On-Base Plus Slugging (OPS)
Also known as: OPS
OPS is a hitting statistic calculated by adding on-base percentage and slugging percentage together, combining a hitter's ability to reach base with their ability to hit for power into a single 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, which is a mathematically crude combination — the two rates aren't on a perfectly equivalent scale — but it became popular because it is easy to calculate and correlates strongly with overall offensive value, which is why it remains a widely used shorthand despite more precise modern alternatives like wOBA.
OPS is best used as a quick, at-a-glance summary rather than a precise measurement, and it is most meaningful when compared to typical ranges for a given level and league rather than treated as an absolute standard, since those ranges shift significantly between youth, high school, college, and professional competition. A hitter with a strong OPS is contributing in both key offensive ways — getting on base and hitting for extra bases — even if 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 — 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, 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 professional 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, which made it the standard long before more precisely weighted metrics like wOBA became widely available.
Related terms
- Weighted On-Base Average (wOBA)wOBA is an advanced hitting metric that assigns a precisely researched run value to every type of offensive outcome — walk, single, double, triple, home run — and combines them into a single rate stat scaled to look like on-base percentage.
- Quality At-BatA quality at-bat is a plate appearance judged by the process and competitiveness of the at-bat rather than only by the outcome — working a long count, hitting the ball hard, advancing a runner, or drawing a walk can all count even if the hitter didn't get 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 — typically 95 mph in MLB, scaled lower for amateur levels. It measures contact quality independent of luck.
Related guides & benchmarks
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