Guide
FIBA rules vs NBA rules: every difference that matters
FIBA rules vs NBA rules compared from both rulebooks: court and three-point lines, 40 minutes against 48, the possession arrow, fouls and goaltending.
By CricketTaken EditorialPublished Guide20 min read
Watch an Olympic quarter-final after a winter of NBA basketball and something feels off before you can name it. A centre parks himself under his own rim for the entire shot clock and nobody blows a whistle. A defender pins a ball that has just bounced up off the rim, and again nothing. A guard gets trapped in the corner with two seconds left, waves both arms for a time-out, and the referee ignores him.
None of that is sloppy officiating. All three are correct under FIBA rules, and all three would be violations in the NBA. The FIBA rules vs NBA rules comparison is usually reduced to a table of court measurements, which misses the point: the differences that change how the game is played are not the lines on the floor, they are the rules about who may stand where, who may touch the ball when, and who may stop the clock.
What follows is both rulebooks side by side, taken from the documents themselves, with the tactical consequence of each difference spelled out.
Two rulebooks written for two different jobs
The international rules are the Official Basketball Rules, approved by the FIBA Central Board at Mies in Switzerland in April 2024 and in force from that October. They govern every FIBA competition, from an Olympic final to a schools tournament, and they are written to be applied anywhere, by officials of any standard, on a court that may or may not have a replay system attached to it.
The NBA rulebook governs thirty clubs playing in thirty arenas with a centralised replay centre, a coach's challenge, and a television schedule that the rules themselves are written to accommodate. The current edition is the 2025-26 rulebook.
That difference of purpose explains most of what follows. FIBA writes rules that work without technology and without discretion. The NBA writes rules for a specific product, and it is willing to make them complicated when complication improves the game or the broadcast.
Neither is a subset of the other. There are places where the NBA is stricter, places where FIBA is stricter, and a surprising number of places where both are identical and everyone assumes they are not.
- 5Players on court per team
- 24Seconds on the shot clock
- 5Minutes in an overtime period
- 4Team fouls per period before the bonus
FIBA Articles 4, 8, 29 and 41 against NBA Rules 3, 5, 7 and 12.
The court is not the same size, and the three-point line is the reason it matters
FIBA fixes the court at 28 m long by 15 m wide, measured from the inner edge of the boundary line. The NBA court diagram in Rule 1 gives 94 feet by 50, which is 28.65 m by 15.24 m. Two thirds of a metre longer and a quarter of a metre wider. Nobody has ever noticed that difference while watching.
The three-point line is a different story.
FIBA's arc has a radius of 6.75 m, measured from the point on the floor directly beneath the exact centre of the basket to the outer edge of the arc, and it joins two straight lines running out to the endline whose outer edges sit 0.90 m in from the sidelines. The NBA arc is 23 feet 9 inches, which is 7.24 m, and its straight sections sit 3 feet from the sidelines, which is 0.91 m.
Now do the arithmetic the tables never do. The corner sections are effectively in the same place: 0.90 m against 0.91 m from the sideline. Because the two courts are almost the same width, a corner three is 6.60 m in FIBA and 6.71 m in the NBA. Eleven centimetres apart. The corner shot is, to all practical purposes, the same shot in both codes.
The top of the arc is not. There the gap is 49 cm, most of a stride, and it produces a consequence that shows up in every possession of an international game: the discount for shooting from the corner is four times larger in the NBA.
A FIBA player who steps into the corner saves 15 cm on his shot. An NBA player who does the same saves 53 cm. That is why the corner three became the organising principle of NBA offence and why it is a smaller prize internationally. The whole geometry that pulled American basketball apart, described in detail in our piece on what happened to shot selection once the arc arrived, is compressed in the FIBA game. The band of floor between the arc and the paint, the dead zone that NBA analytics spent a decade eliminating, is much narrower when the arc is 6.75 m out.
The lane is the surprise. FIBA marks its restricted area with lines whose outer edges sit 2.45 m from the mid-point of the endline, making the lane 4.90 m wide. The NBA lane is 16 feet, which is 4.88 m. Two centimetres apart. The trapezoid that made international basketball look strange to American eyes is long gone, and the paint is now the same box in both codes. What differs is who is allowed to stand in it, which we come to below.
