Slugging Percentage Calculator
Calculate slugging percentage (SLG) — total bases per at bat — from a hitter's singles, doubles, triples, and home runs.
Informational only — not a substitute for official league statistics or professional judgment.
How it's calculated
Assumptions
- Walks, hit-by-pitches, and sacrifices don't count — SLG uses at bats, not plate appearances.
- Enter singles specifically, not total hits: singles = hits − doubles − triples − home runs.
Source: MLB Glossary — Slugging Percentage (SLG)
Last reviewed: July 2026
Frequently asked questions
What's considered a good slugging percentage?
In recent MLB seasons league-average SLG has sat around .400–.420. A SLG of .450+ is solidly above average, .500+ marks a legitimate power threat, and .550 or better over a full season is elite, All-Star-level production.
My stat sheet lists hits, not singles — how do I get singles?
Subtract extra-base hits from total hits: singles = H − 2B − 3B − HR. For example, a player with 165 hits, 35 doubles, 3 triples, and 27 home runs had 165 − 35 − 3 − 27 = 100 singles.
Why can slugging percentage be greater than 1.000?
Despite the name, SLG isn't a percentage — it's average total bases per at bat, with a theoretical maximum of 4.000 (a home run in every at bat). A hitter who goes 2-for-4 with two home runs slugs 2.000 for the day.
How is SLG different from ISO (isolated power)?
ISO is slugging percentage minus batting average, which strips out singles and measures only extra-base power. Two hitters can share a .450 SLG while one gets there on singles volume and the other on home runs — ISO separates them.
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