OBA Calculator
Definition – What is OBA?
Opponents Batting Average (OBA) gives the batting average of all batters against a specific pitcher.
It is considered useful as it gives a pitcher-oriented number that is directly comparable to the popular Batting Average (BA), making it easy for fans to understand.
It is also known as “Batting Average Against (BAA).”
Formula – How to calculate OBA
OBA = Hits ÷ (Batter Faced – Walks – Hit by Pitch – Sacrifice Hits – Sacrifice Flies – Catcher’s Interference)
Example
If a pitcher has 190 hits, 43 walks, 677 batters faced, 3 hit by pitch, 6 sacrifice hits, 7 sacrifice flies, and 1 catcher interference then:
OBA = 190 ÷ (677 – 43 – 3 – 6 – 7 – 1)
OBA = 190 ÷ 617
OBA = 0.308
Therefore, the pitcher’s OBA is 0.308.
Sources and more resources
- Wikipedia – Batting Average Against – Wikipedia entry on BAA.
- Rules on baseball and baseball statistics from Major League Baseball, NCAA (Baseball), NCAA (Softball), NCAA (Baseball and Softball), NFHS, and the International Baseball Federation.