Block Percentage is an estimate of the percentage of opponent two-point field goal attempts that a player blocks while they are on the court. It measures rim and interior shot deterrence relative to how many two-point shots the opponent actually put up during that player's minutes.
This is the most position-skewed of the defensive rate stats: centers block shots at more than 3x the rate of guards. Minutes-weighted averages, 2025-26 season, min. 20 GP.
Top 5 in the NBA this season, min. 20 games played.
BLK% varies a lot by position. Minutes-weighted averages this season: C 3.84%, PF 2.23%, SF 1.52%, SG 1.16%, PG 1.09%. Anything above the average for a player's own position is a reasonable bar for good.
Most shots come from inside the paint, and those are the ones that are actually blockable, compared to jump shots further out. Centers spend most of their time defending exactly that area of the floor.
No, same limitations as STL%. There are a lot of factors that go into good rim defense, and biting hard for a block attempt can inflate BLK% while also making a player easier to score around.