How is qb rating calculated

Passer rating is based on four metrics: completion percentage, yards per passing attempt, touchdown percentage, and interception percentage. Knowing those individual stats, though, is only the start.

In a Slate post, there was a step-by-step explainer, just in case you want to crunch the numbers yourself. Completion percentage: Subtract 30 from the percentage of passes that are thrown for completions, then multiply by. Yards per attempt: Subtract yards per passing attempt by three, then multiply by. Touchdown percentage: Multiply the percentage of touchdown passes per passing attempt by. Interception percentage: Multiply the percentage of interceptions per passing attempt by.

The scores for each category are added together. That sum is divided by six and multiplied by , which converts it into a rating on a scale from zero to The same four base metrics are considered, but slot into an alternate formula. This is not a joke: Matt Schaub's career passer rating of So, there's that. Not everyone, however, loves the stat. Similarly, some interceptions are simply due to bad luck.

Passing yards are the total number of yards thrown by a QB in a game. For the second formula, you take the number of passing yards and divide it by the number of attempts, subtract 3 and then multiply that number by. For the third formula, you take the number of passing touchdowns and divide it by the number of attempts again, this time simply multiply that number by For the last formula, take 2.

Finally, take the sum of Equation 1, Equation 2, Equation 3, and Equation 4 and divide that number by 6. Then, multiply that number times to calculate the QB's passer rating. Completion percentage in a game is the most important passer rating variable. This leads to quarterbacks who throw screens or other short passes will usually have a higher rating.

It also neglects major parts of a quarterback's performance like sacks , fumbles , and running statistics. However, what passer rating does reveal is that a game where a quarterback has over yards does not mean they will have a good rating. Passer rating is focused on what the quarterback was able to do with those throws with an emphasis on touchdowns and interceptions.