I’ve never understood, i.e., never bothered to look up, the NFL’s Quarterback Rating. Today I finally understand it better. I gave Google Gemini this prompt:

“Help me understand what the NFL’s Quarterback Rating is and how it’s calculated.”

Here’s the response:

The NFL's Quarterback Rating is a formula that attempts to measure a quarterback's overall performance in a game. It's calculated using four factors: 1. Completion Percentage: This measures how often the quarterback completes his passes. A higher completion percentage is better. 2. Average Yards per Attempt (AYPA): This measures how many yards the quarterback gains on average per pass attempt. A higher AYPA is better. 3. Percentage of Touchdown Passes: This measures how often the quarterback throws touchdowns. A higher percentage is better. 4. Interception Percentage: This measures how often the quarterback throws interceptions. A lower percentage is better. Each of these four factors is given a score between 0 and 2.15. The scores for each factor are then averaged together and multiplied by 100 to get the final Quarterback Rating. It's important to note that the Quarterback Rating is just one way to evaluate a quarterback's performance. It doesn't take into account factors like rushing yards or fumbles, which can also be important for a quarterback's overall impact on the game.

Then I had to look up the highest-rated QBs to get some perspective.

Now I know.