Add up your hits, walks, and hit by pitches and divide by the number you get when adding up your at bats, walks, hit by pitches, and sacrifice flies. As an example, we'll use Albert Pujols 2011 stats ...
Hits - 173
Walks - 61
Hit by Pitches - 4
At Bats - 579
Sacrifice Flies - 7
The OBP would be calculated as ...
(173 + 61 + 4) divided by (579 + 61 + 4 + 7) which equals ...
238 divided by 651 which equals .03655 which would round to .0366.
Albert's OBP for the 2011 season was .0366.
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