Home runs per nine innings

In baseball statistics, home runs allowed per 9 innings pitched (HR/9IP or HR/9) or home runs allowed per nine innings (denoted by HR/9) is the average number of home runs given up by a pitcher per nine innings pitched. It is determined by multiplying the number of home runs allowed by nine and dividing by the number of innings pitched.

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Baseball statistics
Batting	Batting average On-base percentage Slugging percentage Hit Single Double Triple Home run Extra-base hit Grand slam Total bases RBI Game-winning RBI Walk Bunt Sacrifice bunt Sacrifice fly On-base plus slugging Times on base Walk-to-strikeout ratio Walk percentage
Base running	Run Stolen base Stolen base percentage Caught stealing
Pitching	Win–loss record Innings pitched Pitchers of record Save Hold Run Earned ERA Strikeout Walk Perfect game No-hitter WHIP BB/9 K/9 Quality start Complete game Shutout Wild pitch Strikeout-to-walk ratio
Fielding	Fielding percentage Assist Putout Error Fielder's choice Defensive indifference Passed ball
Sabermetrics	Adjusted ERA+ Base runs Batting average on balls in play Batting park factor Catcher's ERA Defensive Runs Saved Extrapolated Runs Game score Isolated Power Range factor Runs created Runs produced Secondary average Speed Score NERD Out of zone plays made Ultimate zone rating Value over replacement player Weighted on-base average Wins Above Replacement Win probability added Win Shares