How is qbr calculated
In the world of American football, the quarterback is considered the most important player on the field. Their ability to assess the game and adapt their team’s strategy is a crucial factor that can make or break a team’s performance. One metric designed to measure a quarterback’s on-field performance is the Quarterback Rating (QBR). This article will discuss how QBR is calculated and its importance in evaluating a quarterback’s effectiveness.
1. Understanding the components of QBR
QBR, commonly referred to as passer rating, measures a quarterback’s passing efficiency based on four key components: completion percentage, yards per attempt, touchdown percentage, and interception percentage. To calculate QBR, each of these components is weighed and assigned a value on a scale between 0 and 2.375.
2. QBR calculation formula
The formula for calculating QBR can be broken down into five steps:
Step 1: Calculate completion percentage
Completion Percentage = (Completed Passes/Pass Attempts) x 100
Step 2: Compute adjustment factors for each component
a) Completion Percentage Adjustment = ((Completion Percentage – 30) / 20)
b) Yards per Attempt Adjustment = ((Yards Per Attempt – 3) / 4)
c) Touchdown Percentage Adjustment = (Touchdowns / Pass Attempts) x 20
d) Interception Percentage Adjustment = (2.375 – ((Interceptions / Pass Attempts) x 25))
Step 3: Ensure adjustment values are within range
Each adjustment factor must be constrained within the range of 0 and 2.375.
Step 4: Calculate the sum of all adjustments
Sum = Completion Percentage Adjustment + Yards per Attempt Adjustment + Touchdown Percentage Adjustment + Interception Percentage Adjustment
Step 5: Determine the final QBR value
QBR = (Sum / 6) x 100
3. The importance of understanding QBR
QBR is an essential tool for evaluating a quarterback’s efficiency and effectiveness on the field. While it does not account for other critical aspects of their game, such as rushing abilities or decision-making under pressure, it does offer valuable insight into their performance as a passer.
By understanding how QBR is calculated, analysts, coaches, and fans can have a better grasp of a quarterback’s strengths and weaknesses, allowing them to construct more informed strategies and game plans.
In conclusion, the QBR calculation measures a quarterback’s passing efficiency based on four essential components: completion percentage, yards per attempt, touchdown percentage, and interception percentage. By breaking down the components and following the step-by-step formula provided above, one can accurately analyze a quarterback’s performance over time. Though not without limitations, QBR serves as an invaluable tool for evaluating a quarterback’s on-field effectiveness as a passer and contributes to designing more strategic game plans.