Slugging Percentage = ( (Singles) + (Doubles x 2) + (Triples x3) + (Home Runs x 4) ) / At Bats
You could also look at it as Total Bases / At Bats
Since total bases isn't something you might remember after the game, you'll want some software that figures out slugging percentage for you. Try TomorrowsPro.com. It's a great site and it's very easy to use. You enter in your schedule and as the games happen you enter in your stats. It will automatically calculate Batting Average, On-Base Percentage, and Slugging Percentage.
It also handles other stats. Here are all the Baseball stats the software will handle:
Hitting - PA-Plate Appearances, AB-At Bats, H-Hits, 1B-Singles, 2B-Doubles, 3B-Triples, HR-Home Runs, R-Runs, RBI-Runs Batted In, BB-Walks, HBP-Hit By Pitch, K-Strikeouts, SB-Stolen Bases, CS-Caught Stealing, SH-Sacrifice Bunts, SF-Sacrifice Fly, DI-Reached 1B on Defensive Interference, ROE-Reached on Error, FC-Fielder's Choice, AVG-Batting Average, OBP-On Base Percentage, SLG%-Slugging Percentage, OPS-On-base plus slugging
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Pitching - Record-Record ( W-L-T ), IP-Innings Pitched, ER-Earned Runs, R-Runs, H-Hits, HR-Home Runs, BB-Walks, K-Strikeouts, HB-Hit Batsman, S-Saves, CG-Complete Games, Strikes-Strikes Thrown, Balls-Balls Thrown, PC-Pitch Count, ERA-Earned Run Average, WHIP-Walks + Hits per Inning Pitched
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| Fielding - Inn-Innings Played, PO-Put Outs, A-Assists, FE-Fielding Errors, TE-Throwing Errors, FPct-Fielding Percentage, DPS-Double Plays Started, DPT-Double Plays Turned, PB-Passed Balls (Catchers), CS-Caught Stealing (Catchers), SBA-Stolen Base Attempts (Catchers), CS%-Caught Stealing Percentage (Catchers) |