ERA Calculator

Calculate Earned Run Average (ERA) for baseball pitchers instantly. Enter earned runs and innings pitched to get ERA with performance ratings. Pure client-side.

Earned Runs Allowed

Innings Pitched (full)

Additional Outs (0-2) Enter 0, 1, or 2 for partial innings

About ERA Calculator

Earned Run Average (ERA) is the most widely used statistic for evaluating pitchers in baseball and softball. It represents the average number of earned runs a pitcher allows per nine innings pitched. The formula is: ERA = (Earned Runs × 9) / Innings Pitched. A lower ERA indicates better pitching performance. At the MLB level, an ERA below 3.00 is excellent, 3.00-4.00 is good, and above 5.00 is considered poor. This calculator also handles partial innings by recording additional outs (1 out = 1/3 inning). All calculations happen in your browser — no data is sent to any server.

Features

Pure client-side — your data never leaves your device
Instant ERA calculation with 2 decimal precision
Supports partial innings with out recording
Performance rating based on ERA benchmarks
Works for baseball, softball, and youth leagues
Input validation prevents common data entry errors

How to Use

Enter the total number of earned runs allowed in the Earned Runs field.
Enter the number of full innings pitched in the Innings Pitched field.
If you pitched a partial inning, enter the additional outs (0, 1, or 2) in the Outs field.
Click Calculate ERA to see your earned run average and performance rating.

Common Use Cases

Pitcher evaluation — Track ERA throughout the season for performance assessment.
Scout analysis — Compare pitcher stats across different leagues and levels.
Fantasy baseball — Evaluate pitchers for fantasy league roster decisions.
Youth baseball — Help young pitchers understand their performance metrics.

Frequently Asked Questions

How is ERA calculated?

ERA is calculated as (Earned Runs × 9) / Innings Pitched. For example, if a pitcher allows 3 earned runs in 6 innings, their ERA is (3 × 9) / 6 = 4.50.

What is a good ERA?

In Major League Baseball, an ERA below 3.00 is excellent, 3.00-4.00 is good, 4.00-4.50 is average, and above 5.00 is considered poor.

What are earned runs vs unearned runs?

Earned runs are runs that score without the help of an error or passed ball. Unearned runs result from defensive errors and are not counted in ERA. Only enter earned runs in this calculator.