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MLB Earned Run Average (ERA) Calculator

ERA = ER · 9 / IP.

Compute a baseball pitcher's earned run average — the league's most widely-cited rate stat: ERA = (Earned runs · 9) / Innings pitched. Reports ERA to 2 decimals plus the number of complete games equivalent (IP / 9). Sub-3.00 is excellent; sub-2.00 is historic.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

IP

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ERA = ER · 9 / IP.

In depth

Compute a baseball pitcher's earned run average — the league's most widely-cited rate stat: ERA = (Earned runs · 9) / Innings pitched. Reports ERA to 2 decimals plus the number of complete games equivalent (IP / 9). Sub-3.00 is excellent; sub-2.00 is historic.