One more measurement is worth flagging because it is routinely misquoted. The NBA sets its free-throw line 15 feet from the plane of the face of the backboard. FIBA sets its 5.80 m from the inner edge of the endline. Those are two different reference points, and putting "15 feet" and "5.80 m" next to each other in a table, as though one were a conversion of the other, is comparing measurements taken from different places. The shooter stands at effectively the same distance from the rim in both codes. The rulebooks simply describe how to paint the line differently.
The arc under the basket differs too, and by more than the numbers suggest. FIBA's no-charge semi-circle has a radius of 1.30 m from the point beneath the centre of the basket. The NBA's restricted area is a half-circle 4 feet from the centre of the ring, which is 1.22 m. A slightly larger protected zone in the international game, and slightly less room for a defender to take a charge under the rim.
Forty minutes against forty-eight, and what the missing eight minutes do
FIBA plays four quarters of ten minutes. The NBA plays four of twelve. Everything else about the clock is closer than you would expect: five-minute overtimes in both, a fifteen-minute half-time in both.
The gaps between quarters diverge. FIBA prescribes a flat two minutes between the first and second, between the third and fourth, and before each overtime. The NBA allows 2:30 for local broadcasts and 3:30 for national ones between the first and second and the third and fourth periods, with 2:30 before overtime on national games. The difference is television, stated openly in the rulebook.
Eight minutes is a sixth of an NBA game, and it is the reason almost every raw comparison between the two competitions is broken. A player averaging twenty a game in a FIBA competition is scoring at a materially higher rate than a player averaging twenty in the NBA, because he is doing it in forty minutes of team basketball rather than forty-eight. Anyone comparing scoring across the two has to work in rate statistics rather than totals, which is the whole argument for the per-possession framework that took over basketball analysis in the first place.
The shot clock is 24 seconds in both codes, and both reset to 14 rather than 24 when the attacking team recovers the ball after it has touched the ring. That symmetry is newer than most fans realise and it removed one of the older differences between the two games.
Both codes handle the very end of a period carefully and differently. FIBA states that when a foul is committed near the end of a quarter, the referee determines the remaining time and a minimum of 0.1 second must be shown on the clock. The NBA requires its game clock to display tenths of a second during the last minute of every period, and adds time back if a whistle sounds before the clock reaches zero.
The possession arrow, and the jump ball that almost never happens
This is the difference that changes the most possessions per game, and it is the one casual viewers notice last.
FIBA tosses the ball exactly once. The crew chief throws it up between two opponents in the centre circle to start the first quarter, and that is the only jump ball a FIBA game will normally contain. Everything afterwards runs on alternating possession, which the rules describe as a method of causing the ball to become live with a throw-in rather than a jump ball.
The arrow is set immediately. The team that does not gain first control of a live ball after the opening tip is entitled to the first alternating possession throw-in. From then on, every jump ball situation, meaning a held ball, a ball out of bounds when the officials disagree or are unsure, a live ball wedged between ring and backboard, and the start of every quarter after the first and every overtime, is resolved by handing the ball to whichever team the arrow favours and then flipping it.
There is a sting in the tail. If the team taking an alternating possession throw-in commits a violation on it, the arrow flips immediately and the opponents get the next one too. A foul by either team during that throw-in does not cost the arrow. The distinction between a violation and a foul, which most fans use interchangeably, is worth real possessions here.
The NBA does the opposite. It uses a jump ball at the start of the game and at the start of every overtime, and it keeps jump balls alive throughout: a held ball, a ball knocked out by both teams, a ball nobody can be sure about, and a handful of specific double-violation situations all go up in the air at the nearest circle. A held ball is contested by the two players who caused it. Everything else is contested by any two opponents.
The consequence on the floor is direct. In the NBA, a guard who wraps up a centre and forces a held ball has created a genuine mismatch and often a possession. In FIBA, the same play is worth a line in the scorebook. Tying up a bigger opponent is a skill the international game does not reward, and coaches teach it accordingly.
The NBA's arrangement of quarters has an oddity of its own. The team that wins the opening tip does not just get the first possession, it gets the first possession of the fourth quarter, while its opponents open the second and third from behind their opponents' endline. One toss at the start of the evening decides the ball at the start of the period that usually decides the game.
