The ball must reach the line to gain before the series runs out.

The rulebook used on this page

The primary scope is the 2026 Official Playing Rules of the National Football League, effective for the 2026 NFL season in preseason, regular-season and postseason games. The NFL's listed 2026 amendments do not change the downs or line-to-gain provisions discussed here.

College football is compared in one section using the NCAA's 2025 rules book together with its amendments effective for the 2026 season. High-school, youth, six-player, arena and flag competitions are outside this page's ruling: they may change the number of downs, the distance, field zones and penalty consequences.

Down, series and distance are different things

NFL Rule 3-8 distinguishes the pieces shown on the scoreboard:

• Down: the period from the ball being put in play until it is declared dead. A down begun by a snap is a scrimmage down.
• Series: the set of four consecutive charged scrimmage downs available to the offense.
• Distance: the yards from the ball's next spot to the line to gain.

“Third-and-2” therefore means the third charged down in the current series with the line to gain two yards ahead. A down that is nullified and replayed does not use up the numbered opportunity; a loss-of-down penalty does.

The target is fixed for the series

Rule 3-8-3 places the line to gain 10 yards beyond the spot that starts the series. It does not move backward after a sack or a run for loss; penalties follow Rule 14 and can continue or end the series. If first-and-10 at the A20 becomes second-and-17 at the A13, the original line to gain remains the A30.

If the opponent's goal line is the target because it is no more than 10 yards away, the situation is goal-to-go. The yellow broadcast line is only a visual overlay. The officials' established line to gain controls.

The forward point of the ball decides the distance

Under Rule 7-3-3, officials use the forward part of the ball in its dead-ball position to measure gain or loss. Before a measurement, the ball is rotated with its long axis parallel to the sidelines while its forward-most point is maintained.

The runner's knee, elbow, feet or helmet can establish when the down ends, but those body parts are not the object measured against the line to gain. If contact drives a runner backward, the forward-progress rules protect the spot where the runner's advance ended. The ball must be at or beyond the line to gain at that controlling spot; “almost the full ball” is still short.

How to rule a first-down play

1. Fix the ruleset and series. For this page, use NFL 2026 and the line to gain established for the current series.
2. Identify how the down ended. Locate the controlling dead-ball or forward-progress spot and determine which team has possession at the end.
3. Apply loose-ball and kick rules. A forward fumble, fourth-down fumble or scrimmage kick can produce a different spot from where the loose ball finished.
4. Resolve accepted penalties. Enforcement can repeat the numbered down, add loss of down, put the ball beyond the line, or award a first down.
5. Award the next series. If the offense has possession at or beyond the line to gain, it receives a new series. If it is short after fourth down, the opponent receives one at the proper succeeding spot.
6. Check replay authority. Where available, review concerns the official spot and rule result—not the television line.

A first down can arise without a ten-yard offensive gain

Rule 7-3-1 awards the original offense a new series when the ball is dead in its possession at or beyond the line to gain, when enforcement of a defensive foul places it there or awards an automatic first down, and in specified possession or kick recoveries.

A change of possession normally starts a new series for the team that has the ball at the end of the down. That includes an interception or recovered fumble; it also covers the unusual play in which the original offense loses possession and gets it back before the down ends. A legally recovered free kick, and a kicking-team recovery after the receivers touch a scrimmage kick beyond the line of scrimmage, have their own Rule 7 new-series provisions.

Failure is judged after the full legal result

If Team A is short when its fourth charged down ends, Rule 7-3-2 awards Team B a new series. “Turnover on downs” is the common description, but the next snap is not automatically from the point where a runner fell. The proper spot may instead be set by forward progress, an out-of-bounds rule, fourth-down fumble administration or accepted penalty enforcement.

A punt, field-goal attempt, interception or recovered fumble is not simply a failed conversion. Possession, kick and scoring rules determine the outcome. Punting is a strategic choice, not a requirement of fourth down.

Crossing the marker does not bank a first down before the play ends

Rule 7-3 looks to possession when the ball is declared dead. If a runner crosses the line to gain but fumbles and the defense recovers, the offense does not keep a first down merely because the runner had crossed the marker. The recovering defense receives the new series, subject to penalties and other possession rules.

Rule 8-7-5 adds a fourth-down restriction before a change of possession: only the player who fumbled may recover and advance for Team A. If a teammate recovers, the ball is dead and the next-snap spot is the fumble spot, or the recovery spot if that is behind the fumble. A teammate cannot turn a short fourth-down fumble into a conversion by recovering it farther ahead.

Enforcement—not the flag by itself—sets the next down

NFL Rule 14-1-2 supplies the sequence:

• Accepted Team A distance foul: if the enforced ball is still behind the line to gain, the ensuing down normally keeps the same number. A penalty that includes loss of down advances the number; on fourth down, it awards the ball to Team B.
• Team A still beyond the marker: if the ball remains beyond the line to gain after enforcement, Team A receives first-and-10.
• Accepted Team B foul: the NFL generally makes the next down first-and-10 for Team A. Rule 14 lists ten exceptions—including offside, encroachment, neutral-zone infraction, delay of game and running into the kicker—for which the down and line to gain remain unless the enforced distance itself reaches the marker.
• Declined or offsetting fouls: a declined penalty leaves the play's ordinary down result; offsetting fouls without a change of possession normally replay the down with the same line to gain.

