OPS (On-base Plus Slugging) Calculator
OPS, short for on-base plus slugging, is a single baseball statistic that captures both how often a hitter reaches base and how much power they hit for. It is simply the sum of two rate stats: on-base percentage, which measures how often a batter reaches base, and slugging percentage, which measures total bases per at-bat. Adding them gives one number that correlates well with run production, which is why OPS became a popular shorthand for overall offensive value. This calculator adds your on-base percentage and slugging percentage and returns OPS to three decimal places, the convention for these rate stats. Enter an on-base percentage of .350 and a slugging percentage of .500 and the tool returns an OPS of .850. As a rough guide, an OPS around .800 is solid, above .900 is excellent, and the very best hitters push past 1.000 in strong seasons. Because the inputs are already-computed rate stats, the calculation is a clean addition, and you can change either input to see how reaching base more often or hitting for more power moves the combined figure. Every figure is computed deterministically from OPS equals on-base percentage plus slugging percentage, shown in full below with a worked example that reconciles exactly to the calculator above.
OPS adds two batting rate stats: OPS = OBP + SLG. An on-base percentage of .350 plus a slugging percentage of .500 gives an OPS of .850. Around .800 is solid and over .900 is excellent.
OPS formula
OPS = OBP + SLG
OBP = on-base percentage (times on base / plate appearances)
SLG = slugging percentage (total bases / at-bats)
OPS is the simple sum of on-base percentage and slugging percentage. Because both are already rates between zero and roughly one, the total is typically below 1.200 even for elite hitters.
Worked example
A hitter with an on-base percentage of .350 and a slugging percentage of .500.
- On-base percentage = 0.350
- Slugging percentage = 0.500
- OPS = 0.350 + 0.500
- OPS = 0.850
These are the calculator's default inputs, so the result above matches the widget exactly.
OPS (On-base Plus Slugging) Calculator: frequently asked questions
What is OPS in baseball?
OPS stands for on-base plus slugging. It is the sum of a hitter's on-base percentage and slugging percentage, giving one number that reflects both getting on base and hitting for power. It correlates well with run scoring.
What is a good OPS?
As a guide, an OPS near .700 is below average, around .800 is solid, above .900 is excellent, and over 1.000 is elite. League context matters, so compare against the season's average where possible.
Why add OBP and SLG when they have different denominators?
OBP uses plate appearances and SLG uses at-bats, so adding them is not mathematically pure, but the sum still tracks run production well and is easy to compute. That practical value is why OPS caught on despite the mismatch.
Is a higher OPS always better?
A higher OPS generally indicates a more productive hitter, but it does not capture baserunning, defense or situational hitting. Use it as one offensive summary among several rather than a complete rating of a player.
How precise should OPS be?
Rate stats like OBP, SLG and OPS are conventionally shown to three decimal places, for example .850. This calculator follows that convention so the result matches how the figure appears on scoreboards and stat lines.
Official sources
- Physical activity and health guidance: US Centers for Disease Control and Prevention (CDC). As at 25 June 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. This is general information, not financial, tax, legal or investment advice.