On-Base Percentage
Calculate OBP (On-Base Percentage) for baseball using the official formula: (H + BB + HBP) / (AB + BB + HBP + SF). Compare to MLB benchmarks and build OPS with slugging.
MLB Examples — Click to Load
For educational and informational purposes only. Verify with a qualified professional.
Answer Capsule
OBP = (H + BB + HBP) / (AB + BB + HBP + SF). It measures how often a batter reaches base. Walks and HBP count as much as hits. A .400 OBP is elite; Barry Bonds' 2004 .609 is the all-time record.
Key Takeaways
- OBP correlates more strongly with run scoring than batting average.
- Walks and HBP are included in the numerator; sacrifice flies are in the denominator only.
- League average OBP is around .320-.340; .400+ is elite.
Did You Know?
How It Works
The numerator counts every way a batter reaches base: hits, walks, hit-by-pitches. The denominator counts every plate appearance that results in an official at-bat: at-bats, walks, HBP, and sacrifice flies. Sacrifice bunts are excluded.
Expert Tips
Combine with SLG
OPS (OBP + SLG) is a quick way to measure overall offensive value. Both are equally important.
Context Matters
League-average OBP varies by era. Compare to league context when evaluating historical players.
Walks Matter
Walks are undervalued in batting average but fully count in OBP.
Intentional Walks
Intentional walks are included in OBP calculations.
Comparison Table
| Tier | OBP Range |
|---|---|
| Elite | .400+ |
| Great | .370-.399 |
| Good | .350-.369 |
| Average | .320-.349 |
| Below Average | .300-.319 |
Infographic Stats
Official Sources
Disclaimer: OBP is a statistical measure. For official MLB records, consult Baseball Reference or FanGraphs.
OPS Builder Quick Reference
OPS = OBP + SLG. Combine your OBP with slugging for a quick offensive value metric. .800+ is good, 1.000+ is elite.