How to Calculate On Base Percentage


Among the statistics baseball managers and coaches use to track the performance of their players is on-base percentage. Roughly, this is how often a player gets on base compared to how often he's up to bat, or times on base divided by times at bat. The formula is a little more complicated than that, however, and infrequently can lead to some peculiar results.

Calculating OBP

  • To calculate a player's on-base percentage, first add the number of his hits, the number of times he's walked and the number of times he's been hit by a pitch. Divide that by the total number of his times at bat, plus his walks, the times he's been hit by a pitch and the number of sacrifice flies he's hit, or (Hits + walks + hit by pitch) / (at bats + walks + hit by pitch + sacrifice flies). For example, if a player has been up to bat 375 times and has gotten 112 hits, 40 walks, been hit by the pitch 4 times and hit 5 sacrifice flies, his OBP will be (112 + 40 + 4) divided by (375 + 40 + 4 + 5) = 156 divided by 424 = .368.

Quirky Results

  • OBP doesn't always accurately reflect how often a play actually gets on base, though. For example, a player who's at bat three times and reaches first base by hitting into a fielder's choice, getting on base thanks to an error, and via catcher's interference, still will have an OBP of .000. Also, in certain circumstances a player's on-base percentage can be lower than his batting average, because sacrifices aren't counted as an at-bat but are used in calculating OPB. For example, suppose a player is at bat 10 times, gets three hits and hits one sacrifice fly. The sacrifice won't count towards his batting average, so he'll be 3 for 9, for an average of .333. His OBP, however, will be 3 divided by (9 + 1) = .300.

Related Searches


  • Photo Credit Design Pics/Design Pics/Getty Images
Promoted By Zergnet


You May Also Like

Related Searches

Check It Out

10 Delicious Game Day Eats That Rival the Game

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!