The Unified Rules of MMA Explained: Fouls, Illegal Strikes and the Referee

Image: Piotr Drabik, CC BY 2.0

The Unified Rules of Mixed Martial Arts are the standard rulebook for professional MMA in the United States, and the UFC says all of its bouts are governed by them. The text belongs to the Association of Boxing Commissions and Combative Sports (ABC), which represents the state and tribal athletic commissions. Its own header records the rules as approved in April 2001 and amended repeatedly since, with the newest round of changes dated 5 August 2026 and a requested implementation date of November 2027. You can read the ABC text and the UFC rules page yourself.

The ABC publishes the rules, but each commission decides when and in what form to adopt them. The ABC text says any version that departs from it should carry the name of the sanctioning commission rather than being called the Unified Rules. That is why amendments arrive with a "requested implementation date" instead of taking effect overnight, and why a small regional show can run a slightly different rulebook to the one used in Las Vegas.

This guide follows the ABC's current published text. Where a detail comes from a different commission's version, it says so.

A professional round lasts five minutes, with one minute's rest between rounds. No contest can exceed five rounds or 25 minutes, and no fighter may compete more than five rounds or 25 minutes in any 24 hours. Bouts are generally scheduled for three or five rounds, and Calgary's published version notes that five-round fights are typically reserved for championship bouts and main events.

Every fighter must wear a mouthpiece, and a round cannot begin without one. If it falls out, the referee calls time at the first opportune moment without interrupting live action, and can deduct points if he or she believes it was spat out on purpose.

Plenty of things that look dirty are perfectly legal, and the rulebook spells most of them out. The short version:

• Strikes that hit the eye socket. A legal punch that lands on the eye socket is not eye gouging. Gouging means using fingers, chin or elbow on the eye.
• A strike that lands on the throat. If a punch thrown in stand-up catches the throat, it counts as clean. The foul is a directed attack, such as dragging an opponent's head round to open the neck, or digging fingers into the trachea.
• Foot stops and axe kicks. Stamping on the foot of a standing fighter is not a foul, and an axe kick is not a stomp. The stomping foul applies to a grounded opponent.
• Slams. Any throw with an arc to it is legal, even if the opponent's head touches the canvas. A fighter caught in a submission who lifts his or her opponent may also bring them down in any fashion, because they are not in control of the opponent's body.
• Fingers and toes. These are the small joints. Grabbing the majority of the fingers or toes at once is allowed. Wrists, ankles, knees, shoulders and elbows are large joints.
• Grabbing a hand. You may grip the opponent's actual hand, just not control it by the material of the glove.
• Kicks to the knee of a standing opponent. Nothing in the foul list bans them, although a proposal to change that is being debated (more on that below).

Headbutts, eye gouges and biting are the fouls most fans recognise. Butting with the head is illegal in any form, whether head to head or head to body. Eye gouging with fingers, chin or elbow is illegal, and so is fish hooking: hooking fingers into an opponent's mouth, nose or ears and stretching the skin.

Biting is illegal in any form, and the rules put a duty on the fighter: because a referee cannot always see a bite, the fighter who is being bitten must make the referee aware. Spitting at an opponent is a foul too.

Also in this group is fingers outstretched toward an opponent's face or eyes. In stand-up, a fighter who reaches forward with an open hand and fingers pointing at the face commits a foul. Fighters are told to close their fists or point their fingers straight up when reaching toward an opponent, and referees are told to communicate that clearly.

Strikes to the spine or the back of the head are fouls, and the rulebook defines the target zone precisely. The back of the head starts at the crown with a one inch variance to either side and runs down to the occipital junction. The zone then widens to cover the full width of the neck and travels down the spine, again with a one inch variance either side of the centreline, including the tailbone.

Throat strikes of any kind and grabbing the trachea are fouls, with the stand-up exception covered above. Spiking, or pile-driving, is illegal: a throw where you control an opponent with their feet in the air and head straight down, then drive the head into the canvas.

Groin attacks of any kind are fouls. That covers striking, grabbing, pinching and twisting, and the rules state plainly that the rule applies the same way to men and women.

A fighter is grounded when any part of the body other than the hands or feet touches the canvas, and a grounded fighter cannot be kneed or kicked to the head. Stomping a grounded fighter is also a foul. Punches and elbows to a grounded opponent, the heart of ground and pound, remain legal.

That definition is newer than many fans realise. The ABC approved it on 23 July 2024, and it replaced a version that treated a flat palm on the canvas as enough to make a fighter grounded. CBS Sports reported the commission's reasoning: the palm-down requirement encouraged fighters to touch a hand down to draw a foul. The new wording debuted at UFC Fight Night 246 in Edmonton on 2 November 2024, according to Yahoo Sports.

