Baseball batting statistics measure how often a hitter gets on base, how much power they have, and how much they help their team score runs. Traditional numbers like batting average, home runs, and runs batted in are still widely used, but on-base percentage and slugging percentage, often combined into OPS, give a fuller picture of a hitter’s value. Advanced statistics such as isolated power, BABIP, wOBA, and wRC+ go further by weighting outcomes by their value and adjusting for ballparks and league conditions. Knowing what each stat measures, and what it leaves out, helps fans, players, and coaches evaluate hitters more accurately.
Rulebook note: official scoring rules, which define hits, errors, at-bats, sacrifices, and RBIs, are set by each governing body and applied by official scorers. Small differences exist between MLB and amateur levels. Advanced stat formulas also vary slightly between data providers.
Traditional stats
| Stat | Formula | Rough MLB benchmark |
|---|---|---|
| Batting average (AVG) | Hits divided by at-bats | Around .300 is excellent |
| On-base percentage (OBP) | (Hits + walks + hit by pitch) divided by (at-bats + walks + hit by pitch + sacrifice flies) | Around .370 or higher is excellent |
| Slugging percentage (SLG) | Total bases divided by at-bats | Around .500 or higher is excellent |
| OPS | OBP plus SLG | Around .900 or higher is excellent |
| Runs batted in (RBI) | Runs that score because of the batter’s action, with exceptions | Depends heavily on lineup position |
| Home runs (HR) | Count of home runs | Varies by era and league |
League averages change over time, so benchmarks are approximate. A statistic that looks strong in one era or league may be average in another.
What counts as an at-bat
Batting average and slugging use at-bats, not all plate appearances. Walks, hit-by-pitches, sacrifice bunts, sacrifice flies, and catcher’s interference do not count as at-bats. This is why a player can have many plate appearances but fewer at-bats. On-base percentage, by contrast, includes walks and hit-by-pitches, which is one reason many analysts prefer it to batting average for measuring how often a hitter avoids making an out.
Worked example
Imagine a hitter with 500 at-bats, 150 hits, 30 doubles, 3 triples, 25 home runs, 60 walks, 5 hit-by-pitches, and 5 sacrifice flies.
- Batting average: 150 divided by 500 equals .300.
- Total bases: singles are 150 minus 58 extra-base hits, or 92. Total bases equal 92 plus 60 for doubles, plus 9 for triples, plus 100 for home runs, or 261.
- Slugging: 261 divided by 500 equals .522.
- On-base percentage: (150 + 60 + 5) divided by (500 + 60 + 5 + 5), or 215 divided by 570, which is about .377.
- OPS: .377 plus .522 equals about .899.
Advanced stats
| Stat | What it measures | How to read it |
|---|---|---|
| ISO (isolated power) | Slugging minus batting average; raw extra-base power | Higher means more doubles, triples, and home runs |
| BABIP | Batting average on balls in play, excluding home runs and strikeouts | Unusually high or low values can signal luck or quality of contact |
| wOBA | Weights each way of reaching base by its average run value | Scaled similar to OBP; higher is better |
| wRC+ | Runs created, adjusted for park and league | 100 is league average; 150 is 50 percent better than average |
| OPS+ | OPS adjusted for park and league | 100 is league average |
| Strikeout and walk rates | Percentage of plate appearances ending in strikeouts or walks | Shows plate discipline and contact ability |
In the worked example above, ISO would be .522 minus .300, or .222, indicating solid power. BABIP is commonly calculated as hits minus home runs, divided by at-bats minus strikeouts minus home runs plus sacrifice flies, so it requires strikeout totals as well.
Why OBP and slugging matter
Batting average treats all hits equally and ignores walks. A single and a home run count the same, and a hitter who walks often gets no credit. OBP rewards avoiding outs, while slugging rewards extra-base power. Together, they capture the two biggest ways hitters create runs. Research by analysts over many years has shown that OBP and slugging relate more closely to team run scoring than batting average alone, which is why OPS and similar metrics became popular.
Contact and batted-ball data
Modern tracking technology adds measurements such as exit velocity, the speed of the ball off the bat, and launch angle, the vertical angle at which the ball leaves the bat. Stats like hard-hit rate and barrel rate describe how often a hitter makes strong contact. These metrics help explain why a hitter’s results may improve or decline and are increasingly used in college and professional player development.
Situational and split stats
Splits break a hitter’s numbers into specific situations. Common splits include performance against left-handed and right-handed pitchers, at home and on the road, with runners in scoring position, and in different counts. These can help coaches plan lineups and matchups, but small samples in narrow splits can be misleading. For example, a hitter’s average with runners in scoring position over a few dozen at-bats often reflects randomness more than a true skill difference. Splits are most useful when they are based on large samples or supported by scouting observations.
Stats in amateur baseball
High school and youth teams often track basic statistics such as batting average, on-base percentage, strikeouts, walks, and RBIs using scorebooks or apps. These numbers can help players and coaches spot trends, like a rising strikeout rate or improving plate discipline. However, amateur stats are affected by varying competition levels, field conditions, and scoring consistency, so they are best used as one tool among many. College recruiters generally combine stats with video, measurable skills, and in-person evaluation. Players who want to track their own progress can keep a simple log of plate appearances, results, and pitch types seen, which often reveals useful patterns over a season.
How to use batting stats
- Look at several stats together. No single number tells the full story.
- Consider sample size. A few weeks of games can be misleading; larger samples are more reliable.
- Adjust for context. Ballparks, leagues, and eras affect raw numbers, which is why park-adjusted stats exist.
- Compare to peers. Compare hitters with others at the same level and position.
- Watch the player too. Stats complement, rather than replace, scouting and observation.
Common mistakes
- Relying only on batting average. It ignores walks and power.
- Overvaluing RBI. RBIs depend heavily on teammates reaching base ahead of the hitter.
- Ignoring sample size. Short hot or cold streaks often regress toward a player’s true level.
- Comparing across eras without context. League-wide offense changes over time.
- Treating BABIP as pure luck. Hitters with strong contact and speed can sustain higher BABIPs.
- Confusing at-bats with plate appearances. Walks and sacrifices affect the two differently.
Frequently asked questions
What is a good OPS in baseball?
In MLB, an OPS around .800 is generally considered good and around .900 or higher excellent, though league averages vary by season and level.
Why don’t walks count in batting average?
Batting average only counts hits per at-bat, and walks are not counted as at-bats. On-base percentage includes walks to measure how often a hitter reaches base.
What does wRC+ mean?
It stands for weighted runs created plus. It estimates a hitter’s run creation, adjusted for ballpark and league, with 100 as league average.
