Personnel Groupings: What 11 Personnel and 12 Personnel Mean

By 4Football Staff · September 30, 2026 · 10 min read

Two digits describe who is on the field for the offense: how many running backs and how many tight ends. Decode 11, 12, 21 and the rest, and see why defenses answer in kind.

Listen to an NFL or college broadcast long enough and a pair of numbers starts to appear. "They are in 11 personnel." "Now it is 12 personnel, so expect a run." "Out of 21 personnel they never throw." The numbers sound like code, and in a way they are, but the code is simple, and learning it gives you an easy way to read what an offense is trying to do before the ball is snapped.

This guide explains how to decode the numbers, what the most common groupings mean, why defenses change their own lineups in response and what the system does not tell you. You will also learn how personnel differs from formation, the term people often confuse it with.

The code: two digits, five skill players

Football offenses always have eleven players on the field. Five of them are offensive linemen and one is the quarterback. The remaining five are the skill players: running backs, fullbacks, tight ends and wide receivers. The personnel number describes how those five are split.

• The first digit is the number of running backs. Fullbacks count as running backs for this purpose.
• The second digit is the number of tight ends.
• The wide receivers make up the rest of the five. They are not named in the number, but you can find them by subtracting the two digits from five.

So 11 personnel means one running back, one tight end and three wide receivers, because 5 - 1 - 1 = 3. 12 personnel means one back, two tight ends and two receivers (5 - 1 - 2 = 2). 21 personnel means two backs, one tight end and two receivers.

That is the entire system. Nothing in the numbers tells you where those players stand. Two teams with the same personnel can line up in different shapes, which is why personnel and formation are different ideas. Our guide to offensive formations covers the shapes. Personnel only says who is on the field.

A note on the assumption

The system assumes five offensive linemen and one quarterback, which describes nearly every snap. If a team puts in a sixth lineman, usually as a blocker for a short-yardage or goal-line play, the broadcast will usually mention "an extra lineman" or "six offensive linemen" separately, since the two-digit code cannot express it. In that case the five skill-player slots are reduced to four.

The groupings you will hear most

The right-hand column is a tendency, not a rule. A team can run effectively from 10 personnel and can throw from 22. But the pattern gives you a reasonable first guess, and it is the guess defenses make as well.

11 personnel: the modern default

11 personnel has been the most commonly used grouping in the NFL for many years, and it is widely used in college and high school football as well. The appeal is flexibility. With three wide receivers, a tight end and a back, the offense can throw to four or five targets, split the receivers wide to stretch the defense, or run the ball with a back behind a line that has an extra blocker in the tight end.

Because 11 personnel puts three receivers on the field, defenses often answer with a nickel package, which swaps a linebacker for a third cornerback. We cover those lineups in our guide to nickel and dime packages. The offense is, in effect, forcing the defense to take a bigger run-stopper off the field and put a smaller defensive back on it.

A hypothetical illustration: say an offense lines up in 11 personnel with the tight end next to the left tackle, two receivers split to the right and one to the left. The defense sees three receivers and responds with a nickel. If the offense then runs the ball with the back, the defense has a lighter player where a linebacker would usually be, and the offense has gained a small blocking advantage. If the offense throws, the defense has the coverage it wanted. The skill is knowing which choice the defense is leaving open.

12 personnel: the extra tight end

12 personnel swaps a wide receiver for a second tight end. The effect depends on the tight end.

• If the second tight end is a strong blocker, the offense gets a bigger, more physical line of scrimmage and a better running look.
• If the second tight end is also a receiver, the offense gets a pair of pass-catchers who can split out wide, line up next to the tackle or move around the formation.

The grouping is useful because it forces the defense to decide what it expects. A defense can stay in its base lineup (with three linebackers) and risk being outflanked in coverage, or it can go to a nickel and risk being overpowered in the run. Offenses that use 12 personnel often try to present a run look and then throw, or the other way around. We discuss that idea of faking one thing and doing another in our guide to pre-snap motion and shifts, because movement is another tool to hide the intent.

21 and 22: the fullback groupings

21 personnel includes two running backs, which in practice usually means a tailback and a fullback. 22 personnel adds a second tight end and takes away a receiver. These groupings are associated with power running: a fullback leads through the hole, tight ends block on the edge and the tailback follows.

They were once the standard way to run an NFL offense, and in some schemes they remain important. With only one or two receivers, the groupings narrow the passing game, which is why defenses often assume a run when they see them. Teams use that assumption against defenses. A play-action pass from 21 or 22 personnel can be especially effective because the fake has been the dominant tendency.

The extremes: 10 and empty

At the other end of the spectrum, 10 personnel (one back, no tight ends, four receivers) and empty sets (no back) spread the defense across the width of the field. The defense has to cover receivers from sideline to sideline, so it typically goes to a nickel or dime package, with five or six defensive backs. Offenses use these groupings in obvious passing situations and when they want to spread a team that is strong against the run.

