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Baseball Strikeout Rate (K/9) Calculator

Calculate a pitcher's strikeout rate (K/9) from strikeouts and innings pitched. See how many strikeouts they average per 9 innings, shown to two decimals.

Input

K
IP

Example: 6 2/3 innings is entered as 6.2 (a first decimal of 1 or 2 counts as 1/3 or 2/3 of an inning, i.e. outs).

Result

Strikeout rate (K/9)

10.50

Strikeouts

7 K

Innings pitched

6 IP

Note

Strikeouts per 9 innings

How it works

  • Strikeout rate (K/9) is found with "strikeouts x 9 / innings pitched" and shows how many strikeouts a pitcher averages per 9 innings.
  • A higher value means a greater ability to miss bats, making it a handy way to compare the dominance of both starters and relievers.
  • Following baseball convention, innings pitched treat a ".1" as 1/3 of an inning (one out) and a ".2" as 2/3 of an inning (two outs). Enter 6 2/3 innings as "6.2".
  • The result is shown to two decimal places. Over small samples the figure can swing widely, so comparing across a reasonable number of appearances is recommended.
  • You can enter any range, from a full season to a single game or the last few outings, which helps track changes in form or role.