ERA Calculator

Find a pitcher's earned run average.

ERA 3

Formula: ERA = earned runs × 9 ÷ innings pitched

Step-by-step with your numbers:

1. Values used:

2. Earned runs = 30

3. Innings pitched = 90

5. ERA = Innings pitched / Earned runs = 90 / 30 = 3

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ERA measures earned runs allowed per nine innings.

The math behind it

ERA = earned runs × 9 ÷ innings pitched.

30 ER over 90 innings → 3.00.

Good ERA?

Under 3.00 is excellent; around 4.00 is league-average.