NFL Passer Rating Calculator

Calculate and understand the official formula used to calculate rating in nfl.

Chart visualizing the four components of the passer rating calculation.

What is the NFL Passer Rating Formula?

The formula use to calculate rating in nfl, officially known as passer rating, is a metric used to measure the performance of quarterbacks in American football. Adopted by the NFL in 1973, it combines four key statistics—completions, attempts, yards, touchdowns, and interceptions—into a single number. The scale ranges from a minimum of 0 to a maximum, or “perfect,” rating of 158.3. This calculator helps you instantly compute this value and understand the underlying components.

It’s important to note that this formula is designed to rate passers, not a quarterback’s total value, as it does not account for rushing ability, leadership, or other intangible qualities.

NFL Passer Rating Formula Explained

The passer rating calculation is a multi-step process. First, four separate components (named ‘a’, ‘b’, ‘c’, and ‘d’) are calculated. Each of these components is capped between a minimum of 0 and a maximum of 2.375 to ensure no single stat overly skews the result.

• Component ‘a’ (Completion Percentage): a = ((COMP / ATT) - 0.3) * 5
• Component ‘b’ (Yards per Attempt): b = ((YDS / ATT) - 3) * 0.25
• Component ‘c’ (Touchdown Percentage): c = (TD / ATT) * 20
• Component ‘d’ (Interception Percentage): d = 2.375 - ((INT / ATT) * 25)

After calculating and capping these four values, the final passer rating is determined with this formula:

Passer Rating = ((a + b + c + d) / 6) * 100

Variables Table

The core statistical inputs for the formula use to calculate rating in nfl.

Variable	Meaning	Unit	Typical Range
COMP	Completions	Count	0 – 45+ per game
ATT	Attempts	Count	1 – 60+ per game
YDS	Passing Yards	Yards	0 – 500+ per game
TD	Touchdowns	Count	0 – 7 per game
INT	Interceptions	Count	0 – 5+ per game

Practical Examples

Example 1: Elite Performance

Let’s say a quarterback has an excellent game with the following stats:

• Inputs: 30 COMP, 40 ATT, 380 YDS, 4 TD, 0 INT
• Calculation:
  • a = ((30/40) – 0.3) * 5 = 2.25
  • b = ((380/40) – 3) * 0.25 = 1.625
  • c = (4/40) * 20 = 2.0
  • d = 2.375 – ((0/40) * 25) = 2.375
• Result: ((2.25 + 1.625 + 2.0 + 2.375) / 6) * 100 = 137.5

Example 2: Average Performance

Now for a more average stat line:

• Inputs: 22 COMP, 38 ATT, 240 YDS, 1 TD, 1 INT
• Calculation:
  • a = ((22/38) – 0.3) * 5 = 1.395
  • b = ((240/38) – 3) * 0.25 = 0.829
  • c = (1/38) * 20 = 0.526
  • d = 2.375 – ((1/38) * 25) = 1.717
• Result: ((1.395 + 0.829 + 0.526 + 1.717) / 6) * 100 = 74.5

How to Use This Passer Rating Calculator

Using this calculator is straightforward. Follow these simple steps:

1. Enter Completions: Input the total number of successful passes.
2. Enter Attempts: Input the total number of pass attempts. This is a crucial denominator in the formula use to calculate rating in nfl.
3. Enter Passing Yards: Provide the total yards gained from passing.
4. Enter Touchdowns: Input the number of touchdown passes thrown.
5. Enter Interceptions: Input the number of interceptions thrown.
6. View Results: The calculator will update in real time, showing the final passer rating and the four intermediate components that make up the score.

Key Factors That Affect NFL Passer Rating

Several key performance indicators directly influence a quarterback’s rating. Understanding these is key to mastering the formula use to calculate rating in nfl.

• Completion Percentage: This is the most direct measure of accuracy. A higher percentage significantly boosts the ‘a’ component.
• Yards Per Attempt (YPA): This measures efficiency and aggressiveness. Throwing for more yards on fewer attempts increases the ‘b’ component.
• Touchdown Percentage: A quarterback’s ability to convert drives into scores is critical. A high TD-to-attempt ratio directly boosts the ‘c’ component.
• Interception Percentage: Ball security is paramount. A low interception rate is essential for a high ‘d’ component and a strong overall rating.
• Volume of Attempts: While not a direct factor in the rate-based formula, a higher number of attempts can stabilize the statistics, making them a more reliable indicator of skill over a larger sample size.
• Game Script: A team that is behind may pass more, potentially leading to more yards but also more mistakes, impacting the delicate balance of the formula’s components.

Frequently Asked Questions (FAQ)

1. What is a perfect passer rating?

A perfect passer rating is 158.3. It requires achieving the maximum value of 2.375 in all four components of the formula.

2. Can a passer rating be negative?

No. The formula is designed so that if any of the four components calculates to a negative number, it is floored at 0. Therefore, the lowest possible rating is 0.

3. What is the difference between Passer Rating and QBR?

Passer rating is an official NFL statistic based on a fixed formula. Total Quarterback Rating (QBR) is a proprietary metric created by ESPN that attempts to measure a quarterback’s total contributions, including rushing and sacks, on a scale of 0-100. The full QBR formula is not public.

4. Why is the maximum rating 158.3?

The number is a result of the formula’s structure. If a player achieves the maximum capped value of 2.375 for all four components, the final calculation is ((2.375 * 4) / 6) * 100 = 158.3.

5. Which component is the most important for a high rating?

All four components are weighted, but avoiding interceptions (the ‘d’ component) and having a high completion percentage (the ‘a’ component) are often seen as the foundation for a solid rating.

6. Is a higher number of attempts better?

Not necessarily for the rating itself, as it’s based on rates (per attempt). However, maintaining a high rating over a large number of attempts is the mark of a truly elite quarterback.

7. Does the formula account for rushing yards?

No, the official NFL passer rating formula strictly evaluates a player’s passing performance. Rushing stats are not included.

8. Has the formula ever changed?

The current formula was adopted in 1973 and has remained the standard for calculating the official NFL passer rating since then.