NFL Passer Rating Calculator
Calculate a quarterback’s official NFL passer rating using the standard formula
Passer Rating Results
Perfect rating is 158.3. League average is typically around 90.0.
Complete Guide to Calculating NFL Passer Rating
The NFL passer rating (officially called the “passer efficiency rating”) is the standard metric used to evaluate quarterback performance in the National Football League. This comprehensive guide explains how the rating is calculated, its historical context, and how to interpret the results.
The NFL Passer Rating Formula
The passer rating formula was developed in 1973 and uses four key passing statistics:
- Completion percentage
- Yards per attempt
- Touchdowns per attempt
- Interceptions per attempt
The formula is:
Passer Rating = ( ( (Comp/Att - 0.3) * 5 ) + ( (Yards/Att - 3) * 0.25 ) + ( (TD/Att) * 20 ) + ( 2.375 - (INT/Att * 25) ) ) / 6 * 100
Each component is scaled to a maximum value of 2.375 (which would produce a perfect 158.3 rating) and minimum value of 0.
Understanding the Components
| Component | Maximum Value | Minimum Value | Weight in Formula |
|---|---|---|---|
| Completion % | 77.5% | 30.0% | 5 |
| Yards per Attempt | 12.5 | 3.0 | 0.25 |
| TDs per Attempt | 11.875% | 0% | 20 |
| INTs per Attempt | 0% | 9.5% | 25 |
Historical Context and Evolution
The passer rating system was introduced in 1973 to provide a standardized way to compare quarterback performance across different eras. Before this, evaluation was largely subjective or based on raw statistics without context.
Key milestones in passer rating history:
- 1973: Formula introduced with maximum possible rating of 158.3
- 1980s: Dan Marino becomes first QB to exceed 100 rating in a season (108.9 in 1984)
- 2004: Peyton Manning sets single-season record (121.1)
- 2011: Aaron Rodgers breaks record (122.5)
- 2020: Patrick Mahomes becomes first QB with multiple 120+ rating seasons
How to Interpret Passer Ratings
| Rating Range | Interpretation | Example QBs (Career) |
|---|---|---|
| 110.0+ | Elite (MVP-caliber season) | Patrick Mahomes, Aaron Rodgers |
| 95.0-109.9 | Pro Bowl level | Tom Brady, Drew Brees |
| 85.0-94.9 | Above average starter | Matthew Stafford, Kirk Cousins |
| 75.0-84.9 | Average starter | Derek Carr, Ryan Tannehill |
| Below 75.0 | Below average/backup level | Most rookie QBs |
Limitations of Passer Rating
While passer rating is the official NFL metric, it has several limitations:
- No rushing contribution: Doesn’t account for QB rushing yards or TDs
- No sack consideration: Sacks are counted as passing attempts but not in the formula
- No game situation context: Treats all passes equally regardless of down/distance
- No strength of opponent: Doesn’t adjust for quality of defense faced
- No clutch performance: Doesn’t weight game-winning drives more heavily
For these reasons, many analysts prefer more advanced metrics like ESPN’s Total QBR or Pro Football Focus grades which attempt to address these limitations.
How Passer Rating Compares to Other Metrics
The NFL has experimented with alternative metrics over the years:
- Adjusted Net Yards per Attempt (ANY/A): Includes sacks and adjusts for TDs/INTs
- Quarterback Rating (QBR): ESPN’s proprietary metric (0-100 scale) that accounts for all plays
- Expected Points Added (EPA): Measures how much a QB’s plays increase their team’s expected points
- Completion Percentage Over Expectation (CPOE): Uses Next Gen Stats to evaluate accuracy
For official NFL records and historical comparisons, however, passer rating remains the standard metric.
Frequently Asked Questions
What’s the highest possible passer rating?
The maximum possible rating is 158.3, achieved by meeting all maximum component values in a single game or season.
Has any QB achieved a perfect 158.3 rating?
Yes, 73 players have achieved a perfect 158.3 passer rating in a single game (minimum 10 attempts). The most recent was Tua Tagovailoa in 2022.
What’s considered a good passer rating?
A rating above 100 is considered excellent, 90-99 is very good, 80-89 is above average, and 70-79 is about league average.
How does the college passer rating differ?
The NCAA uses a different formula that produces higher maximum ratings (typically in the 170s-180s range) and different component weights.
Authoritative Resources
For official information about NFL passer rating calculations:
- NFL’s Official Passer Rating Formula
- Pro Football Hall of Fame: QB Evolution
- Sports Reference: Rating Systems Comparison
Advanced Applications
For statisticians and analysts, passer rating can be used in several advanced ways:
- Adjusted Passer Rating: Normalizing for era by comparing to league average
- Situational Rating: Calculating separate ratings for 3rd down, red zone, etc.
- Opponent-Adjusted Rating: Weighting by strength of defense faced
- Win Probability Added: Combining with game situation data
These advanced applications help provide more context to the raw passer rating numbers.
Conclusion
The NFL passer rating remains the most widely recognized metric for evaluating quarterback performance, despite its limitations. Understanding how it’s calculated helps fans better appreciate quarterback play and makes watching NFL games even more enjoyable.
For the most accurate evaluation, consider using passer rating in combination with other advanced metrics and qualitative analysis of a quarterback’s decision-making and leadership.