"Offensive Rating" is a statistic used in basketball to measure either a team's offensive performance or an individual player's efficiency at producing points for the offense. It was created by author and statistician Dean Oliver.
For teams, the formula is: 100 x Pts / (Tm FGA + .40 x Tm FTA - 1.07 x (Tm ORB / (Tm ORB + Tm DRB)) x (Tm FGA - Tm FG) + Tm TO)
For players, the formula is: Offensive Rating = (Points Produced / Individual Possessions) x 100
Points can be produced through field goals, free throws, assists, and offensive rebounds. Individual possessions are the sum of a player's scoring possessions (field goals, free throws, plus partial credit for assists), missed field goals and free throws that the defense rebounds, and turnovers.