Sports Analytics & Fitness

Baseball SLG (Slugging Percentage) Calculator

Calculate Slugging Percentage (SLG) to measure a baseball player's power hitting capability and average bases recorded per at-bat.

Total Bases
265
Slugging Pct (SLG).530

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Measuring Raw Power

While Batting Average (AVG) measures how often a player gets a hit, it has a fatal flaw: it treats every hit exactly the same. In the AVG calculation, a softly hit bloop single is mathematically equal to a 450-foot grand slam.

Slugging Percentage (SLG) was created to measure the absolute power and destructive impact of a hitter. It assigns heavily weighted value to extra-base hits.

The Weight of the Bases

Instead of counting "Hits", the Slugging formula counts "Total Bases". A double is worth twice as much as a single, and a home run is worth four times as much.

The Formula

To find SLG, you divide the Total Bases by the total At Bats.

SLG = Total Bases / At Bats

Where:
Total Bases=
Singles + (2 * Doubles) + (3 * Triples) + (4 * Home Runs)
At Bats=
Official plate appearances

What is a "Good" Slugging Percentage?

Because the numerator can be drastically higher than the denominator, SLG is the only standard batting metric that can theoretically exceed 1.000 (if a player hits a home run in every single at-bat, their SLG is 4.000).

  • .400: League average.
  • .500: A very strong power hitter.
  • .600+: An elite MVP candidate. Babe Ruth holds the all-time career record with an unbelievable .690 Slugging Percentage.

Frequently Asked Questions

No. Walks (Base on Balls) do not count as Total Bases, and they do not count as At Bats. Therefore, a walk has absolutely zero mathematical impact on your Slugging Percentage.

Slugging is often associated with massive power hitters who hit home runs. However, an incredibly fast player who hits the ball into the gap and frequently sprints for Triples (worth 3 bases) will also generate a massive Slugging Percentage.

ISO is an advanced metric derived directly from SLG. You calculate it simply by subtracting Batting Average from Slugging Percentage (SLG - AVG). It tells you exactly how many 'extra bases' a player averages per hit.

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