Key takeaways
- Separate a KO from a TKO by asking how it ended: a completed ten count in boxing, or strikes leaving an MMA fighter unable to defend, is a KO; most other stoppages are TKOs.
- Treat a doctor stoppage, a corner retirement and a failure to come out for the next round as technical knockouts, not knockouts.
- Check the rulebook before reading a foul-shortened result: the same early stoppage for an accidental foul is a no decision under the unified boxing rules and a technical draw under the WBC's championship rules.
- Count a choke that renders a fighter unconscious as a technical submission under the ABC's MMA rules, not as a knockout.
- Remember that a commission can still change a result afterwards in narrow cases, such as an anti-doping violation in Nevada.
A knockout (KO) means a fighter was finished outright: in boxing, still down when the referee reaches ten; in MMA, stopped because strikes left them unable to defend themselves. A technical knockout (TKO) covers most other stoppages: the referee stepping in to protect a fighter, a ringside physician stopping it, a corner retiring its fighter, or a fighter failing to come out for the next round. Nevada's boxing regulation draws the line most cleanly: a win that comes from neither a full count of ten nor the judges' scorecards is adjudged a technical knockout.
Everything else — submissions, technical decisions, technical draws, disqualifications, no contests — follows from a few questions about how the fight stopped. The definitions below come from the Association of Boxing Commissions' unified rules for boxing and for MMA (the MMA document in its current version, amended 5 August 2026; the result definitions used here read the same in the 2025 text), the ABC's boxing referee manual, Nevada's unarmed-combat regulations, and the WBC's and WBA's own rulebooks.
Four questions that identify any ending
- Did it go to the scorecards? If the scheduled rounds were completed, the result is a decision or a draw. If a foul-related injury ended it after a minimum number of rounds, it is a technical decision or draw.
- Was it stopped because of legal blows? Then it is a KO or a TKO, and the next section separates the two.
- Did someone give up? In MMA a tap or a verbal submission ends it. In both sports, a fighter who does not come out for the next round, or whose corner retires them, has lost by TKO.
- Did a foul end it? An intentional foul that ends the bout is a disqualification. An accidental one produces a no decision, a no contest or a technical draw if it comes early, depending on the rulebook, and a technical decision later.
Most arguments about a result are really arguments about which of those four questions applies.
Knockout: counted out, or unable to defend
In boxing a knockout is a count. When a downed boxer is still down at ten, the referee waves both arms and the fight is over. Nevada's regulation tells the referee to perform the full ten-second count unless doing so would jeopardise the boxer's safety.
MMA has no count at all — Nevada's counting provisions expressly do not apply to it — which suits a sport in which a fighter on the canvas can still defend, grapple or be submitted. The ABC's MMA rules define a knockout as the referee stopping the contest because the fighter cannot intelligently defend themselves, due to strikes. Nevada's MMA regulation describes the same result as a fighter rendered unconscious by a strike, kick or other legal manoeuvre.
Technical knockout: who is allowed to stop it
The ABC's MMA definition of a TKO turns on one distinction from its definition of a knockout: the fighter is not intelligently defending themselves, rather than cannot. The rules then list who and what can produce one:
| Route to a TKO | MMA (ABC Unified Rules, 8.2026) | Boxing |
|---|---|---|
| Referee, because of strikes | Yes | Yes: the referee may stop a one-sided bout or one where continuing risks serious injury (Nevada) |
| Cut or other injury from a legal blow | Yes, as a referee or medical stoppage | Yes: the injured boxer loses by TKO (ABC rule 11) |
| Ringside physician | Yes, "doctor stoppage" | In most jurisdictions, per the ABC referee manual |
| Corner | Yes, "corner stoppage" | Yes, through the referee; in US professional boxing the chief second tells the commission inspector rather than throwing a towel |
| Did not come out for the next round | Yes, "did not answer the bell" | Yes: Nevada awards a TKO as of the last completed round |
| Loss of bodily function | Yes, as a medical stoppage | — |
A few TKOs come from less obvious places. The ABC's referee manual says a boxer who loses their mouthpiece and has no spare loses by TKO. A boxer hit by an accidental low blow who cannot continue after up to five minutes' recovery loses by TKO, as does a boxer who injures themselves through their own illegal or unorthodox move and cannot resume.
Because so many different stoppages share one label, the usual convention is to count knockouts and technical knockouts together in a record's bracketed figure — our guide to boxing records explains how to read it.
Submission, the ending boxing does not have
The ABC's MMA rules recognise three kinds of submission:
- Tap out: the fighter physically signals that they do not wish to continue.
- Verbal tap out: the fighter says so, or screams in pain or distress to the referee.
