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On-base Percentage - OBP

What is On-base Percentage - OBP?

A statistic in baseball that measures the rate at which a batter gets on base for any reason excluding fielding errors, fielder's choice, fielder's obstruction, or catcher's interference.

On-base Percentage = Hits (H) + Base on Balls (BB) + Hit By Pitch (HBP) / At Bats (AB) + BB + HBP + Sacrifice Flies (SF)

Also referred to as "On-base Average - OBA"

Sporting Charts explains On-base Percentage - OBP

The formula for determining On-Base Percentage (OBP) is to add the batter's number of hits, base on balls, and times hit by pitch together and divide this number by the sum of at-bats, base on balls, times hit by pitch and sacrifice flies. Most leadoff hitters in baseball typically have a high OBP as these batters have the ability to get on base consistently on their own and are slotted in the beginning of the order. It is possible for a player to have a higher batting average than OBP, but this is usually only if they do not draw many walks or get hit by many pitches or if they hit an inordinate number of sacrifice flies.

Players with a high On-base Percentage are often put into the lead off position as they are traditionally the most likely to get on base and become a potential scorer for the team. 

On-base Percentage Records

  • Career: Ted Williams - .4817
  • Season: Barry Bonds - .6094 (2004)

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