3-4 Defense

The 3-4 uses three linemen, four linebackers and four defensive backs, with the outside linebackers often standing on the edges to rush.

Tip: Five X's near the line with only two linebackers behind them usually means a 3-4.

How to Spot It

cover0 names fronts by personnel, meaning who is on the field. A 3-4 has three down linemen, four linebackers and four defensive backs. The middle lineman is the nose tackle, who lines up over the center, the offensive lineman who snaps the ball. A defensive end sits on each side of him, usually across from a guard or tackle.

The tricky part is the outside linebackers. In most 3-4 looks they stand up on the edges, just outside the offensive tackles and right at the line. On the diagram that can look like five X's across the front. Count again by depth: five defenders near the line with only two sitting back at linebacker depth usually means a 3-4, with two of those five being linebackers.

The secondary looks like a 4-3's: two cornerbacks over the outside receivers and two safeties deep. If a third cornerback appears over the slot receiver, the inside receiver between the widest man and the line, the defense has gone to Nickel.

When Teams Use It

The 3-4 is a base defense for early downs and heavier offensive groups, like two tight ends or a fullback. Coaches like it because the offense can't easily tell which linebackers will rush the passer and which will drop into coverage.

Many teams known as 3-4 teams spend most of their snaps in Nickel, swapping a linebacker for a fifth defensive back when the offense uses three receivers. Because cover0 counts personnel, those snaps count as Nickel here. That is why the 3-4 share in the plays cover0 draws from swings between about 6% and 15% a season.

History

The 3-4 is usually traced to the 5-2 'Oklahoma' defense, which Bud Wilkinson's University of Oklahoma teams used starting in the late 1940s. When its ends dropped back into pass coverage instead of rushing, it worked much like a 3-4 does today.

Pro teams picked it up in the 1970s. Miami's unbeaten 1972 team had a '53' package, named for linebacker Bob Matheson's jersey number, which added him as a fourth linebacker who could rush or cover. In 1974 Chuck Fairbanks, who had coached at Oklahoma, made the 3-4 the New England Patriots' regular defense with coordinator Hank Bullough. The Patriots even called it the 'Oklahoma Defense.' Bum Phillips installed his own version as Houston's defensive coordinator the same year.

The front had its signature moment in the 1980s. Bill Parcells' 1986 New York Giants rode a 3-4 built around Lawrence Taylor, who had 20.5 sacks that season, to a 39-20 win in Super Bowl XXI. Today the 3-4 lives on mostly as an early-down look, since even its biggest fans play Nickel most of the time.

Coaches Known for It

Bill Arnsparger. Miami's defensive coordinator for the unbeaten 1972 No-Name Defense. His '53' package brought in Bob Matheson as a fourth linebacker who could rush or drop into coverage.

Chuck Fairbanks. Came to the New England Patriots from Oklahoma in 1973 and, with coordinator Hank Bullough, made the 3-4 the team's regular defense in 1974. Patriots owner Robert Kraft credited him with introducing the 3-4 to the NFL.

Bum Phillips. Brought the 3-4 to the Houston Oilers as defensive coordinator in 1974 and kept it as head coach from 1975 to 1980. Nose tackle Curley Culp, acquired in a 1974 trade, anchored a defense that helped Houston reach the AFC Championship Game after the 1978 and 1979 seasons.

Dick LeBeau. Pittsburgh's defensive coordinator from 2004 to 2014, he ran zone blitzes out of the Steelers' 3-4. He was The Sporting News Coordinator of the Year for 2008, and Pittsburgh won Super Bowls after the 2005 and 2008 seasons.

How Often It's Used

Share of the plays cover0 could label each season.

Season	Share
2016	13.6%
2017	14.6%
2018	6.1%
2019	11.4%
2020	8.4%
2021	10.6%
2022	12.6%
2023	8.8%
2024	6.3%
2025	12.2%

Charted by NFL Next Gen Stats through 2022 and by FTN Data from 2023, so part of any jump between 2022 and 2023 comes from the change of source.

Play Today's Plays

More defensive fronts

4-3 DefenseThe 4-3 puts four linemen up front, three linebackers behind them and four defensive backs, and it is the classic early-down base defense.11.2%Nickel DefenseNickel puts five defensive backs on the field, usually with four linemen and two linebackers, and it is now the most common defense in football.65.8%Dime DefenseDime puts six defensive backs on the field, usually with four linemen and one linebacker, to defend obvious passing downs.10.3%Goal Line DefenseGoal Line packs eight or more defenders into the box with three or fewer defensive backs, for plays at the goal line or a yard or two to go.0.6%

Sources

Written for cover0. Usage numbers come from the play data credited on the About page.