Take how many earn runs they have multiply it by 9 then divide by how many innings they've pitched
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For the stat "Strikeouts per 9 Innings" for pitchers that have pitched at least 1000 innings the all time leader, through games played on September 22, 2009 is Randy Johnson with 10.61 strikeouts per 9 innings pitched (4872 strikeouts in 4132 1/3 innings pitched).Second all time is Kerry Wood with 10.39 strikeouts per 9 innings pitched (1466 strikeouts in 1270 1/3 innings pitched) and third is Pedro Martinez with 10.05 strikeouts per 9 innings pitched (3152 strikeouts in 2823 1/3 innings pitched).
ERA is the abbreviation for Earned Run Average. ERA is calculated on a per-9-inning basis, so if you give up 2 earned runs in 3 innings, then your ERA is 6.00.
WHIP is a new statistic for pitchers and it means Walks plus Hits per Inning Pitched. You add up the number of hits allowed and add to the number of walks allowed and divide by innings pitched. If a pitcher has walked 50 batters and given up 150 hits and pitched 180 innings, the WHIP would be calculated as (50 + 150) / 180 which equals 1.11.
3 outs per inning 9 innings per game
Not sure all the arguments for and against this but it was done here and for this reason. I would guess a time factor was involved. March 7, 1857 Event: Baseball decides 9 innings constitutes an official game, not 9 runs