The risk is protection. With no back in the backfield, the offense has only five linemen to block the pass rush, and the defense can send more rushers than the offense has blockers. The quarterback must get rid of the ball quickly or know where the extra rusher is coming from.

How the defense responds

Defenses have their own shorthand, and it mirrors the offense. A base defense usually has four defensive linemen and three linebackers, and it is built to stop the run. Nickel uses five defensive backs, and dime uses six. The more receivers the offense puts on the field, the more defensive backs the defense wants.

Because defenses answer the personnel, offenses can use personnel to dictate matchups. Put in a receiver and the defense takes out a linebacker. Put in a fullback and the defense may take out a defensive back. The offense then looks for the player on the other side who is weaker in that role.

The substitution game

This back-and-forth raises a question: how quickly can the offense change its personnel, and what can the defense do about it? The answer is governed by substitution rules that vary somewhat across levels.

In general, an offense that substitutes players must give the defense a chance to respond to the change, so the defense cannot be caught with the wrong group on the field. In the NFL, officials may hold up the snap briefly when a substitution has just occurred. On the other hand, an offense that uses a no-huddle approach can limit the defense's time to change by lining up quickly with the same personnel. That is one reason fast-tempo offenses often keep the same eleven on the field for many plays in a row.

Both teams must also keep to the limit of eleven players. A team with too many players on the field at the snap draws a penalty, which we cover in our article on illegal substitution and too many men on the field. The exact procedures differ among the NFL, college football and high school, so check the current rulebook for your level.

Three snaps, three answers

A hypothetical drive shows how the game of offering and answering works. On first down the offense comes out in 21 personnel with a fullback. The defense, expecting a run, stays in its base lineup with three linebackers, and the tailback gains a few yards. On second down the offense stays in 21 personnel and fakes the handoff before throwing to the tight end, who has slipped behind a linebacker pulled toward the line. On third down the offense substitutes a receiver for the fullback, moving to 11 personnel, and the defense must respond with a nickel back.

Notice what happened. The first two snaps used identical personnel and produced different plays, and the third changed the personnel to change the defense. No single snap proved anything about what the offense prefers, but the sequence shows how coaches use groupings to build a pattern and then break it. Over a full game, the choices an offense makes in each grouping are what analysts mean by "personnel tendencies."

Personnel at other levels

The two-digit code comes from the professional game, but the idea applies everywhere. College offenses use the same shorthand. In high school and youth football the vocabulary is less common, partly because many teams have fewer specialized players and some players serve in several roles. A high school team may have only one player who can play tight end, or use a running back as a receiver, and its coaches may describe its sets by formation names or by letters and numbers of their own. The counting method still works if you want to apply it to a game you are watching, but do not assume a local coach uses the same words.

What personnel does not tell you

The numbers are useful, but they have limits.

• They do not describe the players. A tight end can be a blocker or a receiver. A running back can be a power runner or a receiving specialist. Two teams in 11 personnel can have very different offenses.
• They do not describe alignment. A tight end can line up next to the tackle, in the slot or out wide. The same personnel can look like a run formation or a spread.
• They do not predict the play. Tendencies are real, but the best offenses use personnel to look like one thing and do another.
• They count positions, not jersey numbers. A player may be listed at one position and used at another, particularly in modern offenses that use hybrid players.

A note for fantasy managers

Personnel affects how often players are on the field, which affects their opportunity. A wide receiver on a team that mostly uses 12 personnel may be on the field less often than one on a team that mostly uses 11. A tight end who is a strong blocker may play often but catch fewer passes. If you manage a fantasy team, our fantasy resources and the injury report are useful companions: an injury to a second tight end, for example, can change which personnel group a team prefers, and it can change the target distribution among the remaining players.

Reading personnel on game day

You do not need an expert to spot personnel from your couch.

1. Count the running backs and fullbacks in the backfield. That is your first digit.
2. Count the tight ends. They line up on the ends of the offensive line or close to it. That is your second digit.
3. Count the receivers, then check: backs + tight ends + receivers should equal five.
4. Look at the defense. Count the defensive backs and linebackers. Did the defense change its lineup after the offense did?

If you watch a few series this way, you will begin to see the pattern the coaches are playing: the offense offers a personnel group, the defense answers, and each side tries to exploit the answer. For information about the players on a particular roster, visit the teams and players pages.

The short version

• Personnel is written as two digits: the first is the number of running backs, the second is the number of tight ends, and the rest of the five skill players are wide receivers.
• 11 personnel is one back, one tight end and three receivers, and 12 personnel is one back, two tight ends and two receivers.
• 21 and 22 personnel use a fullback and lean toward power running; 10 and empty sets spread the defense with four or five receivers.
• Defenses respond with base, nickel or dime packages, depending on how many receivers the offense uses.
• Personnel is not formation: it says who is on the field, not where they stand.
• Tendencies are only tendencies, and good offenses use them to disguise what they plan to do.