H/9
Hits allowed per 9 innings.
What H/9 means
Rate version of hits allowed. Moves with BABIP and the defense behind the pitcher, so treat sharp year-to-year swings as noise unless contact quality moved too.
How H/9 is calculated
H/9 = H × 9 / IP
What counts as a good H/9
Lower is better — roughly 9.5 is poor, 8.5 average, 7.5 good, and 6.5 or better elite.
Also written
hits_per_9 · h_per_9 · hits_per_9_inn