- Technical submission: a legal submission hold results in unconsciousness or a broken or dislocated bone or joint.
That third category settles a common argument, at least under the ABC text. A choke that renders a fighter unconscious is a technical submission, not a knockout, because the knockout category in those rules is reserved for strikes. Commissions word it differently, though: Nevada's regulation lists only physical and verbal tap-outs as submissions, and defines a knockout as unconsciousness caused by "a strike, kick or other legal maneuver". How grapplers create these finishes in the first place is covered in striking versus grappling in MMA.
Decisions and draws
If the scheduled rounds are completed, three judges' cards decide it. Under the MMA rules a decision is unanimous when all three judges favour the same fighter, split when two favour one fighter and one the other, and majority when two favour one fighter and the third scores a draw. Draws come in unanimous, majority and split forms too. How each card is built round by round is explained in how boxing scoring works, and the MMA criteria in how MMA judging works.
When a foul cuts the fight short
This is where rulebooks diverge most, in both thresholds and vocabulary. For an accidental foul that leaves a fighter unable to continue:
| Rulebook | Stopped early | Stopped after the threshold |
|---|---|---|
| ABC Unified Rules of Boxing | No decision, if before four completed rounds | Technical decision to the boxer ahead on the cards |
| Nevada, boxing | No decision, if in the first three rounds of a bout of six rounds or fewer, or the first four of a longer bout | Decided by scoring the completed rounds and the round of the stoppage |
| WBC championship rules | Technical draw, if before the bell for round five | Technical decision |
| WBA rules | Technical draw, if before the fourth round is completed | Technical decision; a draw if the cards are level |
| ABC Unified Rules of MMA | "No contest or disqualification", if before two of three or three of five scheduled rounds are completed | Technical decision to the fighter ahead |
Intentional fouls are simpler. If one causes an injury that ends the fight on the spot, the fouler is disqualified under every rulebook above. If the injured fighter carries on and the same injury forces a stoppage later — after the fourth round in boxing, or after two of three or three of five rounds in MMA — the unified rules for both sports send it to the cards: a technical decision if the injured fighter is ahead, a technical draw if they are behind or level. In MMA, multiple fouls or flagrant disregard of the referee can also lead to disqualification.
One clash of heads, three labels
Worked example. Assume a ten-round boxing match. In round three an accidental clash of heads opens a cut, and the ringside physician advises that it cannot continue.
- Under the ABC's unified rules, fewer than four rounds are complete, so the result is a no decision.
- Under Nevada's code, the foul came within the first four rounds of a bout scheduled for more than six, so it is also a no decision.
- Under the WBC's championship rules, the stoppage came before the bell for round five, so it is a technical draw.
Nobody won and nobody lost under any of the three, but the record will read differently. Move the same clash to round seven and all three converge: the judges' cards decide it, with the partial seventh round scored.
Can a result be changed afterwards?
Rarely. Nevada's commission will not change a decision unless there was collusion, the compilation of the judges' scorecards shows the decision went to the wrong fighter, or the referee misinterpreted the regulations. Separately, if a fighter who won or drew is found to have committed an anti-doping violation, the commission may change the result to a no contest and note the reason in their record.
Results in a drafted stable
40-0 MMA & Boxing Fight Draft describes its results in simpler terms than a rulebook does. Its MMA simulator resolves bouts by knockout, technical knockout, submission or decision; its boxing simulator adds draws and judges' scorecards. Those outcomes come from the game's own model of the fighters you draft, not from any real bout, and they are not forecasts of anything outside the game.
The combat sports hub collects the rest of our rules guides, and the sports GM blog covers the drafting and management side.
Good to know
Frequently asked questions
What is the difference between a KO and a TKO?
Is a doctor stoppage a TKO?
What is a technical decision?
What is the difference between a no contest and a no decision?
Is a choke that knocks someone out a knockout?
Sources
- Unified Rules of Mixed Martial Arts (amended 5 August 2026, version 8.2026) (opens in a new tab)Association of Boxing Commissions and Combative Sports — accessed
- Unified Rules of Boxing (opens in a new tab)Association of Boxing Commissions and Combative Sports — accessed
- ABC Boxing Referee Manual (rev. 08/2025) (opens in a new tab)Association of Boxing Commissions and Combative Sports — accessed
- NAC Chapter 467 — Unarmed Combat (opens in a new tab)Nevada Legislature — accessed
- WBC Rules for Championship Fights (synthesized version) (opens in a new tab)World Boxing Council — accessed
- Rules of the World Boxing Association (amended December 2022 and April 2024) (opens in a new tab)World Boxing Association — accessed
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