- The opening tipBoth codes put the ball up between two opponents in the centre circle. Under FIBA rules this is normally the only toss of the night.
- The arrow is set, FIBA onlyWhichever team fails to gain first control of the live ball is entitled to the first alternating possession throw-in, and the arrow points towards its opponents' basket.
- A held ball in the first quarterFIBA hands it to the team the arrow favours and reverses the arrow. The NBA sends the two tangled players to the nearest circle for a fresh toss.
- Start of the second quarterFIBA uses the arrow, thrown in from the centre line extended opposite the scorer's table. The NBA gives it to the side that lost the opening tip, from behind its opponents' endline.
- Start of the third quarterFIBA runs the arrow procedure again. The NBA again gives it to the side that lost the tip.
- Start of the fourth quarterFIBA runs the arrow procedure again. The NBA hands it to the team that won the opening tip, which is the moment the toss pays a second time.
- A violation on the arrow throw-in, FIBA onlyThe offending team loses the ball and the arrow reverses at once, so its opponents also hold the next alternating possession. A foul on the same throw-in does not cost the arrow.
- Overtime beginsFIBA starts it with an alternating possession throw-in. The NBA throws the ball up in the centre circle all over again.
FIBA Article 12 against NBA Rule 6. Both open with a toss; only one of them uses another.
FIBA rules vs NBA rules in the paint: one three-second rule or two
Both codes police attacking players in the lane, and the wording is close. FIBA forbids a player from remaining in the opponents' restricted area for more than three consecutive seconds while his team controls a live ball in the frontcourt and the clock is running, with allowances for a player leaving the area, a player in the act of shooting, and a player who dribbles in to score having been there for under three seconds. To be established outside, both feet must be on the floor outside the lane. The NBA rule is the same idea, applied to the lane plus an imaginary four-foot extension off the court behind the baseline, with the count starting only once the ball is controlled in the frontcourt.
Then the NBA adds a second three-second rule that FIBA does not have at all.
Under NBA Rule 10, any defensive player positioned in the sixteen-foot lane, or in the four feet of floor extending past the lane behind the baseline, must be actively guarding an opponent within three seconds. Actively guarding is defined precisely: within arm's length of an offensive player and in a guarding position. The count is suspended in five circumstances, including a player being in the act of shooting, a loss of team control, and the moment it becomes clear the defender will exit. A defender guarding the ball-handler may sit in the lane without meeting the arm's-length test, but the moment the ball is passed away he must pick somebody up or leave.
The penalty is unusual: a technical foul, one free throw, and the attacking team keeps possession on the sideline at the free-throw line extended, with the shot clock left alone or reset to 14, whichever is greater. Not a loss of ball, a free point.
FIBA has nothing equivalent. A FIBA centre may stand in the middle of his own paint for the entire twenty-four seconds, guarding nobody, waiting.
This one rule does more to separate the two games than every court measurement combined. It is why international defence tolerates a genuinely stationary rim protector and NBA defence does not, and why the coverages that dominate the NBA, particularly the drop scheme against the pick and roll, have to keep their big man technically legal while he does something a FIBA big man does for free. It is also why the zone looks different: a zone defence in an international game can genuinely wall off the rim, while an NBA zone has to keep rotating bodies through the lane to avoid the whistle.
Above the rim, the two codes stop agreeing entirely
The largest single divergence in the two rulebooks is what a player may do to a live ball near the basket.
The NBA position, in Rule 11, is expansive. A player may not touch a ball on its downward flight with an opportunity to score. He may not touch any ball above the ring and within the imaginary cylinder. He may not touch a ball after it has struck the backboard above ring level, on the way up or the way down. He may not touch the ball or the ring while the ball is sitting or rolling on the ring. The imaginary cylinder rising from the ring is a protected volume, and the rule keeps the ball protected right through until it has finished its business with the basket.
FIBA draws the line somewhere else entirely. Its Article 31 states that the goaltending restrictions apply until the ball either no longer has a possibility of entering the basket or has touched the ring. Once the ball touches the ring in a FIBA game, the restrictions are over. Any player may pin it, tip it, swat it or catch it, including directly above the basket, provided he does not touch the ring, net or backboard while the ball is in contact with the ring, and does not reach through the basket from below.
