ERA = (Earned Runs × 9) ÷ Innings Pitched
Earned Runs = runs allowed that are not the result of errors or passed balls
Innings Pitched = total outs recorded divided by 3
Example: 10 earned runs in 30 innings
ERA = (10 × 9) ÷ 30
ERA = 3.00
ERA = (Earned Runs × 9) ÷ Innings Pitched
Earned Runs = runs allowed that are not the result of errors or passed balls
Innings Pitched = total outs recorded divided by 3
Example: 10 earned runs in 30 innings
ERA = (10 × 9) ÷ 30
ERA = 3.00