防御率计算器

使用此防御率计算器快速获得准确的计算结果。

Earned Runs

投球局数

ERA

2.70

Earned Runs per Inning0.300

Earned Runs per 9 Innings2.7

投球局数100.0

ERA vs Earned Runs

公式

ERA = (Earned Runs / Innings Pitched) x 9

ERA normalizes to a 9-inning game so you can compare pitchers with different workloads.

Below 3.00: Excellent (ace-level)

3.00-3.50: Very good

3.50-4.00: Above average

4.00-4.50: Average

Above 5.00: Below average

A pitcher allowed 30 earned runs in 100 innings.

What is the difference between earned and unearned runs?

Earned runs are scored without the benefit of an error or passed ball. Unearned runs result from defensive mistakes and do not count in ERA.

What is a good ERA?

In modern baseball, an ERA below 3.50 is very good for starters. Relief pitchers often have lower ERAs due to shorter appearances.

How do thirds of innings work?

In baseball notation, 6.1 innings means 6 and one-third innings. For ERA calculation, use 6.333. Similarly, 6.2 = 6.667.

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