How do you calculate a player's on base percentage?

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On base percentage

In baseball statistics, on base percentage (OBP) 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. It may be calculated as:

(H + BB + HBP) / (AB + BB + HBP + SF) OBP is sometimes referred to as "on base average" or OBA.

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 and 5 at bats with a sacrifice fly, his batting average would be .400 but his on base percentage would be .333.

Credited: http://en.wikipedia.org/wiki/On_base_percentage

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