**This K/9 calculator is a vital tool in baseball analytics for measuring a pitcher’s strikeout efficiency using K/9 = (K / IP) × 9 formula. **

*K/9, short for “strikeouts per nine innings,” quantifies how many batters a pitcher would theoretically strike out if they pitched a complete game. *

For instance, imagine a pitcher who strikes out **6 batters** in **6 innings**. Their K/9 would be:

**(6 strikeouts / 6 innings) * 9 = 9 K/9**

This indicates the pitcher averages **9 strikeouts per nine-inning game**, a **solid performance** in most leagues.

## K per 9 Calculator

Strikeouts | Innings Pitched | K/9 | Interpretation |
---|---|---|---|

200 | 180 | 10.00 | Elite |

150 | 160 | 8.44 | Very Good |

120 | 150 | 7.20 | Average |

80 | 140 | 5.14 | Below Average |

220 | 200 | 9.90 | Very Good |

175 | 200 | 7.88 | Average |

90 | 110 | 7.36 | Average |

130 | 120 | 9.75 | Very Good |

50 | 90 | 5.00 | Below Average |

300 | 250 | 10.80 | Elite |

160 | 175 | 9.17 | Very Good |

140 | 160 | 7.88 | Average |

60 | 100 | 5.40 | Below Average |

## Strikeouts Per 9 Innings Formula

The formula for calculating K/9 is **straightforward**:

**K/9 = (Total Strikeouts / Innings Pitched) * 9**

**Where:**

**K**= Total number of strikeouts.**IP**= Total number of innings pitched.**K/9**= Strikeouts per 9 innings.

Consider a pitcher who has accumulated **120 strikeouts** over **150 innings**:

**K/9 = (120 / 150) * 9 = 0.8 * 9 = 7.2**

This pitcher averages **7.2 strikeouts per nine innings**, showcasing **above-average strikeout ability**.

## How To Calculate K per 9?

Calculating K/9 involves a **simple process**:

**Gather data**: Collect the pitcher’s total strikeouts and innings pitched.**Divide strikeouts by innings**: This gives you strikeouts per inning.**Multiply by 9**: Scale to a full game equivalent.

A pitcher has **85 strikeouts in 95 innings**.

**K/9 = (85 / 95) * 9 = 0.8947 * 9 ≈ 8.05**

This pitcher boasts an impressive **8.05 K/9**, indicating they’re quite adept at retiring batters via strikeout.

## What is a Good K per 9?

In modern Major League Baseball:

**Elite**:**10+ K/9****Very Good**:**8-10 K/9****Average**:**7-8 K/9****Below Average**:**<7 K/9**

For example, in **2023**, Gerrit Cole led the American League with an outstanding **11.53 K/9**, exemplifying elite strikeout prowess.

A high school pitcher with a **7 K/9** might be considered exceptional, while the same rate in the MLB would be average.

## Sources

- FanGraphs – K/9 (Strikeouts per Nine Innings)
- MLB.com – Statcast Leaderboard
- Baseball Reference – Standard Pitching Statistics

**Related Tools:**