⚾ On-Base Percentage (OBP) Calculator
Calculate OBP from hits, walks, HBP, at-bats and sacrifice flies.
OBP Formula
OBP Standards
.400+: Elite / .340-.399: Excellent / .310-.339: Average / Below .310: Poor
Worked examples
120 hits, 40 walks, 5 hit-by-pitch, 400 at-bats and 5 sac flies give (120 + 40 + 5) ÷ (400 + 40 + 5 + 5) = 165 ÷ 450 = .367.
The same batter with 20 more walks reaches 185 ÷ 470 = .394 without adding a single hit, which is why patience matters.
What the value assumes
OBP counts hits, walks and hit-by-pitch and divides by at-bats plus those three plus sacrifice flies, so it reflects how often a batter reaches base per plate appearance. Errors, fielder's choices and catcher's interference are excluded, which slightly understates the skill. Three decimals without a leading zero follow baseball convention, and small samples fluctuate a lot.
Frequently asked questions
- What counts as a good OBP?
- League average is about .320; .360 is above average, .390 excellent and .400 or better is elite. Career leaders sit near .480.
- Why prefer OBP to batting average?
- Batting average ignores walks, which reach base just as effectively as a hit. A patient .260 hitter can out-OBP a free-swinging .300 hitter.
- Does OBP include home runs?
- Yes, every hit counts, home runs included. Power is captured separately by slugging percentage, and OPS simply adds the two.