Earned Run Average (ERA) Calculator

ERA = (earned runs ÷ innings pitched) × game length. For example, allowing 2 earned runs over 6 innings in a 9-inning game gives (2 ÷ 6) × 9 = 3.00.

Total runs allowed counts every run scored off a pitcher, while earned runs exclude runs that scored because of a fielding error — only runs the pitcher is considered responsible for. ERA is always calculated from earned runs.

Enter only the innings you completed, then pick the remaining outs (0, 1, or 2) below. 1 out converts to 1/3 inning, and 2 outs converts to 2/3 inning automatically.

Professional baseball typically uses 9 innings, while youth leagues and some amateur leagues use 7. Since ERA scales with game length, picking the right one keeps your number accurate for your league.

They show how your ERA would move if your earned runs or innings pitched changed by ±1 or ±2 from what you entered — a quick way to see how much one run or inning could swing your rate before the next game.

No. All calculations happen entirely in your browser and are never sent to or stored on a server.