On-Base Plus Slugging (OPS)
Also known as: OPS
OPS is a hitting stat that adds on-base percentage and slugging percentage. It combines reaching base and hitting for power in one number.
On-base percentage measures how often a hitter reaches base by any means: hit, walk, or hit-by-pitch. Slugging percentage measures total bases per at-bat, crediting extra-base hits more heavily than singles. OPS simply adds the two together. That is a mathematically crude combination, since the two rates aren't on a perfectly equivalent scale. But OPS became popular because it is easy to calculate and correlates strongly with overall offensive value. It remains a widely used shorthand despite more precise modern alternatives like wOBA (weighted on-base average).
OPS is best used as a quick, at-a-glance summary rather than a precise measurement. It means the most when compared to typical ranges for a given level and league, not treated as an absolute standard. Those ranges shift significantly between youth, high school, college, and pro competition. A hitter with a strong OPS is contributing in both key offensive ways: getting on base and hitting for extra bases. But the number alone doesn't say which of the two is driving the value.
Example
A hitter with a .380 on-base percentage and a .520 slugging percentage has an OPS of .900. That is a strong combined mark that reflects both getting on base often and hitting for real power.
Why it matters
OPS gives a quick, single-number read on overall offensive production. It is useful for comparing hitters or tracking a player's season-to-season progress without pulling apart every underlying stat.
Common mistakes
- Comparing a youth or high school player's OPS directly to Major League benchmarks without adjusting for the very different competition level and typical ranges at each level.
- Treating OPS as precisely weighted when it simply adds two rates together — wOBA is the more precisely weighted alternative for deeper analysis.
Frequently asked questions
What is considered a good OPS?
It depends heavily on level and competition — what counts as strong at the youth level is very different from high school, college, or pro baseball. Compare against typical ranges for the specific level rather than a single universal number.
Why is OPS more popular than wOBA even though wOBA is more precise?
OPS is simpler to calculate by hand and easier to explain. This made it the standard long before more precisely weighted metrics like wOBA became widely available.
Related terms
- Weighted On-Base Average (wOBA)Weighted On-Base Average (wOBA) gives each hitting outcome a run value. It combines walks and hits into one rate that is scaled like on-base percentage.
- Quality At-BatA quality at-bat is judged by process and competitiveness, not just outcome. A long count, a hard-hit ball, a walk, or moving a runner can count without a hit.
- Walk RateWalk rate (BB%) is the percentage of a hitter's plate appearances that end in a walk. An indicator of plate discipline, pitch recognition, and the ability to take advantage of a pitcher's wildness.
- Hard-Hit RateHard-hit rate is the percentage of batted balls struck above a set exit-velocity threshold — usually 95 mph in MLB, scaled lower for amateur levels. It measures contact quality independent of luck.
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