Home
Back
BB/9 Formula:
| From: | To: |
BB/9 (walks per 9 innings) is a baseball statistic that measures how many walks a pitcher allows per nine innings pitched. It's an important metric for evaluating a pitcher's control and command.
The calculator uses the BB/9 formula:
Where:
Explanation: The formula normalizes walk totals to a standard 9-inning game, allowing for fair comparison between pitchers regardless of innings pitched.
Details: BB/9 is a crucial metric for evaluating pitcher performance. Lower BB/9 values indicate better control and command, while higher values suggest control issues. It's particularly important for scouts, coaches, and fantasy baseball players when evaluating pitcher talent and potential.
Tips: Enter the total number of walks allowed (BB) and total innings pitched (IP). Both values must be positive numbers, with IP greater than 0.
Q1: What is considered a good BB/9 value?
A: Generally, a BB/9 below 3.0 is considered good, below 2.5 is excellent, and below 2.0 is elite. Values above 4.0 typically indicate control problems.
Q2: How does BB/9 differ from walk percentage (BB%)?
A: BB/9 measures walks per 9 innings, while BB% measures walks as a percentage of total batters faced. Both are useful but provide slightly different perspectives on control.
Q3: Can BB/9 be used to predict future performance?
A: Yes, BB/9 is considered one of the more stable pitching metrics and is often used to predict future performance, especially when combined with other metrics like strikeout rate.
Q4: Does ballpark factor affect BB/9?
A: Unlike some pitching statistics, BB/9 is generally not significantly affected by ballpark factors since walks are primarily determined by pitcher control rather than field dimensions.
Q5: How has the average BB/9 changed over time in MLB?
A: BB/9 has fluctuated throughout baseball history, with generally lower values in recent years as teams place more emphasis on pitcher control and command.