What Is a First Down in Football?

A first down in football is the start of a fresh set of four plays, called downs, in which the offense must advance the ball at least 10 yards. Gain those 10 yards and the offense earns another first down and four new downs; fail, and possession usually goes to the other team. The first-down system is the engine that keeps an NFL drive moving, and understanding it is the fastest way to make sense of the game.

Downs and the line to gain

Every time an offense takes possession, it is given a series of four downs to move the ball forward. When a set begins, the officials establish a “line to gain” 10 yards ahead of the spot of the ball. If the offense reaches or crosses that line within its four downs, it is awarded a new first down, the line to gain resets another 10 yards downfield, and the count starts over at first down again.

You will hear this described as the down and distance: “first and 10” means it is first down with 10 yards to go, while “second and 6” means it is second down with 6 yards still needed. The distance shrinks as the offense gains ground and resets to 10 whenever a new first down is earned.

How the four downs play out

On first and second down, offenses tend to be balanced, mixing runs and passes to chip away at the distance. Third down is the pivotal play: if the offense has not yet reached the line to gain, this is often its last realistic chance to keep the drive alive, so play-calling frequently targets exactly the yardage needed. Fourth down forces a decision, which we cover below.

Because each first down buys four more plays, a team that keeps converting can march the length of the field without ever surrendering the ball. A drive that repeatedly “moves the chains” is one of the most reliable ways to control a game.

What happens on fourth down

If an offense has not gained its 10 yards by fourth down, it faces a choice. It can punt the ball away to push the opponent back, attempt a field goal if it is close enough to the goalposts, or “go for it” and try to gain the remaining distance on one more play. If the team goes for it and comes up short, the result is a turnover on downs: the defense takes over at that spot with strong field position. That risk is why punting and field-goal attempts are common on fourth down.

First downs from penalties

Yardage is not the only way to earn a first down. Certain penalties against the defense carry an automatic first down as part of the punishment. Defensive pass interference, defensive holding, and roughing the passer are common examples. When one of these is called, the offense is awarded a new first down even if the play itself gained little or no ground. If you want the full picture of one of these fouls, see our explainer on pass interference.

The chains and measurements

On the sideline, a crew operates a 10-yard chain linking two poles that physically mark the start of a set and the line to gain. When a play ends near the line, officials can bring the chain onto the field for a measurement to determine, quite literally by the length of the chain, whether a first down was gained. This is why fans talk about “moving the chains.” Broadcasts also add a computer-generated yellow line to show the line to gain on screen, though only the on-field chains are official.

Why first downs matter

First downs are a core measure of offensive success. A team that converts a high share of its third-down and fourth-down chances tends to sustain longer drives, score more, and keep its defense rested. According to the NFL rulebook, the down-and-distance system applies the same way across the field until a team reaches scoring range, where the goal line replaces the usual 10-yard target. Once you grasp how first downs work, related concepts fall into place, from clock management to the value of a converted two-point conversion after a touchdown. And when a game stays level at the end of regulation, the same drives carry into overtime, where every first down becomes even more precious.