OPS Calculator
On-base percentage, slugging percentage and their sum, OPS, from a batter’s line — hits by type, walks, hit-by-pitch, at-bats and sacrifice flies.
On-base percentage is how often a plate appearance ends on base: (H + BB + HBP) ÷ (AB + BB + HBP + SF).
How the ops calculator works
On-base percentage is how often a plate appearance ends on base: (H + BB + HBP) ÷ (AB + BB + HBP + SF). Slugging is total bases per at-bat, counting a single as one and a home run as four. OPS adds the two — a rough but useful measure of overall hitting, where .700 is average, .800 good, .900 excellent and 1.000 elite.
Formula: OBP = (H + BB + HBP) ÷ (AB + BB + HBP + SF); SLG = (1B + 2×2B + 3×3B + 4×HR) ÷ AB; OPS = OBP + SLG
Worked examples
| Inputs | OPS | Note |
|---|---|---|
| 150 hits, 30 2B, 3 3B, 25 HR, 60 BB in 500 AB | 0.899 | OPS .899 |
| Contact hitter: 180 hits, 25 2B, 5 HR, 30 BB | 0.78 | OPS .782 |
| Slugger: 130 hits, 40 HR, 90 BB | 0.885 | OPS .909 |
FAQFrequently asked questions
Why do walks count in OBP but not in slugging?
OBP measures avoiding outs — a walk does that. Slugging measures power per at-bat, and walks are not at-bats; that split is exactly why the two are added rather than one used alone.
Why do sacrifice flies count against OBP?
A sacrifice fly is a plate appearance that made an out, so it is in the denominator; sacrifice bunts are excluded as deliberate outs, one of OBP’s quirks.
What is a good OPS?
League average sits around .720–.750. Over .800 is a good regular, over .900 an All-Star season, and a full season over 1.000 is rare — a handful of hitters a year.
Is OPS the best measure?
It is easy and close: adding two rates with different denominators is crude, and OBP is worth more than slugging (about 1.8 times, by run value). wOBA and OPS+ refine it; OPS remains the everyday shorthand.
Where these figures come from
- World Handicap System — Rules of Handicapping — the score differential and handicap index formula
- International Cricket Council — Playing Conditions — over structure and run-rate definitions
- Major League Baseball — Official Rules — the published definitions for baseball statistics
Last checked: September 2026. Formulas follow the governing bodies where one publishes them — the World Handicap System for golf, the ICC playing conditions for cricket run rates.