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How to Calculate Slugging Percentage

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What is Slugging Percentage?
As the term implies, slugging percentage is baseball’s way of measuring a hitter’s overall power and effectiveness. It’s obviously much easier just to compare home run numbers or RBI’s, but using those statistics alone takes some of the fun out of baseball statistics. Put concisely, slugging percentage is calculated as the total number of bases accumulated by a hitter divided by the number of official at-bats for that particular hitter.

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How to Calculate a Hitter’s Slugging Percentage
The hardest part of calculating slugging percentage is sorting out what counts as an at-bat and what does not. Anytime a batter is walked, hit by a pitch, or sacrifices (bunt or fly ball sacrifice to move a runner to the next base), it is not counted as an at-bat. Everything else (anything from a strike out to a home run) is considered an at-bat. To calculate slugging percentage, divide the total number of bases accrued by a batter, and divide it by the number of at-bats for the hitter. For instance, if a hitter is just beginning the season and his first time to bat he hits a home run, his slugging percentage is 4.000 (4 bases / 1 at bat). If a hitter goes one for three in a game, with one single, his slugging percentage for that game is 0.333 (1 base / 3 at bats). Slugging percentage is usually calculated out to three decimals, such as 0.550.