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ERA Calculator

Enter a pitcher's earned runs and innings pitched to get their exact earned run average (ERA) — the standard measure of pitching performance. Handles baseball innings notation (.1 = one out, .2 = two outs) automatically and rates the result from elite to high.

Runs charged to the pitcher (exclude unearned).
.1 = 1 out, .2 = 2 outs (e.g. 6.2 = 6⅔).

How the ERA Calculator works

Three simple steps. No signup. No installation.

1

Enter earned runs

The number of earned runs charged to the pitcher (exclude unearned runs from errors).

2

Enter innings pitched

Use standard notation — 6.1 means 6 innings and 1 out, 6.2 means 6 innings and 2 outs.

3

Get the ERA

See the exact earned run average ((ER ÷ IP) × 9) plus a rating from elite to high.

What ERA really measures in baseball

Earned run average is the oldest and most widely cited measure of pitching performance, dating back to the early 20th century when relief pitching made win-loss records an unfair way to judge pitchers. ERA answers a simple question: how many earned runs does this pitcher give up per nine innings? Because it is a rate stat, it lets you compare a starter who throws 200 innings against a reliever who throws 60. The formula is ERA = (earned runs ÷ innings pitched) × 9. A sub-3.00 ERA across a full season is excellent; the all-time single-season record is Tim Keefe's 0.86 (1880), and in the modern era Bob Gibson's 1.12 (1968) stands out. ERA has limitations — it depends on the defense behind the pitcher and on official-scorer error judgments — which is why analysts also use FIP and ERA+. But for a fast, intuitive read on how a pitcher is performing, ERA remains the number everyone checks first.

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