What is a good Slugging Percentage (SLG)?

In Major League Baseball, a slugging percentage over .500 is considered excellent, while a percentage over .450 is very good. The league average typically falls around .410-.420. A slugging percentage below .370 is generally considered poor for a full-time player.

What is the difference between Slugging Percentage and On-Base Percentage?

Slugging Percentage (SLG) measures a hitter's raw power by valuing extra-base hits. On-Base Percentage (OBP) measures a hitter's ability to get on base and avoid outs, through hits, walks, or hit-by-pitches. They measure two different but critical offensive skills: power (SLG) and plate discipline (OBP).

Slugging Percentage (SLG) Calculator

Q: What is ISO (Isolated Power)?

Isolated Power (ISO) is a statistic that measures a player's raw extra-base hitting power. It is calculated by subtracting a player's batting average from their slugging percentage (ISO = SLG - BA). This 'isolates' the part of their slugging that comes only from extra-base hits, giving a clearer picture of their power profile.

Accurately measure a baseball or softball player's raw power at the plate.

Singles (1B)

Doubles (2B)

Triples (3B)

Home Runs (HR)

Total At Bats (AB)

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What is Slugging Percentage (SLG)? ⚾

Slugging Percentage (SLG) is a foundational baseball statistic that measures a hitter's raw power and productivity. While batting average treats all hits the same—a single is equal to a home run—slugging percentage correctly weights hits based on the number of bases achieved. It essentially shows the average number of bases a player records per at-bat.

The SLG Formula Explained

The calculation starts by finding a player's **Total Bases (TB)**:

TB = (Singles × 1) + (Doubles × 2) + (Triples × 3) + (Home Runs × 4)

Then, to find the slugging percentage, you simply divide the Total Bases by the player's total At-Bats (AB):

SLG = Total Bases / At Bats

This is why a player who hits for power (many doubles and homers) will have a much higher SLG than a player who hits a similar number of singles.

SLG vs. OBP vs. OPS: The Modern "Slash Line"

In modern baseball analysis, SLG is rarely viewed in a vacuum. It forms a critical part of the "slash line" (AVG/OBP/SLG) that gives a comprehensive look at a hitter's abilities.

On-Base Percentage (OBP): Measures a player's ability to get on base and avoid making an out. It includes hits, walks, and hit-by-pitches. It is the ultimate measure of plate discipline.
Slugging Percentage (SLG): Measures a player's raw power and ability to hit for extra bases.
On-Base Plus Slugging (OPS): A popular hybrid stat created by simply adding OBP and SLG together. While statistically imperfect, it provides a quick and remarkably accurate single-number measure of a player's overall offensive contribution.

As detailed by analytics sites like FanGraphs, OPS combines the two most important offensive skills—getting on base and hitting for power—making it a go-to metric for analysts. To see how today's top power hitters are performing, you can Read Sports News at No Sport Nation.

What is a Good Slugging Percentage?

The standard for a "good" slugging percentage in Major League Baseball can be broken down into tiers. For context and official leaderboards, the MLB.com Glossary is an excellent resource.

.500 or higher: Excellent (Typically All-Star level)
.450 to .499: Very Good (Above-average regular)
.410 to .449: Roughly League Average
.370 to .409: Below Average
Below .370: Poor

Frequently Asked Questions (FAQ)

What is the difference between Slugging Percentage and Batting Average?

Batting Average (BA) measures the rate of hits per at-bat ($H/AB$), treating all hits equally. Slugging Percentage (SLG) measures the rate of *bases* per at-bat ($TB/AB$), giving more value to extra-base hits. A player can have a low batting average but a high slugging percentage if most of their hits are for extra bases.

What is a perfect Slugging Percentage?

A perfect slugging percentage is **4.000**. This would only be possible if a player hit a home run (worth 4 bases) in every single official at-bat.

What is ISO (Isolated Power)?

Isolated Power (ISO) is an advanced stat that better isolates a player's raw power. It is calculated by subtracting Batting Average from Slugging Percentage ($ISO = SLG - BA$). This removes the effect of singles, showing only the average number of *extra* bases a player gets per at-bat. It's a favorite of analysts for identifying true power hitters.