This is why “five-yard defensive penalty” does not by itself tell the viewer whether the result is a first down. The foul category, acceptance, enforcement spot and the NFL exception list all matter.

The goal line replaces the ordinary ten-yard target

If the opponent's goal line is no more than 10 yards beyond the series spot, Rule 3-8-3 makes the goal line the line to gain. The offense cannot earn another first down merely by advancing to a point short of the goal line.

Goal-to-go describes the target, not a promise that every later distance will be under 10 yards. For example, an accepted offensive holding penalty on first-and-goal can leave first-and-goal from more than 10 yards away because the same series and goal-line target continue. If enforcement instead awards a new series, the new line to gain is established from the succeeding spot under the normal rule.

Technology measures the spot; it does not choose it

Beginning with the 2025 season, the NFL replaced on-field chain measurements with its virtual line-to-gain measurement system, while retaining the physical chain crew as a backup. Officials still determine forward progress and manually spot the ball. The system compares that placed ball with the established line to gain; it does not decide when the runner was down.

Under 2026 Rule 15-3-7, the dead-ball spot is reviewable to determine whether it was short of, at or beyond the line to gain, and a ruling changes only on clear and obvious video evidence. A fourth-down ruling that the offense failed is among the plays for which the Replay Official may initiate review. A coach may challenge other eligible line-to-gain rulings when Rule 15's timing, timeout and challenge limits permit.

The four-and-ten baseline does not make the codes interchangeable

For the 2026 college season, the NCAA's controlling set is its 2025 Football Rules Book plus the changes approved for and effective with the 2026 season. The 2026 amendment notice does not change NCAA Rule 5, “Series of Downs, Line to Gain.” That rule likewise provides up to four scrimmage downs and normally establishes the line to gain 10 yards ahead, with the goal line taking over when the ordinary line would be in the end zone.

The administration differs. NCAA Rule 5 has its own down-after-penalty provisions and provides a physical measurement for questionable first-down distance; it does not use the NFL's Rule 14 exception structure or the NFL virtual-measurement procedure. A college viewer should apply the NCAA rule and any division or competition regulations rather than importing an NFL penalty result.

The ball reaches the plane as the knee comes down

Situation: NFL 2026, third-and-2 at the A40. The line to gain is the A42. After defensive contact, the runner's knee touches at the A41 while the forward point of the possessed ball has reached the vertical plane of the A42.

Ruling: first down for Team A at the forward-progress spot. The knee ends the down, but the ball's forward point supplies the measurement. Being at the line to gain is enough under Rules 7-3-1 and 7-3-3.

A teammate recovers a fourth-down fumble beyond the marker

Situation: NFL 2026, fourth-and-1 at the A40. The runner fumbles at the A40½. A teammate recovers at the A42 before any defensive possession.

Ruling: Team B's ball, first down. Under Rule 8-7-5, the teammate's recovery makes the ball dead and the next-snap spot returns to the A40½ because that is behind the recovery. Team A is short of the A41 line to gain.

Offside moves the ball but does not automatically renew the series

Situation: NFL 2026, second-and-7 at the A30, line to gain A37. Team B is offside and the five-yard penalty is accepted.

Ruling: second-and-2 at the A35. Offside is one of Rule 14-1-2's Team B exceptions, and five yards has not reached the line to gain. With third-and-3 from the A34, the same five-yard enforcement would place the ball beyond the A37 and produce first-and-10.

A first-and-goal penalty can create a long goal-to-go

Situation: NFL 2026, first-and-goal at the B8. During an incomplete pass, Team A commits offensive holding, enforced 10 yards from the previous spot.

Ruling: first-and-goal at the B18. The accepted Team A distance foul keeps the down number under Rule 14-1-2, while the existing series still has the goal line as its line to gain. The display is not first-and-10.

Claims that miss the decisive fact

• “The runner crossed, so the first down was secured.” Possession and the final rule-administered spot still matter until the down ends.
• “The knee was short, so the ball was short.” The knee can end the down; the forward point of the ball determines the distance.
• “The yellow line proves it.” It is a broadcast aid, not the official line to gain.
• “Every defensive penalty is an automatic first down.” NFL Rule 14 has named exceptions, and distance can still reach the marker.
• “A fourth-down recovery ahead always counts.” Rule 8 restricts Team A teammate advancement of a fourth-down fumble.
• “NFL and college use the same result.” Their penalty and measurement administration differ even where both begin with four downs and 10 yards.

Governing-body sources and effective versions

• National Football League — 2026 NFL Rulebook hub and 2026 amendment list
• National Football League — 2026 Official Playing Rules of the National Football League, Rules 3-8, 7-3, 8-7, 14-1 and 15
• NFL.com — 2025 virtual line-to-gain measurement implementation report
• NCAA — current Football Rules of the Game hub
• NCAA — 2025 Football Rules Book, Rule 5
• NCAA — 2026 Football Rules Changes, approved March/April 2026 and effective with the 2026 season

Checked against the NFL rulebook effective for the 2026 season and the NFL's current measurement procedure. The NCAA comparison was checked against the NCAA's current rules hub, 2025 book and 2026 amendment notice. High-school, youth, flag and other competition rules are not covered and may replace this baseline.