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HR/9 Formula:
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HR/9 (Home Runs per 9 innings) is a baseball statistic that measures how many home runs a pitcher allows per nine innings pitched. It's an important metric for evaluating a pitcher's ability to prevent home runs.
The calculator uses the HR/9 formula:
Where:
Explanation: The formula normalizes home run rate to a standard 9-inning game, allowing for comparison between pitchers regardless of innings pitched.
Details: HR/9 is a valuable metric for evaluating pitcher performance, especially in today's home run-heavy environment. A lower HR/9 indicates better ability to prevent home runs, which is crucial for preventing big innings and maintaining low ERAs.
Tips: Enter the total number of home runs allowed and total innings pitched. Innings can be entered with decimal values (e.g., 6.2 for 6⅔ innings). Both values must be positive numbers, with innings greater than zero.
Q1: What is considered a good HR/9 ratio?
A: Generally, a HR/9 below 1.0 is considered excellent, between 1.0-1.5 is average, and above 1.5 is below average. However, these benchmarks can vary by era and ballpark.
Q2: How does HR/9 compare to other pitching metrics?
A: HR/9 complements metrics like ERA, FIP, and WHIP by specifically measuring a pitcher's vulnerability to home runs, which are often game-changing events.
Q3: Is HR/9 predictive of future performance?
A: While HR/9 has some predictive value, it can be influenced by factors like ballpark dimensions and luck. It's often used in conjunction with other metrics for player evaluation.
Q4: Can HR/9 be calculated for relievers?
A: Yes, HR/9 is useful for both starters and relievers, though sample size considerations are more important for relievers who pitch fewer innings.
Q5: How has the league average HR/9 changed over time?
A: League average HR/9 has fluctuated throughout baseball history, generally increasing during "live ball" eras and decreasing during "dead ball" eras or in pitcher-friendly ballparks.