# Bases on balls per 9 innings pitched

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.

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