This is for a single game. To calculate season passer rating, just add their passer ratings from each game they played and divide it by how many games they played that season. To calculate career passer rating, just calculate season passer rating for all seasons they played at least one game and divide it by how many seasons they played at least one game.
Nathan Peterman, 2018 (0.0) (picture from 2019, ESPN) Lamar Jackson, 2019 (158.3) (picture from 2019, NFL) Just round to the nearest 0.1. For the best passer rating, throw 25 completions, 31 pass attempts, 429 passing yards, and 5 touchdowns (no INTs). For the worst passer rating, throw 5 completions, 18 pass attempts, 24 passing yards and 2 interceptions (no TDs).