FIBA has no cylinder. The word appears in its rulebook only in the context of the space a player occupies when contact is judged, not as a protected column above the rim.
That difference produces the play American viewers find hardest to accept: a ball bounces up off the rim, a defender rises and pins it against the underside of nothing at all, and the game continues. Legal internationally, two points in the NBA. The full decision sequence, and the separate question of what counts as basket interference rather than goaltending, is worked through in our piece on the goaltending rule and the line it draws, which is where the edge cases belong.
Fouls: five or six, and the overtime clause nobody mentions
A FIBA player is out of the game on his fifth foul. An NBA player gets six. That is the difference everyone knows, and it is more consequential than it sounds in a game that is eight minutes shorter: a FIBA star has one fewer foul to spend across a fifth less playing time.
The team foul thresholds match. Both codes put a side into the penalty after four team fouls in a period, and both then award two free throws for a common foul on a player who is not shooting. FIBA states it as a team foul penalty situation entered after four fouls in a quarter. The NBA phrases it as four team fouls per regulation period without additional penalty, with the fifth and every subsequent one drawing a free throw plus a penalty free throw.
Two clauses separate them, and both favour the defence in one code and not the other.
The NBA gives a disciplined team a free foul at the end of a period. If a team has not used its quota of four during the first ten minutes of a regulation period, it may commit one more in the last two minutes without penalty. Play a clean ten minutes and the rulebook hands you a foul to give exactly when a foul to give is most valuable.
FIBA does the opposite in overtime. Its rules state that all team fouls committed in each overtime are considered as being committed in the fourth quarter, and that fouls committed during an interval of play count in the following quarter. A FIBA team that finishes regulation in the penalty starts overtime in the penalty and stays there. The NBA resets: three common fouls are allowed in an overtime period before the bonus applies, and two free throws follow from the fourth.
That is a genuinely large difference in how the last five minutes of a tied game are played. An NBA team gets a fresh set of fouls to spend. A FIBA team that has already spent them is giving away free throws from the tip of the extra period.
Both codes treat the ugly end of the foul spectrum separately, and the vocabulary differs enough to confuse people. FIBA has the unsportsmanlike foul and the disqualifying foul; the NBA has the flagrant foul in two penalties, plus punching fouls and away-from-the-play fouls with their own administration. The tests are not identical and the NBA's flagrant foul criteria deserve their own treatment, but the structural point holds in both: contact that is not a legitimate attempt to play the ball is punished with free throws and possession rather than with possession alone.
Time-outs, and the one that a trapped player cannot call
FIBA allows two time-outs in the first half and three in the second, of which no more than two may be taken once the clock shows 2:00 or less in the fourth quarter, plus one in each overtime. Unused ones do not carry over. Each lasts one minute.
The NBA allows seven charged time-outs in regulation, no more than four of them in the fourth quarter, and no more than two after the later of the three-minute mark of the fourth quarter or the second mandatory time-out of that quarter. Two more are available in each overtime. On top of the team's own, there are two mandatory time-outs in every period, taken by the official scorer at the first dead ball after 6:59 and after 2:59 if the teams have not called their own, and charged to a team in turn. Mandatory time-outs run 2:45 on local broadcasts and 3:15 on national ones; any further team time-out in a period lasts 1:15.
Count the interruptions rather than the allowance and the gap widens further. A EuroLeague game, which is played under FIBA rules with the competition's own modifications, treats the first time-out a team takes in a quarter as the television break, and grants an uncharged one at the first dead ball inside the last five minutes if neither side has called one. That mechanism, and the rest of the EuroLeague's competition structure, exists to give broadcasters a predictable break without adding stoppages the coaches did not want.
The rule that actually decides games is about who may ask, and when.
Under FIBA, only the head coach or first assistant coach may request a time-out, and it may only be granted during a time-out opportunity, which begins when the ball is dead and the clock is stopped. A player with the ball in his hands, trapped on the sideline, has no time-out to call. He has to make a pass.
Under the NBA rule, a request from a player in the game or from the head coach is granted when the ball is dead or when the requesting team is in control of the ball. A ball-handler who is about to lose it can simply call time-out and the play is over.
