A quarterback who throws for 4,500 yards can look dominant or look like a game-manager who needed 650 attempts to get there. Yards per attempt (Y/A) strips away the attempt count and tells you what actually happened on each throw.
What Passing Yards Actually Measure
Total passing yards are a counting stat. They accumulate with volume — more attempts, more completions, more opportunities created by falling behind late in games. A quarterback trailing by 17 points in the fourth quarter will throw far more than one protecting a lead, inflating raw yardage without reflecting any improvement in throwing quality.
Game script is the biggest distortion. Teams that play from behind are forced to abandon the run and pass repeatedly in obvious situations, handing their quarterback padded yardage totals against defenses in coverage-preventing-the-big-play mode. Teams that lead run the ball and take clock, so their quarterback accumulates fewer attempts and fewer raw yards — even when the quarterback was the primary reason the team got ahead in the first place.
The result: raw passing yards conflate efficiency with opportunity. A back-up elevated midseason on a 2-win team can post 3,800 yards. That number tells you his team passed a lot. It tells you very little about how well he threw.
How Yards per Attempt Works
Y/A is the simplest normalization available: total passing yards divided by total pass attempts.
Y/A = Passing Yards ÷ Pass Attempts
Because it divides out attempts, the stat answers a different question than raw yards: not how much did he accumulate, but how much did he gain each time he pulled the trigger. A quarterback with 3,200 yards on 400 attempts (8.0 Y/A) generated more value per throw than one with 4,000 yards on 600 attempts (6.7 Y/A), even though the second quarterback's box score looks bigger.
Pro Football Reference, the standard public database for NFL historical data, carries Y/A as a primary passing column precisely because it normalizes across different usage profiles — see their passing glossary.
What Y/A Captures That Completion Percentage Misses
Completion percentage tells you how often a quarterback connected with a receiver, but it rewards short, safe throws as much as downfield strikes. A quarterback who completes 72% of his passes on 4-yard checkdowns scores well. One who completes 60% while averaging 12 yards per completion may be generating far more real value per snap.
Y/A captures both accuracy and aggressiveness. A 7-yard completion and a 35-yard completion both count as completions for completion percentage; for Y/A, they are not remotely the same event.
Adjusted Yards per Attempt Adds Turnover Penalty
The base Y/A formula ignores turnovers. Adjusted Y/A (AY/A) corrects that by adding yards for touchdowns and subtracting yards for interceptions. Pro Football Reference defines the standard adjustment as:
AY/A = (Passing Yards + 20 × TD − 45 × INT) ÷ Attempts
The 20-yard bonus per touchdown and 45-yard penalty per interception are empirical calibrations built to reflect the real scoring-drive value those outcomes create or destroy, as documented in the Pro Football Reference glossary. AY/A is useful when comparing quarterbacks across contexts where turnover rates differ meaningfully.
Worked Example: Two Quarterbacks, Same Week
Take two hypothetical stat lines from the same week:
Quarterback A: 38 attempts, 312 yards, 2 TD, 0 INT Quarterback B: 54 attempts, 398 yards, 2 TD, 2 INT
Raw yards favor Quarterback B, 398 to 312. But run the yards per attempt calculation on each:
- QB A Y/A: 312 ÷ 38 = 8.2
- QB B Y/A: 398 ÷ 54 = 7.4
And with the AY/A adjustment:
- QB A AY/A: (312 + 40 − 0) ÷ 38 = 352 ÷ 38 = 9.3
- QB B AY/A: (398 + 40 − 90) ÷ 54 = 348 ÷ 54 = 6.4
Quarterback B's two interceptions — each costing 45 adjusted yards — collapse his value metric from a respectable-looking 7.4 to a below-average 6.4. Quarterback A, despite the smaller raw yardage number, was considerably more productive per attempt once turnover cost is included.
This is exactly the scenario raw yardage hides.
Thresholds Worth Knowing
Historical NFL data at Pro Football Reference's career Y/A leaderboard shows the all-time career leaders clustered between 8.0 and 9.0 Y/A. For a single season, a Y/A above 8.0 is elite; 7.0–7.9 is solid starter range; below 6.5 over a full season typically correlates with poor offensive output regardless of total yardage volume.
Those are descriptive benchmarks drawn from historical distributions, not official league thresholds. Sample size matters — Y/A over 20 attempts is noisy; Y/A over a full 16- or 17-game season is stable and meaningful.
Y/A Inside the NFL Passer Rating Formula
Y/A's importance is embedded in the NFL's own official passer rating. The NFL's passer rating formula is a composite of four components: completion percentage, yards per attempt, touchdown rate, and interception rate. Y/A is one of the four equal pillars — the league's own methodology treats it as fundamental to QB evaluation, not supplementary to it.
Passer rating's formula caps and floors each component to prevent extreme outliers from dominating the composite, which is a useful property for a single-number summary. Y/A used on its own doesn't cap, which means a handful of 50-yard bombs can move it meaningfully — worth keeping in mind for small sample sizes.
Frequently asked questions
How many attempts does Y/A need before it's reliable?
Roughly 200 or more attempts in a single season produces a reasonably stable Y/A. Below that threshold — say, a backup who started four games — individual big plays can shift the number by half a yard or more, making cross-player comparisons unreliable. For single-game analysis, treat Y/A as descriptive rather than predictive.
Is Y/A the same as yards per completion?
No. Yards per completion divides total yards by completions only, so incompletions don't factor in. Y/A divides by all attempts, including incompletions and sacks (in some formulations). A quarterback who throws nine incompletions attempting deep routes will show a lower Y/A than his yards-per-completion number — Y/A penalizes attempts that gain nothing; yards per completion does not.
Does Y/A account for sacks?
Standard Y/A uses pass attempts as the denominator, and in official NFL box scores, sacks are recorded separately as rushing plays rather than pass attempts. That means standard Y/A does not include sacks. Net yards per attempt (NY/A) adjusts for this by subtracting sack yardage from the numerator and adding sack attempts to the denominator, giving a cleaner picture of true cost-per-dropback.
Why do analysts use AY/A instead of passer rating for quick comparisons?
Passer rating's capping mechanism — each component is bounded between 0 and 2.375 — means truly exceptional or terrible performances get compressed toward the scale's limits. AY/A has no cap, so it remains sensitive to extreme outcomes and is arithmetically simpler to compute and interpret. Both metrics use Y/A as their foundation; the choice between them usually comes down to whether you want the NFL's standardized composite or an uncapped linear estimate.
Can Y/A compare quarterbacks across different eras?
With caution. Passing-friendly rule changes since 2004 — particularly restrictions on defensive contact — have raised league-average Y/A across the board. Comparing a 1970s quarterback's 6.8 career Y/A to a 2020s starter's 7.1 without era adjustment overstates the gap. Era-adjusted Y/A, available through Pro Football Reference's historical tables, normalizes each season against the league average in that year for valid cross-era comparison.
Informational only, not professional advice.