Slugging Percentage (SLG) Calculator (Baseball)

LAST UPDATE: March 8th, 2020

SLG Calculator

What is Slugging Percentage?

SLG is a baseball statistic used to put a batter’s number of bases they have earned through batting in comparison to the number of times they have been at the plate.

It is intended to be another tool for measuring a batter’s ability to earn bases along with batting average and on-base percentage as it includes the total number of bases earned as opposed to just the amount of time they reach first base.

How to calculate SLG

In Baseball, on slugging percentage is calculated as follows:

Slugging Percentage (SLG) = (1 base hits + (2 x 2 base hits) + (3 x 3 base hits) + (4 x home runs)) / at bats.


If a batter has been at bat 127 times and in that time has made: 20 1 base hits, 5 2 base hits, 1 3 base hit, and 4 home runs, then:

20 1 base hits are = 20.

5 2 base hits are 5 x 2 = 10.

1 3 base hit is 1 x 3 = 3.

4 home runs is 4 x 4 = 16.

Total bases earned is 20 + 10 + 3 + 16 = 49.

49 divided by 127 at bats is 0.386

Therefore, the batter’s on slugging percentage is 0386.

What qualifies as a “hit”?

A hit records when the batter safely reaches first base after hitting the ball into fair territory without the benefit of an error or a fielder’s choice.

If the batter (or runner) attempts another base and is caught out, they are still credited with the hit as long as they have reached 1st base.

2 base hits, 3 base hits, and home runs are all the same qualifications as a “hit”, however, they are when the batter arrives at that base in the same play.

What counts as an “At Bat”?

An “at bat” is counted each time the player is at bat. At bats are not counted in specific circumstances, including:

  • The batter hit by a pitch
  • A sacrifice fly or sacrifice hit
  • Base on balls
  • The inning ends while still at bat
  • The batter is replaced by another hitter before the turn is complete


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