What is OPS in Baseball
OPS (On-Base Plus Slugging) is a composite baseball statistic that combines a hitter's on-base percentage and slugging percentage into a single number to measure overall offensive value.
OPS — On-Base Plus Slugging — is one of the most widely used advanced statistics in modern baseball. It combines two key offensive metrics into a single number that gives a comprehensive snapshot of a hitter's value at the plate: how often they get on base and how much power they produce when they make contact.
The Formula
$$\text{OPS} = \text{On-Base Percentage (OBP)} + \text{Slugging Percentage (SLG)}$$
- On-Base Percentage (OBP) — Measures how often a batter reaches base via hit, walk, or hit-by-pitch, divided by plate appearances
- Slugging Percentage (SLG) — Measures the total number of bases a batter earns per at-bat, weighting extra-base hits more heavily than singles
OPS Scale — What Is a Good OPS?
| OPS | Assessment |
|---|---|
| 1.000+ | Historic — MVP-caliber, all-time great season |
| .900–.999 | Elite — superstar hitter |
| .800–.899 | Very good — above-average power hitter |
| .700–.799 | Average — solid everyday player |
| .600–.699 | Below average — starting position at risk |
| Under .600 | Poor — replacement-level offense |
Why OPS Matters
OPS gained mainstream acceptance in the analytics era because it captures more of a hitter's value than batting average alone. A player with a high batting average who hits mostly singles and rarely walks may be less valuable than a player with a lower average who draws walks and hits for extra bases. OPS reflects both dimensions.
OPS+ (Adjusted OPS)
OPS+ is a park- and league-adjusted version of OPS, scaled so that 100 is always exactly league average:
- OPS+ of 130 = 30% better than league average
- OPS+ of 70 = 30% worse than league average
OPS+ allows fair comparison of hitters across different eras, ballparks, and leagues — making it one of the most useful historical comparison tools in baseball.
Limitations of OPS
- Mathematically, OBP and SLG use different denominators (plate appearances vs. at-bats), so adding them is technically imprecise
- wOBA (Weighted On-Base Average) and wRC+ are considered more sophisticated alternatives by sabermetricians
- OPS doesn't account for baserunning, defense, or positional value