OBP = (Hits + BB + HBP) / (AB + BB + HBP + SF). Captures all plate appearances ending on base.
.330s is league average, .380+ is excellent, .400+ is elite among MLB.
High-OBP hitters create scoring chances and tend to bat at the top of the order.
OBP became a foundational metric post-Moneyball, valued for its tight correlation with team runs.