Bases on balls per 9 innings pitched
|This article does not cite any references or sources. (December 2009)|
In baseball statistics, bases on balls per 9 innings pitched (BB/9IP or BB/9) or walks per nine innings (denoted by W/9) is the average number of bases on balls, (or walks) given up by a pitcher per nine innings pitched. It is determined by multiplying the number of bases on balls allowed by nine and dividing by the number of innings pitched. It is a measure of the bases on balls ability of a pitcher.
|This baseball-related article is a stub. You can help Wikipedia by expanding it.|