The Rules of American Football Step by Step: A Guide for New Viewers
The rules of American football look complicated only at first glance. Once you know a few basic terms, like downs, touchdowns and penalties measured in yards, watching a game gets easier. Can you pick it all up in one evening? You can, because the whole game is built on a handful of recurring rules. This guide explains them one at a time, from the field to the scoring, and closes with tips for putting that knowledge to use while you watch.
The field and the teams: where does a game begin?
Each team puts 11 players on the field. The playing surface runs 100 yards between the goal lines, plus another 10 yards for the end zone at each end.
To score, a team has to get the ball into the end zone. A game opens with a kickoff, after which one team receives the ball and starts its drive. The ball can be run or thrown forward, but only one forward pass is allowed on each play. That limit keeps play orderly and gives every play a clear start and finish. As a viewer, you only have to track who has the ball and which way the play is heading.
Game time and the clock: how long does a game last?
In the NFL and in college play, a game has four quarters of 15 minutes of playing time. The clock stops at times during play, though, so a game usually lasts more than three hours. Do not be surprised if a broadcast runs longer than the scoreboard suggests.
Teams have limited time between plays. The play clock in the NFL and the NCAA is 40 seconds, so the offense cannot take all the time it wants to prepare. Each team also gets three timeouts per half, and unused timeouts do not carry over. Keep that in mind when tension builds near the end of a half, because coaches must decide whether to stop the clock or save their timeouts for later.
Downs in American football: the heart of the rules
A down is one of the four tries a team on offense gets to gain at least 10 yards. If it makes it, the offense earns a first down and a fresh set of four tries. That is how a team can hold on to the ball for many plays.
If the offense fails to cover those ten yards in four tries, the defense takes over the ball. This is called a turnover on downs. It is why coaches watch yardage so closely, and why you can easily tell whether the offense is in a comfortable spot or has to take a risk.
Under this system, each try carries a different weight. At the start of a series, the offense can aim to pick up a few yards, but on fourth down the choice gets harder. The team can gamble and go for the remaining yards to earn a first down. It can also take a safer route: a field goal for 3 points, or handing the ball to the other side. Every decision has consequences for the rest of the game, and soon you will be able to judge for yourself whether the coach took a risk or played it safe.
Scoring in American football: what is each play worth?
Scoring is simpler than it looks. A touchdown is worth 6 points, and a field goal is worth 3. After a touchdown, the team can kick an extra point for 1 point or go for a two-point conversion, which earns 2. A safety gives the defense 2 points.
These scoring rules explain many of a coach's decisions. A touchdown is worth the most, but a field goal can be a sensible choice when the offense does not want to give up the ball without scoring. After a while, you will start to predict what the coaching staff will choose.
Penalties and fouls: what do the yellow flags mean?
Typical penalties are 5, 10 or 15 yards. The most common is the false start, when an offensive player moves too soon, which costs 5 yards. Personal fouls usually carry a 15-yard penalty, so they can change the situation on the field a great deal.
A special rule covers defensive pass interference. When the defense commits this foul, the offense automatically gets a first down. For a beginner, that is a useful example of how penalties can do more than push the ball forward or back: they can also hand the offense a fresh set of tries. When you see a flag, check how many yards the penalty is worth and whether it changes the number of tries the offense has.
How do you watch a game step by step?
Begin by asking which team has the ball and what down the offense is on. That tells you whether the team is close to a first down or has to take a risk. Downs give the whole game its structure.
Next, look at the clock and at how many timeouts each team has left. When little time remains in a half, the rules have their greatest influence on coaching decisions. Finally, watch the score. You already know a touchdown is worth 6 points and a field goal 3, so it is easy to work out how many points a team needs to tie.
Summary
The basics of American football are 11 players per side, four tries to gain 10 yards and a clear scoring system. Once you understand downs, touchdowns and the basic penalties, your next game will be easier to follow. Keep exploring the sport with our other guides.