Earned runs a pitcher allows per nine innings. Earned runs exclude runs the official scorer judges would not have scored without a fielding error or a passed ball. Innings are counted in outs, so 200.1 innings in baseball notation means 200⅓.
Earned Run Average (ERA)
Also written: ERA
Standard statistic · MLB
Formula
ERA = 9 × ER ÷ IP
On StatVault
Shown on every MLB profile's pitching table (the published season figure) and ranked on the career ERA board on the MLB leaders page, with the qualifier stated on the page.
Shown on: MLB player profiles — pitching table, column ERA