Slugging Percentage Calculator
Slugging percentage measures a batter's power by weighting extra-base hits more heavily than singles. Unlike batting average, which treats all hits the same, SLG rewards doubles, triples, and home runs. Enter your hitting stats to calculate SLG, total bases, and isolated power.
Slugging percentage is calculated as total bases divided by at-bats. A single is worth 1 base, a double is worth 2, a triple is worth 3, and a home run is worth 4. So a player with 90 singles, 25 doubles, 3 triples, and 30 home runs in 500 at-bats has 90 + 50 + 9 + 120 = 269 total bases, giving a .538 slugging percentage.
The MLB league average SLG typically falls around .400 to .420. A .500 SLG is very good, and anything above .550 is elite. The single-season record is Barry Bonds' .863 in 2001. Unlike on-base percentage, slugging percentage does not account for walks, hit-by-pitches, or sacrifice flies.
Isolated power (ISO) is slugging percentage minus batting average. It strips out singles to measure pure extra-base power. An ISO above .200 indicates strong power, while .250 or higher is elite. ISO is useful for comparing players whose batting averages differ widely.