Slugging Percentage Calculator
Calculate slugging percentage (SLG) from singles, doubles, triples, home runs, and at-bats. SLG = total bases / at-bats.
.518
Excellent
SLG weights each hit by its bases (1B=1, 2B=2, 3B=3, HR=4) and divides total bases by at-bats, measuring power per at-bat.
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Calculation Method
Slugging percentage (SLG) measures a hitter's power by counting not just whether they got a hit, but how far they advanced. Where batting average treats every hit the same, slugging weights each hit by the number of bases it earns — a home run is worth four times as much as a single. This calculator takes your singles, doubles, triples, and home runs, converts them to total bases, and divides by your at-bats.
The Slugging Percentage Formula
SLG = Total Bases / At-Bats
Despite the name, SLG is not a true percentage — it can exceed 1.000. The theoretical maximum is 4.000 (a home run in every at-bat). It is read like batting average, as a three-decimal figure.
Worked Example
A hitter has, in 500 at-bats, 90 singles, 30 doubles, 3 triples, and 25 home runs:
- Singles: 90 × 1 = 90 bases
- Doubles: 30 × 2 = 60 bases
- Triples: 3 × 3 = 9 bases
- Home runs: 25 × 4 = 100 bases
- Total bases: 90 + 60 + 9 + 100 = 259
- SLG: 259 / 500 = .518
A .518 slugging percentage reflects genuine middle-of-the-order power.
Slugging Benchmarks
| SLG | Rating |
|---|---|
| .550+ | Elite power |
| .450 – .549 | Excellent |
| .400 – .449 | Above average |
| .350 – .399 | Average |
| Below .350 | Below average |
Isolated Power (ISO)
Slugging includes singles, so a high-average singles hitter can post a respectable SLG without much real power. To isolate extra-base power, analysts subtract batting average from slugging to get Isolated Power (ISO = SLG − AVG). In the example above, an ISO of .518 − about .296 ≈ .222 confirms genuine power rather than empty contact.
Slugging and OPS
Slugging is one half of OPS (on-base plus slugging), the modern shorthand for total offensive value. Add SLG to on-base percentage and you get a single number that rewards both getting on base and hitting for power. Use the OPS calculator to combine the two.
Common Pitfall
Remember that the denominator is at-bats, not plate appearances. Walks and hit-by-pitches are excluded entirely — they do not advance the batter under SLG's logic — so a walk-heavy hitter's slugging percentage is unaffected by those trips to the plate.
Note: This calculator is for educational use. Verify the hit breakdown matches the official box score for exact figures.
Frequently Asked Questions
SLG = total bases / at-bats, where total bases = singles + 2 x doubles + 3 x triples + 4 x home runs. It measures power by weighting extra-base hits.
.500 or higher is excellent, around .400 is solid, and below .350 is weak. Elite power hitters can exceed .600 in big seasons.
Batting average treats every hit equally, while slugging weights hits by how many bases they earn. A player with many doubles and home runs has a much higher SLG than AVG.
How do you calculate slugging percentage?
What is a good slugging percentage?
How is SLG different from batting average?
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OPS Calculator
Calculate OPS (On-base Plus Slugging) by adding on-base percentage and slugging percentage. Enter OBP and SLG directly or the underlying stats.