A worked example. A fighter crouches with both hands and both feet on the canvas, as though about to shoot. Under the old rule a palm down could have made him grounded and protected his head. Under the current rule he is not grounded, so a knee to the head is legal. If a knee touches the canvas, or a shin, hip or elbow, he is grounded and the knee to the head becomes a foul.

The same 2024 package removed the ban on the downward-pointing elbow, the "12 to 6" elbow. ESPN reported that Jon Jones's only loss on his record as of that vote, a 2009 disqualification against Matt Hamill, came under the old ban. The ABC's current foul list no longer includes that elbow, although the UFC's own rules page still listed it when this guide was written, so treat that page as out of date on this point.

Holding the fence or ropes is a foul when fingers or toes go through the cage and grab hold to control either fighter's position. Putting a hand on the fence to push off, or toes through the mesh, is fine. If the referee takes a point for fence-holding and the fighter ended up in a better position because of it, the referee should restart both fighters standing in a neutral position. A one point deduction is available when the foul had a substantial effect.

Holding an opponent's gloves or shorts to control movement is illegal, although holding your own is not. Hair pulling is illegal, and a fighter with long hair may not use it to hold or choke. Small joint manipulation, clawing, pinching or twisting the flesh, and putting a finger into any orifice or into a cut are all fouls. Throwing an opponent out of the ring or cage is a foul as well.

The remaining fouls punish behaviour around the fight. Timidity covers a fighter who avoids contact or runs from the action, and it can also be called for stalling tactics: falsely claiming a foul or injury, or purposely dropping or spitting out the mouthpiece. Abusive language is a foul, but the rules say fighters can talk during a match; it is the referee's sole call when language turns racist or derogatory.

Three fouls protect an opponent when the action stops. Attacking after the bell means any offensive action after the referee has called time. Attacking on a break means engaging during a time-out. Attacking an opponent under the care of the referee means hitting someone the referee has stopped to protect. The remainder are interference from a corner, flagrant disregard of the referee's instructions and unsportsmanlike conduct that causes an injury.

The referee follows a fixed order when a foul happens. He or she calls time, checks the fouled fighter's condition and safety, decides whether the fighter can continue and how much recovery time is justified, then assesses the foul for point deductions or other consequences. No coaching is permitted during any of these time-outs.

Two limits keep the process honest. A referee may never call a time-out to judge the impact of a legal strike, except when a laceration is present. And where a foul causes a cut, the referee may let the cutperson enter the cage during the break to treat it, with the fighter back in action inside the five minute limit once the ringside physician clears them. The cutperson may only work on cuts linked to the foul.

A fighter hit by a groin foul or an eye poke who can continue may have up to five minutes to recover. A fighter hurt badly enough to need medical advice can be given up to five minutes, at the referee's discretion, for the ringside physician to evaluate before a decision to continue is made.

The eye poke procedure has its own steps. Once time is called, the fighter may use a cold compress or wet towel on the eye. Unless immediate medical attention is needed, the referee and physician give the fighter time to compose themselves, and the fighter then answers "yes" or "no" to whether they can see. The physician can examine the injury at any point in the time-out. An accidental poke is still a foul; what the referee decides is whether it was intentional, which changes the penalty.

A foul can cost points, but how many depends on intent. If an intentional foul causes an injury and the fight continues, the referee must deduct two points and notify the authorities; that deduction is mandatory. An unintentional foul can earn a warning or a deduction, at the referee's discretion. Only the referee can assess a foul, and the UFC rules page says the official scorekeeper applies the deduction to the card.

The arithmetic matters. If a fighter wins a round 10-9 and then loses two points for an intentional foul, that judge's card reads 8-9 for the round, so the fouler loses it. Incomplete rounds are scored too, with any penalties applied when the scorekeeper totals the partial round. A round where no action took place is generally scored even, at the judges' discretion.

When a foul ends the fight, the result depends on whether it was accidental and how far the bout had gone. The rules set the threshold at two completed rounds of a three-round fight, or three completed rounds of a five-round fight.

• Accidental foul, stopped before the threshold: a no contest or a disqualification.
• Accidental foul, stopped after the threshold: a technical decision to the fighter ahead on the scorecards.
• Intentional foul that ends the fight at once: the fouling fighter loses by disqualification.
• Intentional foul, fight continues, later stopped after the threshold: a technical decision if the injured fighter is ahead, a technical draw if he or she is behind or even.

