What Is an Error in Baseball? How Official Scorers Rule

An error is charged to a fielder when a misplay lets a batter reach base or a runner advance that ordinary effort would have prevented. The official scorer decides every error, usually on dropped balls, bobbled grounders and wild throws. Errors matter beyond the box score: runs that score because of them are unearned, so they do not count against the pitcher’s ERA.

Scoring explained
Errors at a glance
E in the box score
Who decides
The official scorerMLB can review and change scoring decisions after the game
Standard
Ordinary effortWould an average fielder have made the play?
Fielding error
A bobbled, dropped or muffed ball
Throwing error
A throw that pulls a fielder off the bag or sails away
Earned runs
Runs that score because of an error are unearnedThe pitcher’s ERA is protected
Box score
Shown as E followed by the position numberE6 is an error on the shortstop
Fielding percentage
Plays made divided by total chancesErrors lower it

What Is Not an Error

Play Scored as
Failing to reach a ball A hit, no matter how close the fielder came
A mental mistake, like throwing to the wrong base No error unless there is a physical misplay
Wild pitch Charged to the pitcher, not an error
Passed ball Charged to the catcher, not an error
Letting a foul ball drop to extend an at bat An error, if it should have been caught with ordinary effort

Position Numbers

Scorers use numbers for positions: 1 pitcher, 2 catcher, 3 first base, 4 second base, 5 third base, 6 shortstop, 7 left field, 8 center field and 9 right field. That is why an error on the third baseman reads E5.

Related

What is a sacrifice fly · What is a good ERA · What is a complete game

Scoring rules from the MLB.com glossary.