By Zencalcy Editorial TeamLast reviewed About us
OPS adds on-base percentage and slugging percentage into a single number. It is a quick summary of a hitter's ability to reach base and hit for power, even though adding two rates with different scales is a shortcut.
Add on-base percentage and slugging into one summary.
OPS = OBP + SLG Counting mode: H = 1B + 2B + 3B + HR TB = 1B + 2×2B + 3×3B + 4×HR OBP = (H + BB + HBP) ÷ (AB + BB + HBP + SF) SLG = TB ÷ AB
OPS is descriptive, not a true percentage. It adds two rates that are scaled differently, so it is best used to compare hitters rather than to interpret as a probability.
| Symbol | Meaning |
|---|---|
| OBP | On-base percentage as a decimal, such as 0.350. |
| SLG | Slugging percentage as a decimal, such as 0.450. |
| 1B | Singles, worth one total base. |
| 2B | Doubles, worth two total bases. |
| 3B | Triples, worth three total bases. |
| HR | Home runs, worth four total bases. |
| BB | Walks, which count as a time on base. |
| HBP | Hit-by-pitch, which also counts as a time on base. |
| AB | At-bats, used in both the OBP denominator and the SLG denominator. |
| SF | Sacrifice flies, which add to the OBP denominator. |
0.350 + 0.450 = 0.800 OPS. From counting stats, 20 singles, 8 doubles, 2 triples, 5 home runs, 12 walks, 3 hit-by-pitch, 150 at-bats, and 2 sacrifice flies give an OBP of 0.299 and a SLG of 0.413, for an OPS of 0.713.
OPS is simply on base percentage plus slugging percentage. Because OBP is a rate of reaching base and slugging is bases per at bat, the sum mixes two different scales, but it has become a popular shorthand for overall offensive production. A player with a .350 OBP and a .450 slugging mark posts an OPS of .800.
The convenience comes at a cost. Adding the two double counts hits, since every hit appears in both components, and it implicitly weights OBP and slugging equally even though reaching base is generally the more valuable event per unit.
Rough bands are often used to describe OPS, with something near .700 seen as modest, .750 to .800 as solid, and above .900 as excellent, though league context matters. Because it is a sum and not a true run estimator, OPS can rank hitters slightly out of order compared with weighted measures, but it remains easy to compute and compare.
Continue with the Runs Created Calculator, Slugging Percentage Calculator, or the Strikeout to Walk Ratio Calculator — or browse more baseball tools and all sports calculators.
Many people treat 0.800 as a strong marker, but league levels vary by era and level of play. Compare a hitter with peers in the same context rather than against one fixed number.
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Last reviewed: September 2026. See how we build and check every tool on the about page.
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Content updated: September 2026