On-base percentage

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On-base percentage (abbreviated OBP) is a baseball statistic designed to track the rate at which a hitter reaches base as a result of his own actions (as opposed to, for example, defensive lapses). Another way to interpret OBP is the percentage of a player's plate appearances that he does not make an out.

The formula for on-base percentage is

OBP = \frac{H+BB+HBP}{AB+BB+HBP+SF}

where

  • H is Hits
  • BB is Walks
  • HBP is times hit by a pitch
  • AB is At bats
  • SF is Sacrifice Flies

Because there is a high correlation between OBP and runs scored, the use of on-base percentage in player evaluation has gained favor among baseball enthusiasts and front offices in recent years. It has proven to be a more reliable indicator of a player's offensive performance than batting average.

See Also

Baseball Terms
Hits BuntSingleDoubleTripleHome RunFair BallFoul BallGround Rule Double
Fouls Quick Return PitchBalkInfield Fly
Events Double HeaderForfeited GameInning
Achievements Baseball Hall of FameAll-Star GameWorld Series
Positions BatterPitcherCatcherDesignated hitterFielderInfielderOutfielderRunner
Equipment Baseball
Outs OutDouble PlayTriple PlayFielder's ChoiceFly BallForce PlayGround BallLine DriveStrikeout
Places on the Field AlleyBaseBatter's BoxDugoutFair TerritoryFoul TerritoryHome PlateInfieldOutfield
Pitches BallStrike
Achievable Events AssistRunTagPerfect game
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