Basketball Rules Explained: The Complete Guide for Fans & Beginners

The objective of basketball is straightforward: score more points than your opponent by shooting the ball through a 10-foot-high hoop — the basket — before time expires. Each team fields five players on the court simultaneously, and the game is split into timed periods (quarters or halves depending on the league).

Points are awarded based on where on the court the shot is taken: 1 point for a free throw, 2 points for a field goal inside the three-point arc, and 3 points for a shot from beyond the arc.

NBA

Four 12-minute quarters (48 minutes total). 5-minute overtime periods.

FIBA / EuroLeague / International

Four 10-minute quarters (40 minutes total). 5-minute overtime periods.

NCAA (College)

Two 20-minute halves (40 minutes total).

Shot Clock

NBA: 24 seconds. FIBA: 24 seconds. NCAA: 30 seconds. Teams must attempt a shot within this window or surrender possession.

24-second reset

The shot clock resets to 14 seconds (NBA) or 14 seconds (FIBA) when the ball hits the rim.

• Free throw — 1 point. Awarded after certain fouls. The shooter stands uncontested at the free-throw line.
• Field goal (inside the arc) — 2 points. Any shot made from within the three-point line.
• Three-pointer — 3 points. Any shot made with both feet behind the three-point arc at the moment of release.
• And-1 — A player scores a field goal while being fouled. They receive the basket plus one free-throw attempt.

Violations result in a turnover — possession is awarded to the opposing team. The most frequent violations in basketball are:

Travelling

Moving both feet without dribbling the ball. Players may take two steps after gathering the ball (three in the NBA's 'gather step' rule).

Double dribble

Dribbling with two hands simultaneously, or picking up the dribble and then dribbling again.

Backcourt violation

Once a team advances the ball past half-court, they cannot return it to the backcourt. NBA teams have 8 seconds to advance; FIBA allows 8 seconds.

Shot clock violation

Failing to attempt a shot before the shot clock expires.

Out of bounds

The ball or ball-handler touches the boundary line or the area beyond it.

Goaltending

Blocking a shot on its downward trajectory or while it's above the rim. Results in the basket being awarded.

Held ball / jump ball

When two opposing players have simultaneous possession, a jump ball or possession arrow determines who gets the ball.

5-second violation

A player in-bounding the ball or under heavy defense must pass or shoot within 5 seconds.

A personal foul is illegal physical contact with an opponent. Personal fouls are tracked per player and per team:

• NBA: Each player fouls out after 6 personal fouls. Teams enter the bonus (opponents shoot free throws) after the 4th team foul per quarter.
• FIBA / EuroLeague: Players foul out after 5 personal fouls. Teams enter bonus after 4 team fouls per quarter.
• Common types: blocking foul (defender's feet not set), charging foul (offensive player runs into a set defender), reach-in, holding, pushing.

Technical foul

Called for unsportsmanlike conduct, arguing with officials, or delay of game. Results in 1 free throw for the opponent and possession.

Flagrant 1

Unnecessary contact — 2 free throws and possession for the fouled team.

Flagrant 2

Unnecessary AND excessive contact — immediate ejection plus 2 free throws and possession.

Offensive players cannot remain in the paint (the key / lane) for more than 3 consecutive seconds while their team has possession. This 'three-in-the-key' rule prevents big men from camping under the basket. Defensively, the NBA also enforces a 3-second defensive rule — defenders cannot remain in the lane for 3 seconds without actively guarding a player.

If the score is tied at the end of regulation, the game moves to overtime — an additional 5-minute period. If still tied after that, additional overtime periods are played until one team leads at the buzzer. There is no sudden-death overtime in basketball.