GmSc

“Game Score” (GmSc) is a metric developed by basketball statistician John Hollinger. It is an extension of Player Efficiency Rating (as well as a simpler alternative).

The intention is to give a “total value” on a player’s statistical performance in a basketball game. It takes every statistic listed on a player’s box score into account. Where most players are judged only on scoring ability, Game Score includes other contributions such as rebounds, steals, blocks, turnovers, and other actions.

Game Score is intended for use in a single game. It represents a parallel number, but an alternative to points scored. 40 is a fantastic game score, and ten an average performance.

Formula:

Game Score = Points Scored + (0.4 x Field Goals) – (0.7 x Field Goal Attempts) – (0.4 x (Free Throw Attempts – Free Throws)) + (0.7 x Offensive Rebounds) + (0.3 x Defensive Rebounds) + Steals + (0.7 x Assists) + (0.7 x Blocks) – (0.4 x Personal Fouls) – Turnovers

Example:

In a game, a player has made: 26 points, 6 field goals, 21 field goal attempts, 14 free throws, 21 free throw attempts, 1 offensive rebound, 4 defensive rebounds, 1 steal, 10 assists, 1 block, 1 personal foul, and 7 turnovers.

Game Score (GmSc) = 26 + (0.4 x 6) – (0.7 x 21) – (0.4 x (21 – 14)) + (0.7 x 1) + (0.3 x 4) + 1 + (0.7 x 10) + (0.7 x 1) – (0.4 x 1) – 7

Game Score (GmSc) = 26 + 2.4 – 14.7 – (0.4 x 7) + 0.7 + 1.2 + 1 + 7 + 0.7 – 0.4 – 7

Game Score (GmSc) = 26 + 2.4 – 14.7 – 2.8 + 0.7 + 1.2 + 1 + 7 + 0.7 – 0.4 – 7

Game Score (GmSc) = 14.1

Therefore, this player has a game score of 14.1.