How is QB Rating Calculated?
Calculate the official NFL Passer Rating using the standard four-component formula.
Component Breakdown
Each component is capped between 0 and 2.375
Visual representation of the four weighted factors.
| Component | Raw Value | Weighted Score (0 – 2.375) |
|---|
What is How is QB Rating Calculated?
Understanding how is qb rating calculated is essential for any serious football fan or analyst. The NFL Passer Rating is a standardized formula used to evaluate the efficiency of quarterbacks. Unlike total passing yards or touchdowns, which can be inflated by high volume, the passer rating focuses on per-attempt efficiency.
Who should use it? Coaches, scouts, and fantasy football enthusiasts use this metric to compare players across different eras and teams. A common misconception is that the passer rating is the same as "QBR" (Total Quarterback Rating). While passer rating is a fixed mathematical formula based solely on box score stats, ESPN's QBR is a proprietary metric that includes rushing and situational context.
How is QB Rating Calculated: Formula and Mathematical Explanation
The calculation involves four distinct steps, each measuring a different aspect of passing performance. Each component is capped at a maximum of 2.375 and a minimum of 0 to prevent a single outlier stat from skewing the entire rating.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| ATT | Pass Attempts | Count | 20 – 45 per game |
| COMP | Completions | Count | 60% – 70% of ATT |
| YDS | Passing Yards | Yards | 6.5 – 8.5 per ATT |
| TD | Touchdowns | Count | 3% – 7% of ATT |
| INT | Interceptions | Count | 1% – 3% of ATT |
The Step-by-Step Derivation
To understand how is qb rating calculated, you must calculate these four components:
- Component A (Completion %): ((Completions / Attempts) – 0.3) × 5
- Component B (Yards per Attempt): ((Yards / Attempts) – 3) × 0.25
- Component C (Touchdowns per Attempt): (Touchdowns / Attempts) × 20
- Component D (Interceptions per Attempt): 2.375 – ((Interceptions / Attempts) × 25)
Finally, the rating is found by: [(A + B + C + D) / 6] × 100.
Practical Examples (Real-World Use Cases)
Example 1: A Standard Good Game
Imagine a QB goes 20 for 30, 250 yards, 2 TDs, and 0 INTs.
Using the how is qb rating calculated logic: Comp% is 66.7%, YPA is 8.33, TD% is 6.7%, and INT% is 0%.
The resulting rating is 114.6, which is considered an elite performance.
Example 2: The Perfect Game (158.3)
To achieve a perfect rating, a quarterback must hit the 2.375 cap in all four categories. This requires at least a 77.5% completion rate, 12.5 yards per attempt, an 11.875% touchdown rate, and zero interceptions. This is the ultimate benchmark in how is qb rating calculated.
How to Use This QB Rating Calculator
Using our tool to find out how is qb rating calculated is simple:
- Enter the total Pass Attempts from the game or season.
- Input the number of Completions.
- Enter the total Passing Yards.
- Input the number of Touchdowns and Interceptions.
- The calculator updates in real-time, showing you the final rating and the breakdown of the four components.
Key Factors That Affect QB Rating Results
Several factors influence the outcome when how is qb rating calculated is applied:
- Completion Accuracy: Since the formula subtracts 0.3 (30%), any completion rate below 30% results in a zero for that component.
- Big Play Ability: Yards per attempt heavily rewards quarterbacks who throw downfield rather than just checking down.
- Ball Security: Interceptions are heavily penalized. A single pick can drop a rating by 10-15 points.
- Red Zone Efficiency: High touchdown ratios are the fastest way to boost a rating toward the 158.3 ceiling.
- Volume vs. Efficiency: The formula does not care if you throw 10 passes or 100; it only cares about the percentages.
- The 2.375 Cap: This prevents "infinite" ratings. Even if a QB averages 50 yards per catch, they only get 2.375 points for the yardage component.
Frequently Asked Questions (FAQ)
What is the highest possible QB rating?
The maximum possible NFL passer rating is 158.3. This occurs when a player reaches the 2.375 cap in all four calculation categories.
What is considered a "good" passer rating?
In the modern NFL, a rating above 90 is considered solid, while 100+ is elite. Historically, ratings were lower due to different defensive rules.
Does rushing yardage count in the QB rating?
No. When how is qb rating calculated, only passing statistics are used. Rushing yards and rushing TDs are ignored.
Why is the formula divided by 6?
The division by 6 and multiplication by 100 was designed by the NFL in 1973 to create a scale where 100 was an exceptional season at that time.
Can a QB rating be zero?
Yes. If a quarterback performs poorly enough in all four categories (e.g., many interceptions, no TDs, low completion %), the rating will be 0.0.
How does this differ from College Passer Rating?
The NCAA uses a different formula that is not capped at 158.3. College ratings can often exceed 200.
Do sacks affect the passer rating?
No, sacks are not included in the standard NFL passer rating formula, though they do affect "Adjusted Yards per Attempt."
Is passer rating a good measure of talent?
It is a great measure of efficiency, but it doesn't account for leadership, rushing ability, or performance under pressure.
Related Tools and Internal Resources
- NFL Passing Records Guide – Explore the all-time leaders in passer rating.
- Quarterback Efficiency Metrics – A deep dive into advanced stats beyond the box score.
- Advanced NFL Stats – Learn about EPA, CPOE, and other modern metrics.
- Passer Rating History – How the league average has changed since 1973.
- QBR vs. Passer Rating – Understanding the difference between the two major metrics.
- NFL Stat Calculators – Our full suite of football performance tools.