re: SEC stats 4/15 - LSU leading in ERA, Fields beast mode

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How does fields have a avg of 500 but on base of 471? Am I missing something ?

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He has a sacrifice fly, which counts as a plate appearance of 0 for 1 when determining on base %. He has no walks yet which would swing it in the other direction.

It does seem weird though, but his batting average is 8 for 16 (.500), while his on base is 8 for 17 (.471) counting that sac fly

Boh already competently answered the question of why Fields's on-base percentage is lower than his batting average (a rare occurrence indeed), but I just wanted to embellish his answer slightly. From the omniscient Wikipedia:

"For small numbers of at-bats, it is possible (though unlikely) for a player's on-base percentage to be lower than his batting average (H/AB). This happens when a player has almost no walks or times hit by pitch, with a higher number of sacrifice flies (e.g. if a player has 2 hits in 6 at bats plus a sacrifice fly, his batting average would be .333, but his on-base percentage would be .286). The player who experienced this phenomenon with the most number of at-bats in a season was Ernie Bowman, who over 125 at-bats in 1963 had a batting average of .184 and an on-base percentage of .181."

On-base percentage is calculated using this formula:

OBP = {H+BB+HBP} / {AB+BB+HBP+SF}