Slugging Percentage Calculator
Slugging percentage (SLG) is baseball's standard measure of a hitter's power. Where batting average treats every hit identically, slugging percentage rewards extra-base hits by counting the total bases a batter earns per at-bat: a single is worth one base, a double two, a triple three and a home run four. Add those weighted bases together to get total bases, divide by at-bats, and you have slugging percentage, a decimal usually shown to three places. A value around .400 is roughly average, .450 is good and .550 or higher is excellent, the territory of genuine sluggers. Because a single home run earns four bases from one at-bat, slugging percentage can climb above 1.000 and in theory reaches a maximum of 4.000. This calculator applies the standard formula exactly: enter singles, doubles, triples, home runs and at-bats, and it returns total bases and slugging percentage so you can see how the power is built. It pairs naturally with on-base percentage, and the two added together form OPS, a quick combined measure of overall offensive value. Every figure here is computed deterministically from the formula shown below, with a worked example that reconciles exactly to the calculator so you can follow each step.
Slugging percentage is total bases per at-bat: SLG = (1B + 2x2B + 3x3B + 4xHR) / AB. With 90 singles, 30 doubles, 5 triples, 25 home runs and 500 at-bats, total bases are 265 and SLG is .530.
Slugging percentage formula
SLG = TB / AB
TB = (1 x 1B) + (2 x 2B) + (3 x 3B) + (4 x HR)
1B = singles, 2B = doubles, 3B = triples
HR = home runs, AB = at-bats
Total bases weight each hit by how many bases it earns, so power is rewarded. Dividing by at-bats expresses that power on a per-at-bat basis.
Worked example
A hitter has 90 singles, 30 doubles, 5 triples and 25 home runs across 500 at-bats.
- Singles: 90 x 1 = 90 bases.
- Doubles: 30 x 2 = 60 bases.
- Triples: 5 x 3 = 15 bases.
- Home runs: 25 x 4 = 100 bases.
- Total bases = 90 + 60 + 15 + 100 = 265.
- SLG = 265 / 500 = 0.530.
The slugging percentage is .530. These are the calculator's default inputs, so the result above matches the widget exactly.
Slugging percentage calculator: frequently asked questions
What is slugging percentage (SLG)?
Slugging percentage measures a hitter's power by counting the total bases they earn per at-bat. Unlike batting average, which treats every hit the same, slugging percentage weights extra-base hits more heavily, so a double is worth twice a single and a home run four times. A slugging percentage of .450 is good and .550 or above is excellent.
How is slugging percentage calculated?
Slugging percentage equals total bases divided by at-bats. Total bases are computed by giving one base for each single, two for each double, three for each triple and four for each home run, then adding them together. The result is divided by at-bats and shown as a decimal to three places.
What are total bases?
Total bases is the weighted count of bases gained on hits: singles count one, doubles two, triples three and home runs four. So a hitter with 90 singles, 30 doubles, 5 triples and 25 home runs has 90 plus 60 plus 15 plus 100, which is 265 total bases. Walks and hit-by-pitch do not add total bases.
How is SLG different from on-base percentage?
On-base percentage measures how often a hitter reaches base by any means, including walks. Slugging percentage measures the power of the hits themselves, with no credit for walks. Added together they form OPS (on-base plus slugging), a quick combined measure of a hitter's overall offensive value.
Can slugging percentage exceed 1.000?
Yes. Because a home run is worth four total bases from a single at-bat, a hitter can accumulate more total bases than at-bats, pushing slugging percentage above 1.000. The theoretical maximum is 4.000, which would require a home run in every at-bat.
Official sources
- Public health and sport participation context: US Centers for Disease Control and Prevention (CDC). As at 25 June 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. This is general information, not financial, tax, legal or investment advice.