# Slugging Percentage Calculator

Calculate baseball slugging percentage (SLG) from singles, doubles, triples, home runs, and at-bats. Also shows total bases and isolated power (ISO).

## What this calculates

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.

## Inputs

- **At-Bats** — min 1, max 10000
- **Singles** — min 0, max 5000
- **Doubles** — min 0, max 1000
- **Triples** — min 0, max 500
- **Home Runs** — min 0, max 1000

## Outputs

- **Slugging Percentage (SLG)** — formatted as text — Slugging percentage as a three-decimal value
- **Total Bases** — Sum of all bases from hits
- **Batting Average (AVG)** — formatted as text — Hits divided by at-bats
- **Isolated Power (ISO)** — formatted as text — SLG minus AVG, measures raw extra-base power

## Details

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.

## Frequently Asked Questions

**Q: What is a good slugging percentage?**

A: In MLB, a .450 SLG is above average, .500 is very good, and .550 or higher is elite. The league average hovers around .400 to .420 in most seasons. For context, a player who hits nothing but singles with a .300 batting average has a .300 SLG. The extra-base hits are what push it higher.

**Q: How is SLG different from batting average?**

A: Batting average treats all hits equally: a single and a home run both count as one hit. Slugging percentage weights hits by total bases, so a home run (4 bases) is worth four times a single (1 base). SLG tells you about power, while batting average tells you about contact ability.

**Q: What is isolated power (ISO)?**

A: ISO equals slugging percentage minus batting average. It isolates the extra-base contribution by removing singles. A player with a .300 AVG and .500 SLG has an ISO of .200. An ISO above .200 is strong, and above .250 is elite. It is one of the cleanest measures of raw power.

**Q: Why does SLG not include walks?**

A: SLG was designed to measure hitting power, not plate discipline. Walks are accounted for in on-base percentage (OBP). If you want a stat that combines both, look at OPS (on-base plus slugging), which adds OBP and SLG together. OPS is widely used as a quick all-around offensive measure.

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Source: https://vastcalc.com/calculators/health/slugging-percentage
Category: Health & Fitness
Last updated: 2026-04-08