Slugging Percentage and OPS Calculator

Slugging percentage is total bases divided by at bats. Total bases weight each hit by its value: singles count 1, doubles 2, triples 3 and home runs 4. So total bases equals 1B plus 2 times 2B plus 3 times 3B plus 4 times HR, and dividing by at bats gives SLG.

OPS is on-base plus slugging, the simple sum of on-base percentage and slugging percentage. It rewards both reaching base and hitting for power in one number. This tool adds the on-base percentage you enter to the slugging it computes, so leave OBP at zero if you only want SLG.

Batting average counts every hit the same, dividing total hits by at bats. Slugging percentage rewards extra-base hits, so a doubles-and-homers hitter can post a slugging figure far above their batting average while a singles hitter stays close to it.

In modern Major League Baseball a slugging percentage near .400 is roughly league average, .500 is very good, and .550 or higher marks elite power. Context like the era and ballpark shifts these bars, but they are useful rough anchors.

Yes. Because one at bat can produce up to four total bases, slugging is not capped at 1.000 the way batting average is. The theoretical maximum is 4.000, a home run in every at bat, and small samples like the two-homers-in-four example easily clear 1.000.

Use official at bats, which exclude walks, hit by pitch, sacrifices and catcher interference. Since slugging divides total bases by at bats and those plate appearances are not at bats, adding them would distort the result.

Every single, double, triple and home run is also an at bat, so the sum of your four hit counts cannot be larger than the at bats you entered. If it is, the tool shows a message asking you to fix the numbers rather than returning a nonsensical rate.

No. Leave any hit type at zero if the batter had none. A line with only singles still produces a valid slugging percentage, and the totals update as soon as you change a field.

No. The calculation happens entirely in your browser, so the stat lines you enter are never uploaded or stored on a server. Refreshing the page simply resets the fields to their defaults.