Every NBA fan has seen a player saved by that rule and few realise it does not exist internationally. It changes what full-court pressure is worth. Trapping the ball-handler in the corner with four seconds left is a high-value tactic under FIBA rules and a much lower-value one in the NBA, where the reward for a perfect trap is often a whistle.
Five seconds means two different things
Both rulebooks contain a five-second violation and they are not the same violation.
FIBA's applies to a closely guarded player: a player holding a live ball on the court with an opponent in an active legal guarding position no more than a metre away must pass, shoot or dribble within five seconds. Standing still with the ball while a defender pressures you is a turnover.
The NBA has no such rule for a player holding the ball. What it has instead is a five-second back-to-the-basket violation: an attacking player in his frontcourt below the free-throw line extended may not dribble with his back or side to the basket for more than five seconds. It is a rule aimed squarely at the slow post-up, written to speed up a specific kind of offence rather than to reward ball pressure.
Both codes give eight seconds to advance the ball from backcourt to frontcourt, and both give five seconds to release a throw-in. The difference is what happens once the ball has arrived. A FIBA defender who gets and holds a metre of pressure on a stationary ball-handler is running a clock. An NBA defender in the same position is not.
Travelling, in one paragraph
Both codes now define the gather, the moment a player takes control of the ball, and both allow two steps after it. The wording differs and the enforcement differs more, particularly on the step a player is permitted before starting his dribble. The travelling rule deserves more room than a comparison piece can give it, and the step count, the gather and where the two codes actually part company is treated properly on its own page.
What to watch for in the next international game you see
Four things will tell you which rulebook is in force within about ninety seconds of tip-off, and none of them requires looking at the floor markings.
Watch the defensive centre when the ball goes to the opposite wing. If he stays in the paint and nobody counts him down, you are watching FIBA basketball. If he drifts out and back in a rhythm that has nothing to do with the ball, he is managing an NBA count.
Watch what happens after the first held ball. A toss at the nearest circle is the NBA. A referee pointing at the scorer's table while a small plastic arrow flips is FIBA, and it means nobody will jump for the ball again all night.
Watch a long rebound off the front of the rim. If a defender goes up and swats it after the bounce, that is legal international basketball. In the NBA it is two points for the shooter.
Watch the last possession of a close quarter. If the ball-handler is trapped and looks for the referee, he is playing in the NBA. Internationally he has to solve it himself, which is why the last four seconds of a FIBA game so often end in a pass nobody wanted to make.
Both sets of rules are published in full by their governing bodies, and both are short enough to read in an evening. If you follow international competition beyond the club season, the same FIBA rulebook governs the qualification pathway to the Olympics and the World Cup, and the rest of our basketball explainers work through the individual rules in more depth than a side-by-side comparison allows.
Common questions
How long is a FIBA basketball game compared to an NBA game?
A FIBA game is four quarters of ten minutes, so forty minutes of regulation. An NBA game is four quarters of twelve minutes, so forty-eight. Overtime is five minutes in both codes, and half-time is fifteen minutes in both.
How far is the FIBA three-point line?
The arc is 6.75 m measured from the point on the floor directly beneath the centre of the basket, and the two straight sections in the corners sit 0.90 m in from the sidelines. On a 15 m wide court that puts the corner shot at 6.60 m, only fifteen centimetres shorter than the top of the arc.
Does FIBA have a defensive three-second rule?
No. FIBA's three-second rule applies only to an attacking player standing in the opponents' restricted area while his team controls the ball in the frontcourt. A FIBA defender may stand in the paint indefinitely, which is the single biggest reason international defences look different from NBA ones.
Why does FIBA use a possession arrow instead of a jump ball?
FIBA tosses the ball once, at the start of the first quarter, and then resolves every held ball and every subsequent quarter by alternating possession. The arrow is a deliberate simplification: it removes an unequal contest between whichever two players happen to be tangled up, and it removes the delay of setting up a fresh toss.
How many fouls do you get in FIBA basketball?
Five. A player who commits a fifth foul must leave the game immediately, against six in the NBA. Both codes put a team into the bonus after four team fouls in a period, but FIBA counts overtime fouls as fourth-quarter fouls, so a team in the penalty at the end of regulation stays in it.
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