In a three-round fight, then, an accidental eye poke that ends the contest in round two gives a no contest, but the same poke in round three sends the fight to the scorecards. A fighter who injures himself while trying to foul gets no help from the referee; it is treated as if a fair blow caused it. Disqualification can also follow multiple fouls or flagrant disregard for the referee's commands.

The referee is the sole arbiter of the bout and the only person authorised to stop it. A referee's authority begins when the inspectors leave the cage and ends when they return after the fight. Video review is only available under the local commission's procedure after a protest alleging a clear rule violation, and instant replay can only be used to review a fight-ending sequence after the fight has been stopped; once it has been used, the fight cannot restart.

Referees also police stalling. The rules tell the referee to stand fighters up or break them when neither shows real, significant or sustained effort to finish the fight, and add that simply holding a superior position does not count as effort or earn a guaranteed chance to keep it.

Judges do the scoring, and there must be at least three of them under the ABC text. Calgary's version adds that they assess the action from different locations and that the referee cannot also be a judge. Judges do not call fouls. Only the referee can do that, and in Calgary's version the referee then notifies the fighter, the commission, the seconds, the judges and the scorekeeper of the decision and any deduction.

The other officials round out the team. The timekeeper assists the referee with the start and end of each round and rest period. The ringside physician can examine a fighter during a time-out and is the other person, besides the referee, allowed to stop a contest in Calgary's version. A scorekeeper totals the cards, and the commission rather than the promotion hears protests about the assignment of a judge or referee.

The submission and stoppage rules give officials their cues. A tap, a verbal tap, or a technical submission, where a legal hold causes unconsciousness or a broken or dislocated bone or joint, ends a bout by submission. A referee stops a bout by TKO when a fighter is not intelligently defending, and by KO when a fighter cannot.

The rulebook is not static. California State Athletic Commission executive director Andy Foster has proposed making lateral kicks to the knee a foul, and MMA Sucka reported that the idea followed a fight where a fighter said he did not realise such kicks were legal. As of this week nothing has been changed: the ABC would need to amend the rules and commissions would have to adopt them.

The history shows how slowly this happens. The ABC committee report from 30 July 2009 argued that 12 to 6 elbows should stay banned, and the ban survived until 2024. If you want to know what is actually in force on a given card, the answer is the version adopted by the commission running the show.

• Association of Boxing Commissions and Combative Sports: Unified Rules of Mixed Martial Arts (August 2026 edition)
• UFC: Unified Rules of Mixed Martial Arts
• ESPN: ABC votes to remove 12-6 elbow ban, redefines grounded opponent
• CBS Sports: Commission removes 12-6 elbows from Unified MMA rules, updates grounded opponent rule
• Yahoo Sports: Unified rules changes to debut at UFC Edmonton
• Calgary Combative Sports Commission: Mixed Martial Arts Unified Rules (June 2018)
• MMA Sucka: Shahbazyan confusion puts MMA rules under fresh scrutiny
• Association of Boxing Commissions: Committee Report on Unified Rules for MMA (2009)

Is an eye poke a foul in MMA?

Yes. An eye poke is a foul even when accidental. The referee calls time, lets the fighter use a cold compress, and gives them up to five minutes to recover and answer yes or no to whether they can see. If they cannot continue, the result depends on how many rounds were completed.

How long does a fighter get to recover from a low blow?

Up to five minutes. A fighter hit by a groin foul who is able to continue may take up to that time, and a fighter hurt badly enough to need the ringside physician can also be given up to five minutes at the referee's discretion. The referee cannot call time to assess the impact of a legal strike.

What happens if an accidental foul ends a fight?

If it is stopped before two rounds of a three-round fight, or three rounds of a five-round fight, are complete, the result is a no contest or disqualification. After that point, the fighter ahead on the scorecards wins by technical decision. Partial rounds are scored.

Are 12 to 6 elbows legal in the UFC now?

Yes. The ABC voted on 23 July 2024 to remove the ban on downward-pointing elbows, and the change debuted at UFC Fight Night 246 in Edmonton on 2 November 2024. The ABC's current foul list no longer includes the strike, though local commissions decide when to adopt changes.

Can you knee a downed opponent in the head in MMA?

Only if the opponent is not grounded. A fighter is grounded when any part of the body other than the hands or feet touches the canvas, and kneeing or kicking the head of a grounded fighter is a foul. A fighter with only hands and feet down can legally be kneed.

Who can stop an MMA fight?

The referee is the only official authorised to stop a bout, though a ringside physician can also stop a contest in some rulebooks, such as Calgary's. Judges cannot stop a fight or call fouls. A corner can also end a fight on behalf of its fighter, scored as a TKO by corner stoppage.