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On-base percentage
In
baseball statistics
,
on-base percentage
(OBP; sometimes referred to as
on-base average/OBA
, as the statistic is rarely presented as a true
percentage
) is a measure of how often a
batter
reaches base for any reason other than a
fielding error
,
fielder's choice
,
dropped/uncaught third strike
,
fielder's obstruction
, or
catcher's interference
(the latter two are ignored as either
times-on-base (TOB)
or
plate appearances
in calculating OBP). OBP is added to
slugging average
to determine
on-base plus slugging
(OPS). It first became an official
MLB
statistic in 1984.
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