ERA Calculator (Earned Run Average)

Calculate a pitcher's Earned Run Average (ERA) - the standard metric for evaluating pitcher performance in baseball. Also calculates WHIP, FIP, and other advanced stats.

Earned Runs (ER)

Runs scored without fielding errors

Innings Pitched (IP)

Use decimal format: 100.1 = 100⅓ innings

Hits Allowed (H)

Walks (BB)

Strikeouts (K)

Home Runs (HR)

Standard Pitching Stats

ERA:	-
WHIP:	-
FIP:	-
K/9:	-
BB/9:	-
K/BB Ratio:	-

Performance Rating

Summary

Total Innings:	-
Total Outs:	-
Batters Faced:	-

Step-by-Step Calculation

Enter earned runs and innings pitched, then click "Calculate ERA" to see the step-by-step calculation.

ERA Formula

ERA = (Earned Runs × 9) ÷ Innings Pitched

Example: 45 ER × 9 = 405 ÷ 100 IP = 4.05 ERA

ERA represents the average number of earned runs a pitcher would allow over 9 innings.

What is a Good ERA?

Sub-3.00: Elite (Ace level)
3.00-3.50: Excellent
3.50-4.00: Above Average
4.00-4.50: League Average
4.50-5.00: Below Average
5.00+: Poor

Advanced Stats Explained

WHIP: (Walks + Hits) / IP - Measures baserunners allowed
FIP: Fielding Independent Pitching - ERA based on K, BB, HR
K/9: Strikeouts per 9 innings
BB/9: Walks per 9 innings
K/BB Ratio: Strikeout to walk ratio