A team's ability to increase its number of possessions, gives it a greater chance to score points and win games. Offensive rebounding is the main factor for a team to gain possessions.
This is measured by offensive rebounding percentage or the percentage of offensive rebounds a team grabs over the course of a game or season.
OR% = Offensive Rebounds / (Offensive Rebounds + Opponent's Defensive Rebounds)
For example, over the entire 2016-2017 season North Carolina's Offensive Rebounding Percentage was 41%.
The Tar Heels grabbed 630 offensive rebounds to their opponents 890 defensive rebounds.
OR% = 630 / (630 + 890) = 0.414 * 100
This means on a North Carolina missed shot or free throw, the team rebounded the ball 41% of the time.
Similar to how a team forces turnovers, defensive rebounding can limit a team's chance to earn more possessions.
For example, Purdue posted a defensive rebounding rate of 24%. The Boilermakers pulled down 975 defensive rebounds and its opponents snagged 315 offensive rebounds.
Opponents' OR% = 315 / (315 + 975) = .244 * 100)
This means Purdue's opponents only grabbed an offensive rebound on 24% of its misses.
A team's ability to shoot or make shots also impacts offensive rebounding percentage.
For example, in the 2017 NCAA Second Round, Michigan grabbed 6 offensive rebounds. Oklahoma State snagged 24 defensive rebounds.
Michigan's OR% was 20%.
OR% = 6 / (6 +24) = .20 * 100
Michigan made 52% of their shots explaining their low percentage of offensive rebounds.
Rebounds are measured differently across all of college basketball. KenPom and other analytics sites compute percentages that don't include team rebounds.
Team rebounds are totaled by specific schools and other entities. This means there can be a slight difference between rebounding totals depending on the source of the box score or statistics.
What is a team rebound?
If a team misses a shot, a rebound is recorded. Not every missed shot falls into the possession of an individual player.
For example, a missed shot can go out of bounds. In this situation, a team rebound is given to the team that was defending the missed shot.
This is common if a team shoots an airball, a missed shot goes over the backboard, or 2 or more players from the same team gain possession of the ball.