Baseball Stats CalculatorSlugging Percentage Calculator
Enter total hits, the extra base hits and at bats. We find singles and total bases for you.
Slugging percentage
- Singles
- Total bases
- Batting average
- Isolated power
By the Baseball Stats Calculator team · Formulas checked against Official Baseball Rules 9.21 · Last updated October 21, 2026 · How we check our math
How do you calculate slugging percentage?
Find total bases: 1 for each single, 2 for each double, 3 for each triple and 4 for each home run. Divide total bases by at bats. For example, 100 singles, 30 doubles, 5 triples and 20 home runs make 255 total bases. In 500 at bats, that is a .510 slugging percentage.
SLG = (1B + 2 × 2B + 3 × 3B + 4 × HR) ÷ AB
Rule 9.21(c) of the Official Baseball Rules sets this method. The MLB.com glossary gives the same formula.
Worked example from a box score
A softball player has 18 hits in 50 at bats. Of those hits, 4 are doubles, 1 is a triple and 2 are home runs. Singles are 18 minus 7, which is 11. Total bases are 11 + 8 + 3 + 8 = 30. Slugging is 30 ÷ 50 = .600.
What is isolated power?
Isolated power is slugging minus batting average. It shows how much of a hitter's output comes from extra bases. In the first example, .510 minus .310 is .200.
What is a good slugging percentage?
The MLB league slugging percentage was .404 in 2025, .399 in 2024 and .414 in 2023, per Baseball-Reference. A hitter above about .415 slugged better than the league in each of those years. High school and youth numbers vary by league and bat rules.
| Season | SLG |
|---|---|
| 2025 | .404 |
| 2024 | .399 |
| 2023 | .414 |
Source: Baseball-Reference batting averages by year.
Rounding
Slugging is shown to three places with no leading zero, the same as batting average. A value of 1 or more keeps its first digit, such as 1.250.
Add on base percentage to get OPS with the OPS calculator.
Frequently asked questions
Is slugging percentage really a percentage?
Not quite. It is total bases per at bat, so it can go above 1. The highest possible is 4.000, a home run in every at bat.
Do walks count in slugging?
No. Walks and hit by pitch are not at bats and are not hits, so they do not change slugging. Use OBP to give credit for walks.
What if I only know total hits?
Enter total hits plus doubles, triples and home runs. The tool finds singles by taking extra base hits away from total hits.