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ERA Calculator

Earned run average (ERA): earned runs allowed per nine innings pitched.

Enter values

Use .1 and .2 for one and two outs (e.g. 118.2).

Results update as you type.

Result

ERA

3.19

Innings pitched
118.67
Earned runs per inning
0.354

About the ERA Calculator

Earned run average (ERA): earned runs allowed per nine innings pitched.

Also known as: earned run average, era baseball, pitcher era.

How to use this calculator

  1. Enter earned runs, innings pitched, innings per game.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

ERA = earned runs ÷ innings pitched × 9

Worked example

Using the values pre-filled in the calculator above:

  • Earned runs = 42
  • Innings pitched = 118.2
  • Innings per game = 9

the calculator returns:

  • ERA: 3.19
  • Innings pitched: 118.67
  • Earned runs per inning: 0.354