What Is OPS in Baseball?
OPS — on-base plus slugging — is the most popular one-number summary of a hitter. It rewards both reaching base and hitting for power, which is why it shows up on broadcasts, baseball cards, and fantasy sheets alike.
What OPS measures
OPS answers two questions at once: how often does a hitter avoid making an out, and how much damage do they do when they connect? On-base percentage covers the first, slugging percentage the second. Adding them produces a single figure that correlates strongly with how many runs a lineup scores.
How to calculate OPS by hand
Compute on-base percentage as (hits + walks + hit-by-pitch) ÷ (at-bats + walks + hit-by-pitch + sacrifice flies). Compute slugging percentage as total bases ÷ at-bats, where total bases counts a single as one, a double as two, a triple as three, and a home run as four. Then add the two unrounded numbers and round once — a hitter with a .368 OBP and .444 slugging has an .811 OPS.
The unrounded step matters: if you add two already-rounded values you can land a point off from the official figure. The embedded calculator above always uses full precision.
What is a good OPS at each level?
- MLB: .900+ is a star, .750 is roughly average, under .600 is a weak bat.
- College: the offensive environment runs higher; .900+ is common for everyday regulars on good teams.
- High school: numbers are inflated by uneven competition, so OPS is best used to compare players within the same league rather than against pro benchmarks.
Limitations
OPS weights on-base percentage and slugging equally, but getting on base is actually worth more toward scoring runs — roughly 1.7 times as much. It also mixes two different denominators, which is statistically untidy. More refined stats like wOBA and wRC+ fix these issues, but OPS remains popular because it is easy to compute and understand.