Strikeout efficiency can be measured in several ways. There is ongoing debate about which measurement is most useful and correlates best with other statistics, so you may find it useful to calculate a pitcher's efficiency in several ways and then decide for yourself which statistic is most accurate. The most common statistics for measuring strikeout efficiency are K/IP (strikeouts per inning pitched), K/9 (strikeouts per nine innings), K/BF (strikeouts per batter faced), K/#PIT (strikeouts per number of pitches thrown) and K/100 (strikeouts per 100 pitches thrown).
K/IP and K/9
Step 1
Add up the number of strikeouts a pitcher has over any given time period.
Step 2
Divide the number from Step 1 by the number of innings the pitcher pitched over the same time period. Don't forget to include partial innings as well, represented as fractions (either 1/3 or 2/3). The resulting figure is K/IP, or strikeouts per innings pitched, a way of calculating strikeout efficiency.
Step 3
Multiply the result from Step 2 by 9. The resulting figure is the pitcher's K/9, or strikeouts per nine innings pitched.
K/BF
Step 1
Calculate the number of strikeouts thrown by the pitcher in a given time period.
Step 2
Add up the number of batters faced over the same time period.
Step 3
Divide the number of strikeouts thrown by the number of batters faced. The result is K/BF, or strikeouts per batter faced.
K/#PIT and K/100
Step 1
Count up the number of strikeouts thrown by the pitcher in question during a certain time period.
Step 2
Divide the number from Step 1 by the total number of pitches thrown. This number is usually a decimal less than .10. Since the idea that a pitcher has struck out less than .10 of a batter per pitch can be confusing, continue on to Step 3 to figure K/100, a more manageable statistic.
Step 3
Multiply the result from Step 2 by 100. So if your result from Step 2 was .0546, multiplying it by 100 gives 5.46 batters struck out per 100 pitches thrown.
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