 501](https://www.law.cornell.edu/regulations/california/4-CCR-501) and [§ 502](https://www.law.cornell.edu/regulations/california/4-CCR-502) of Chapter 2 (Full Contact Martial Arts and Kickboxing), also read 2026-09-23
4. International Wrestling Rules — Greco-Roman, Freestyle, Women's Wrestling — United World Wrestling, Article 11 Weigh-In; document footer "January 2026"; read 2026-09-23
5. 2025-26 and 2026-27 NCAA Men's Wrestling Rules — NCAA Men's Wrestling Rules Committee, ISSN 0736-511x, printed August 2025, Rule 9 Weigh-Ins; read 2026-09-23
6. 2025-26 and 2026-27 Men's Wrestling Rules Changes — NCAA, PROP-approved change list including the Rule 9.3.2 expansion, effective with the 2025-26 season; read 2026-09-23
7. 2020-21 High School Wrestling Rules Changes Address Weigh-In Procedures, Hair-Length Restrictions — National Federation of State High School Associations, news release on the rewrite of rule 4-5-7, 28 April 2020; read 2026-09-23
8. Adjustment in Minimum Body Fat Percentage for Females Highlights High School Wrestling Rules Changes — National Federation of State High School Associations, announcement of 2026-27 rules changes, 16 April 2026; read 2026-09-23
9. 2026-27 NFHS Wrestling Rules Book — National Federation of State High School Associations, paid publication; product listing cited to evidence that the rule text is not freely readable; checked 2026-09-23
10. IJF Sport and Organisation Rules — International Judo Federation, §§ 6.1–6.5, version 14 August 2026; read 2026-09-23
11. IBJJF Rules Book — General Competition Guidelines — International Brazilian Jiu-Jitsu Federation, file 2024JUN_IBJJF_Rules_EN.pdf, cover date June 2024, running footer "VERSION 6.1 2024", §§ 1.3, 1.4, 2.3, 8.1, 8.2, 8.3; read 2026-09-23
12. World Boxing Competition Rules — World Boxing, § 5.6 Weigh-ins, 50 pages, in force November 2024; read 2026-09-23
13. USA Boxing National Rule Book — USA Boxing, Rule 11.1 Scale, 72 pages, effective 1 January 2025; copy read is a Local Boxing Committee mirror and a 1 January 2026 revisions list exists separately; read 2026-09-23
14. WT Competition Rules & Interpretation — World Taekwondo, Article 9 Weigh-in, 81 pages, in force as of 1 June 2026; read 2026-09-23
15. FUJI Lightweight BJJ Gi — FUJI Sports product page, vendor-published weight for a 450 GSM size-A2 gi; a marketing figure, not an independent measurement. Cited by title only: the page was read on 2026-09-23 and is no longer published at that address, so no link is given.
16. Gold BJJ Aeroweave Ultralight Gi — Gold BJJ product page, vendor-published weight for an ultralight size-A2 gi; marketing figure, not an independent measurement; read 2026-09-23

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