The 17 Official Rules of Soccer According to FIFA

Soccer game in action with referee on the field.

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Every year, soccer's international governing body revises and updates their rule book, known as the "." These 17 rules govern everything from how fouls are defined to the type of uniforms that players may wear. The Fédération Internationale de Football Association (FIFA) may make minor or major changes to the rule book.

1. The Field of Play

There are very few fixed dimensions for , even at the highest level. FIFA only stipulates that for professional 11-versus-11 competition, the length must be between 100 yards and 130 yards and the width between 50 and 100 yards. Regulations also stipulate the dimensions of the goal post and field markings.

2. The Soccer Ball

The circumference of a soccer ball must not be more than 28 inches (70 centimeters) and not less than 27 inches. The ball, as used by ages 12 and above, may not weigh more than 16 ounces and not less than 14 ounces at the start of a match. Other guidelines cover replacement balls used during a match and what to do if a ball is defective.

3. The Number of Players

A is played by two teams. Each team may have no more than 11 players on the field at any one time, including the goalkeeper. A match may not start if either team has fewer than seven players. Other regulations govern player substitutions and penalties for too many players on the field.

4. The Players' Equipment

This rule outlines the equipment that players may and may not wear, including jewelry and clothing. A standard uniform consists of a shirt, shorts, socks, shoes, and shinguards. Revisions to the rules include a ban on the use of electronic communications equipment.

5. The Referee

The has the full authority to enforce the laws of the game and all decisions are final. The referee ensures that the ball and players' equipment meets the requirements, acts as timekeeper, and stops play for infringement of the laws, among several other duties. The rules also outline proper hand gestures for signaling rulings.

6. Other Match Officials

In professional soccer, there are two assistant referees whose job it is to call offsides and throw-ins and help the referee make decisions. Carrying a flag to signal their observations, assistant referees, or linesmen as they are commonly known, must monitor the sidelines and goal lines and flag if the ball goes out of play, signaling which team the should be awarded to.

7. The Duration of the Match

Matches consist of two 45-minute halves with a halftime interval of no more than 15 minutes. A referee may play added time because of substitutions, assessment of injuries, removal of injured players from the field of play, time wasting, and any other cause. An abandoned match is replayed unless the competition rules state otherwise.

8. The Start and Restart of Play

The rule book outlines in detail the procedures for starting or restarting play, also known as a kick-off. The opening kick-off of the match is decided by a coin toss. All players must be on their respective sides of the field during the kick-off.

9. The Ball in and out of Play

This section defines when the ball is in play and out of play. In essence, the ball is in play unless it has rolled across the goal line, the touchline, or the referee has stopped play.

10. Determining the Outcome of a Match

Goals are defined as when the ball completely crosses the goal line unless a foul has been committed by either side in the course of scoring. Policies are made for penalty kicks as well. Rules have been added to govern instances when the goalie commits a penalty.​

11. The Offside

A player is in an position if he is closer to the goal line than both the ball and the second-to-last defender, but only if he is in the opposition half of the field. The law states that if a player is in an offside position when the ball is played to him or touched by a teammate, he may not become actively involved in the play. Revisions to rules include provisions defining penalties for a player who commits an infraction while offsides. 

12. Fouls and Misconduct

This is one of the most extensive sections of the rule book, outlining the myriad infractions and their penalties, such as dangerous behavior on the part of a player, and guidelines for how officials should respond to such behavior. This section was also revised extensively in the latest version, clarifying and expanding the definitions of bad behavior.

13. Free Kicks

This section defines the different kinds of (direct and indirect) as well as the proper procedure for initiating them. It also outlines specific penalties that trigger the free kick.

14. The Penalty Kick

As with the previous section, this law defines the proper procedure for and penalties that would call for initiating a penalty kick. Although a player may feint as he or she approaches the ball for the kick, it must be done during the run-up. Feinting after will result in a penalty. The section also outlines where a referee should place the ball for a kick.

15, 16, 17. Throw Ins, Goal Kicks, and Corner Kicks

When the ball goes out of play over the touchline, a throw-in will be taken by a player from the team who did not touch the ball last. When the whole of the ball goes over the goal line, a goal kick or corner is awarded, depending on which team touched the ball last. If the defending team touched it, a corner is awarded to the opposition. If the attacking team had the last touch, a goal kick is awarded.

Source

"Laws of the Game." The International Football Association Board, 2017/18.