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Answer» What is On Base Percentage mean? In baseball statistics, on-base percentage (OBP), also known as on-base average/OBA, measures how frequently a batter reaches base. It is the ratio of the batter's times-on-base (TOB) (the sum of hits, walks, and times hit by pitch) to their number of plate appearances. OBP does not credit the batter for reaching base due to fielding errors, fielder's choice, dropped/uncaught third strikes, fielder's obstruction, or catcher's interference. An official MLB statistic since 1984, it is sometimes referred to as on-base average/OBA, as it is rarely presented as a true percentage. On-base percentage is added to slugging average to determine on-base plus slugging (OPS). The on-base percentage of all batters faced by one pitcher or team is referred to as on-base against. reference
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