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League Parity Index
The NBA drifted slightly less balanced across three seasons: the win-share Gini rose from 0.177 in 2023-24 to 0.2004 in 2025-26.
confirmednull (a finding)not testabledescriptivepending
League Parity Index
What it means
Even at the top of that range the league is very balanced (0 is perfectly even), so the shift is small. Roughly a quarter of games are decided by 5 points or fewer, edging up from 23.3% to 25.5%, and the average absolute final margin sits around 12.6 to 13.0 points.
Caveats & confounds
NOT a forecast of any future season; NOT strength-of-schedule adjusted (opponent-raw win counts); pooled with any playoff games in the parquet, which inflate win concentration. The 2024-25 and 2025-26 rows are flagged as looking partial versus a full 1230-game season.
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