Offensive and defensive rating explained
Offensive and defensive rating in one sentence, why measuring per possession matters, how net rating ties to winning, and how to read these numbers for teams and players.
The idea in one sentence
Offensive rating measures how many points a team scores per one hundred possessions, and defensive rating how many it allows per one hundred possessions. By counting per possession rather than per game, these numbers describe how efficiently a team plays, independent of whether it prefers a fast or a slow tempo. They are among the cleanest measures of how good a team really is at each end of the floor.
Why per possession matters
Raw points per game are misleading because teams control how many possessions a game contains. A fast-paced team will score and concede more simply because it plays quicker, while a slow team's lower totals can hide real efficiency. Rating per one hundred possessions strips tempo out of the equation, so a run-and-gun team and a grind-it-out team can be compared on equal terms. It answers what a team does with each chance, not how many chances it manufactures.
Net rating and winning
Subtract a team's defensive rating from its offensive rating and you get its net rating, the points it outscores opponents by per one hundred possessions. This single number tracks team quality closely: champions tend to post strongly positive net ratings, while the weakest teams run deeply negative. Because it captures both ends at once and removes pace, net rating is one of the most reliable quick summaries of how good a team is over a stretch of games.
How to read it for players
The same ratings are calculated for individuals, based on how the team performs while a player is on the court. These are revealing but must be handled with care, because a player's on-court numbers are shaped by teammates and opponents as much as by the player. On and off comparisons — how the team does with a player versus without — add useful context, but a small sample or a strong supporting cast can distort an individual reading.
Where you will see it
Offensive, defensive and net ratings are staples of modern basketball analysis, used to rank teams, judge line-ups and evaluate coaches. They pair naturally with the four factors, which explain why a rating is high or low. When a forecast weighs one team against another, pace-adjusted ratings are often at the heart of the estimate, because they measure quality in a way that raw scoring totals simply cannot.