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Slugging average is the ratio of the total number of bases achieved on hits divided by the number of official times at bat. The variables used for hitterswere: batting average (ba), runs batted in (rbi's), slugging average (sa), runs scored (r), strike outs (so), stolen bases (sb), and fielding average (fa).
Calculating Slugging Percentage. 1  1. Understand slugging percentage. Also called slugging average, SA, or SLG, this is a player's average number of bases per bat. 2  2. Find the number of singles. Most player stats don't include singles, but it's easy to figure out from other stats. 3  3. Calculate the number of bases.