American football is a game of territory, possession and scoring. Two teams of 11 players try to move the ball into the opponent’s end zone, while the defense tries to stop them or take possession.
This guide explains the main rules of the NFL: downs, scoring, positions, penalties, game time and changes of possession. It focuses on the rules that help a new viewer follow a game without relying on outdated player statistics or a particular season’s roster.
1. The field and teams
An NFL field is 120 yards long from end line to end line: 100 yards of playing field plus a 10-yard end zone at each end. It is 53⅓ yards wide. Each team has 11 players on the field during a normal play. Teams substitute players between plays according to the rules and personnel needs.
The team with the ball is the offense. The team trying to stop it is the defense. Special-teams units handle kickoffs, punts, field-goal attempts and extra-point tries.
2. Downs: how a team keeps possession
The offense usually has four downs to advance the ball at least 10 yards. If it reaches the line to gain, it receives a new set of four downs. If it fails to reach the required distance by fourth down, possession normally goes to the opponent at the end of the play—unless the offense punts, attempts a field goal, or successfully runs another fourth-down play.
- 1st down: the start of a new series of attempts.
- 2nd and 3rd down: the offense tries to gain the remaining yards.
- 4th down: the offense decides whether to attempt the first down, punt the ball or try a field goal, depending on the situation.
3. How scoring works
- Touchdown — 6 points: a player carries the ball across the opponent’s goal line or catches a legal pass in the end zone.
- Extra point — 1 point: after a touchdown, the team may kick the ball through the uprights.
- Two-point conversion — 2 points: instead of kicking the extra point, the team may run or pass the ball into the end zone on a try.
- Field goal — 3 points: a placekick through the uprights during a play.
- Safety — 2 points: typically scored when the offense is downed with the ball in its own end zone or commits a qualifying foul there.
4. The main positions
- Quarterback (QB): receives the snap and passes, hands off or runs with the ball.
- Running back (RB): carries the ball on designed runs and may catch passes.
- Wide receiver (WR): runs routes to catch passes.
- Tight end (TE): can block defenders and serve as a receiver.
- Offensive line: blocks defenders to protect the quarterback and open running lanes.
- Defensive line and linebackers: help stop the run and pressure the quarterback.
- Cornerbacks and safeties: defend receivers and help prevent completed passes.
- Kicker and punter: handle placekicks, kickoffs and punts on special teams.
5. Game time and the clock
A regulation NFL game has four 15-minute quarters. The clock stops and starts under specific rules—for example, following certain incomplete passes, plays that end out of bounds, scores, timeouts and officiating stoppages. Because of these stoppages, a game usually takes considerably longer than 60 minutes of real time.
Each team has timeouts it can use to stop the clock strategically. The NFL also has a two-minute warning near the end of the second and fourth quarters, as specified in the rulebook.
6. Common penalties
Penalties are called when a player or team breaks a rule. The consequence depends on the foul: officials may move the ball by a set distance, enforce a result such as an automatic first down, or apply other remedies defined in the rules.
- False start: an offensive player makes an illegal movement before the snap.
- Offside: a player is illegally positioned across the line of scrimmage at the snap in a way covered by the rule.
- Holding: a player illegally grabs or restrains an opponent.
- Pass interference: illegal contact that materially hinders an eligible receiver or defender during a pass play, subject to the rule’s conditions.
- Delay of game: the offense fails to put the ball in play before the play clock expires.
7. How possession changes
Possession can change when a team scores and kicks off, punts on fourth down, fails to gain the line to gain, throws an interception, or loses a fumble that the opponent recovers. A turnover can quickly shift field position and scoring opportunities, which is why protecting the ball matters so much.
8. What a new viewer should watch
Start by tracking the down and distance shown on the broadcast. Then note the field position, the score and how much time remains. These four details explain why a team might run the ball, throw deep, punt or attempt a field goal. Commentators often discuss formations and coverages, but understanding down-and-distance makes the strategy much easier to follow.
Official rules and further reading
The NFL’s official rulebook is the authority for detailed rulings and exceptions. This article is a beginner’s overview rather than a replacement for the full rules.
- NFL Football Operations: 2026 NFL Rulebook.
- NFL Football Operations: Football Terms — official definitions for downs, touchdowns, turnovers and more.
Editorial note: Refreshed October 26, 2026. Outdated 2022–2023 player stat cards have been removed so the guide remains useful to readers across seasons.