On base percentage

In baseball statistics, on base percentage (OBP) (sometimes referred to as on base average (OBA)) is a measure of how often a batter gets to first base for any reason other than a fielding error or a fielder's choice.

Related Topics:
Baseball statistics - Batter - Fielding error - Fielder's choice

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Though extremely unlikely, it is possible for a player's on base percentage to be lower than his batting average (H/AB). If a player had 2 hits in 5 at bats with a sacrifice fly, his batting average would be .400, but his on base percentage would be .333.

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To calculate on base percentage (OBP) use this formula from the Major League Baseball site.

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:OBP = rac{H+BB+HBP}{AB+BB+HBP+SF}

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where

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• H = hits
• BB = bases on balls
• HBP = hits by pitch
• AB = at bats
• SF = sacrifice flies
 
On base percentage: See also ►