Batting average is the oldest and most recognizable hitting statistic in baseball, dating to 1872 when it was first published by Henry Chadwick. It remains useful as a quick hitting summary but has been steadily supplemented by more complete metrics — on-base percentage, slugging, OPS, and increasingly wOBA and wRC+ — that better capture the value of walks, power, and park context. The sections below explain how BA is actually computed, why OBP and SLG usually matter more, and how to read modern hitters in an era when a .240 BA can be a star-level performance.
What Batting Average Actually Measures
Batting average is simply hits divided by at-bats, and the subtlety lives in what counts as an at-bat. Walks, hit-by-pitches, sacrifice flies, sacrifice bunts, and catcher's interference all do not count as at-bats — they are plate appearances that don't end in an AB outcome. This is why a patient walker with a .260 BA can have a .380 OBP, while a free-swinger with a .280 BA might have only a .310 OBP. Batting average also makes no distinction between types of hits: a bunt single and a home run both add one hit to both sides of the ratio. This equal weighting is exactly what slugging percentage was designed to correct, by crediting doubles with 2 bases, triples with 3, and home runs with 4. Understanding what BA excludes (walks) and what it equal-weights (singles vs homers) is the foundation for interpreting a hitter's full offensive profile rather than just the headline number. League-wide, the MLB average has hovered between .240 and .270 for most of the past century, with era effects (dead ball, pre-integration, steroid era, modern analytics era) driving most of the movement.
Why OBP and SLG Usually Tell a Better Story
On-base percentage and slugging are the two metrics that supplement BA in the modern slash line (BA/OBP/SLG), and for most analytical purposes they are more useful individually than BA itself. On-base percentage adds walks and hit-by-pitches to the numerator and denominator, producing a more complete measure of how often a hitter reaches base. OBP correlates more strongly with runs scored than BA does, which is why front offices have increasingly emphasized on-base skills since Moneyball popularized the insight in the early 2000s. Slugging captures power by crediting extra-base hits proportionally. OPS (on-base plus slugging) is the simplest single-number summary that combines both, and it correlates quite well with team run scoring despite being mathematically imperfect (OBP and SLG are measured on different denominators). A hitter with a .310/.400/.500 line is almost always more valuable than a hitter with a .320/.330/.410 line despite the second player having the "better" batting average, because the first reaches base more often and hits for more power per contact. For most evaluations, OBP and SLG deserve more weight than BA, and the triple slash should be read as a whole.
Reading Modern Hitters
The modern game produces batting averages roughly 20–30 points lower than those of the 1990s and early 2000s, driven by several structural changes that make BA a less reliable headline metric than it used to be. Strikeout rates have climbed from roughly 15% to 23% league-wide as hitters trade contact for power and pitchers throw harder with more sophisticated breaking stuff. Defensive shifting — now more selectively permitted after 2023 rule changes — reduced BABIP on pulled ground balls for years. Analytics-driven launch angle training prioritizes flyball contact over line drives, which raises home-run totals but lowers batting averages because fly balls in play become outs more often than line drives do. The result is an era where a .240 hitter with 40 home runs and a .350 OBP (an .810 OPS) is a star-level performer, while a .300 hitter with no power and a .330 OBP may be a below-average contributor. When reading modern hitters, anchor on OPS or OPS+ first, treat BA as context, and remember that a .250 season in 2024 is what a .275 season looked like in 1999. The .400 barrier likely cannot be broken in today's environment — Ted Williams's .406 in 1941 remains the modern high-water mark, and the combination of relief pitching, night games, and analytics-driven defense makes it essentially unreachable.