Calculate OPS (on-base plus slugging) from at-bats, hits, extra-base hits, walks and HBP, or from OBP and SLG, with OBP, SLG and an OPS+ estimate.
OPS Formula
OPS = OBP + SLG
OBP = (H + BB + HBP) / (AB + BB + HBP + SF)
SLG = (1B + 2*2B + 3*3B + 4*HR) / AB
OPS+ = 100 * (OBP/lgOBP + SLG/lgSLG - 1)
- OPS is on-base plus slugging
- OBP is on-base percentage and SLG is slugging percentage
- H is hits, BB is walks, HBP is hit by pitch, AB is at-bats, SF is sacrifice flies
- 1B, 2B, 3B, and HR are singles, doubles, triples, and home runs, where 1B = H – 2B – 3B – HR
- The numerator of SLG is total bases (TB)
- lgOBP and lgSLG are the league-average OBP and SLG for the same season
The calculator has three modes. The batting stats mode takes raw totals (AB, H, 2B, 3B, HR, BB, HBP, SF), builds OBP and SLG from the first two formulas, and adds them to get OPS. It also reports batting average, singles, and total bases so you can check each step. The OBP and SLG mode adds two rates you already know, which is useful when reading a stat sheet. The league-only OPS+ estimate divides the player’s OBP and SLG by the entered league averages. An index of 100 matches those league rates. It excludes park adjustments and is not a direct percentage change in raw OPS. In batting totals mode, blank secondary totals mean zero; all counts must be whole numbers.
OPS Rating Scale and MLB League Averages by Season
The first table shows how an OPS is typically judged against major league standards.
| OPS | Rating |
|---|---|
| 1.000 or higher | Elite, MVP caliber |
| .900 to .999 | Excellent |
| .800 to .899 | Great |
| .750 to .799 | Above average |
| .700 to .749 | Roughly MLB average |
| .650 to .699 | Below average |
| Below .650 | Poor |
The second table lists approximate MLB league-wide averages over the last decade. These rounded historical figures may be entered as lgOBP and lgSLG in the league-only estimate; use verified matching rates for other leagues or seasons, and they also show why context matters: an .800 OPS meant more in 2022, when the league OPS was around .706, than in 2019, when it was around .758.
| Season | League OBP | League SLG | League OPS |
|---|---|---|---|
| 2015 | .317 | .405 | .721 |
| 2016 | .322 | .417 | .739 |
| 2017 | .324 | .426 | .750 |
| 2018 | .318 | .409 | .728 |
| 2019 | .323 | .435 | .758 |
| 2020 | .322 | .418 | .740 |
| 2021 | .317 | .411 | .728 |
| 2022 | .312 | .395 | .706 |
| 2023 | .320 | .414 | .734 |
| 2024 | .312 | .399 | .711 |
The 2020 season was shortened to 60 games, so its averages come from a much smaller sample than the other seasons.
Example Problems
Example 1: OPS from batting stats. A player finishes the season with 450 at-bats, 130 hits, 28 doubles, 3 triples, 22 home runs, 55 walks, 6 hit by pitches, and 4 sacrifice flies. First find singles: 130 – 28 – 3 – 22 = 77. Total bases are 77 + 2(28) + 3(3) + 4(22) = 230. OBP = (130 + 55 + 6) / (450 + 55 + 6 + 4) = 191 / 515 = .371. SLG = 230 / 450 = .511. OPS = .371 + .511 = .882, a great season by MLB standards.
Example 2: OPS+ for the same player. Using 2024 league averages (lgOBP = .312, lgSLG = .399): OPS+ = 100 x (.371/.312 + .511/.399 – 1) = 100 x (1.189 + 1.281 – 1) = 147. The league-only estimate rounds to 147. It omits park adjustments and does not mean raw OPS is 47% higher than league OPS. Use the unrounded batting ratios for the most precise estimate; these displayed inputs are rounded.
FAQ
What is a good OPS?
In the majors, anything above .800 is a strong season and above .900 is excellent; the league as a whole usually sits between .700 and .760. At lower levels the bar shifts up because pitching is weaker: good high school and youth players often post an OPS above 1.000, so judge the number against the level of competition rather than against MLB alone.
What is the difference between OPS and OPS+?
OPS is the raw sum of OBP and SLG, so it ignores the run environment of the season and ballpark. OPS+ rescales the number so that 100 is always league average, which lets you compare hitters across different seasons. The calculator’s OPS+ mode adjusts for the league averages you enter; the official MLB version also applies a ballpark adjustment, so published OPS+ figures can differ from the league-only estimate here. The difference is not guaranteed to be small.
Why do OBP and SLG use different denominators?
OBP measures how often a player avoids making an out per plate appearance, so its denominator adds walks, hit by pitches, and sacrifice flies to at-bats. SLG measures bases gained per official at-bat only, so walks and hit by pitches do not appear in it at all. This is also why OPS is only an approximation of offensive value: adding two rates with different denominators slightly undervalues getting on base, which is one reason stats like wOBA exist.
