What Is CPOE? Completion Percentage Over Expected and Fantasy Football Explained
A quarterback can complete more passes and still have the less impressive completion performance. That is the problem completion percentage over expected, usually shortened to CPOE, helps you investigate. It compares the completions a passer produced with the completions a model expected from the throws being evaluated. It is a lens on passing performance, not a complete quarterback ranking and not a fantasy scoring category.
Information cutoff: October 19, 2026, 9:15 AM Central. This is an evergreen methodology guide, not a Week 6 leaderboard. All numerical examples are hypothetical Football Nation teaching examples. Football Nation interpretation and decision advice are labeled below; no invented player statistics or current rankings are used.
The formula: subtract percentages, not completions
The nflreadr Next Gen Stats dictionary describes expected completion percentage as the expectation built from a passer’s completion probabilities, and completion percentage above expectation as actual versus expected completion percentage. For this guide, CPOE means actual completion percentage minus expected completion percentage on the same eligible attempts. The answer is expressed in percentage points.
If a passer completes 24 of 40 attempts, the actual rate is 60%. If the probabilities on those same 40 attempts sum to 22 expected completions, the expected rate is 55%. Subtract 55 from 60: the result is plus 5 percentage points. He completed two more passes than the model expected, not five more passes.
Hypothetical passer | Actual completion rate | Expected rate and CPOE |
A: 24 of 40 | 60% | 55%; plus 5 points |
B: 28 of 40 | 70% | 72%; minus 2 points |
Passer B completed four more throws than A. But relative to the model’s expectation for each passer’s own sample, B finished slightly below expectation while A finished above it. Neither calculation alone tells us who generated more yards, avoided more sacks or won the game. Those are separate questions.
What the expectation adds
NFL Next Gen Stats uses completion probability to account for throw difficulty. That distinction matters when a screen heavy passing plan is compared with an offense asking its quarterback to attempt more difficult throws. For the mechanics of depth, read Football Nation’s air yards guide. A high completion rate is still useful information; CPOE changes the question from how often the pass was completed to how that rate compared with the chosen expectation.
Do not treat every number labeled CPOE as interchangeable. Check which provider created the model, which attempts qualified, the season and games included, and whether the displayed value has been rounded. A missing model estimate is not automatically an expected incompletion. If you calculate your own average, retain only matched actual outcomes and valid expectations, and report the number of attempts.
The small sample trap
Return to the 40 attempt example. Change one incompletion to a completion while keeping the teaching probabilities fixed. Actual completion percentage rises from 60% to 62.5%, and CPOE rises from plus 5 to plus 7.5 percentage points. One play moved the result by 2.5 points. That is arithmetic, not evidence that a passer suddenly became a different player.
When combining games, weight the component values by their eligible attempts. A plus 10 point game on 10 attempts and a zero point game on 30 attempts produce plus 2.5 points across 40 attempts, not plus 5. Averaging the two game percentages equally would give the smaller outing too much influence. Rounding can create a small difference from a provider’s published figure.
Why this is not a fantasy ranking
Football Nation analysis: use CPOE as a reason to inspect performance, not as an automatic start or sit command. A passer can exceed completion expectations on a small passing workload and still offer less fantasy opportunity than a quarterback with more attempts or a larger rushing role. Conversely, a quarterback can generate useful fantasy production while completing fewer throws than expected.
Before moving a player in a fantasy lineup, ask about projected attempts, rushing involvement, touchdown opportunity, protection and receiver availability. Read the scoring settings in your own league. A format rewarding completions asks a different question from one emphasizing passing touchdowns or rushing yards. CPOE itself does not award those points.
The strongest counterargument
The strongest objection is that the model is not a substitute for watching the play. A completion outcome involves a receiver and a defense as well as a quarterback. A single number also does not tell you whether the quarterback chose the best available option. Football Nation’s answer is to preserve that limitation: use the statistic to frame a film question, then look for repeated evidence rather than assigning all credit or blame from the sign of CPOE.
A sensible next checkpoint is another meaningful sample with the same provider and eligibility rules. Check whether improvement survives a different opponent, whether the pass volume changed, and whether the quarterback’s decision making and available receivers explain the trend. A model change or a materially different supporting cast can change the comparison.
Quick questions
Does plus 5 CPOE mean five extra completions? No. It means five percentage points above expectation; the extra completion count depends on attempts. In the 40 attempt example, it means two.
Is negative CPOE an automatic bench signal? No. It is a performance flag to examine alongside role and matchup. Is CPOE the same as passer rating or EPA? No. Those measures answer different questions, so agreement is informative and disagreement is worth investigating.
Source ledger and next step
Sources checked at the times below. Definitions are attributed to the listed providers. Formulas, hypothetical examples, limitations and fantasy application are Football Nation authored analysis. No playing rule interpretation is asserted in this guide.
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