On Base Percentage Calculator (OBP)
Use our on base percentage calculator to calculate OBP from hits, bases on balls, hit by pitch, at-bats, and sacrifice flies. Includes the on base percentage formula, an example OBP calculation, and tips for calculating OBP in Excel.
What Is On Base Percentage?
On base percentage (OBP) measures how often a hitter reaches base per plate appearance using hits, walks, and hit-by-pitch.
OBP is often considered a strong indicator of offensive value because it captures reaching base in multiple ways, not just hits.
This calculator uses the standard OBP formula with hits (H), bases on balls (BB), hit by pitch (HBP), at-bats (AB), and sacrifice flies (SF).
On Base Percentage Formula
OBP is the sum of ways a player can reach base divided by the relevant plate appearance components used in the OBP definition.
This is the common OBP formula used in baseball stats.
OBP is typically shown as a decimal (example: .385).
How to Calculate On Base Percentage
- 1
Enter hits (H).
- 2
Enter bases on balls (BB).
- 3
Enter hit by pitch (HBP).
- 4
Enter at-bats (AB).
Frequently Asked Questions
Use OBP = (H + BB + HBP) ÷ (AB + BB + HBP + SF).
It depends on level and era, but higher OBP generally indicates a better ability to reach base. Comparing players within the same league and season is the fairest benchmark.
Averages vary by league and season. To compare fairly, look at league-average OBP for the specific level and year you’re analyzing.
Use the OBP formula with cell references. For example: =(A2+B2+C2)/(D2+B2+C2+E2) where A2=H, B2=BB, C2=HBP, D2=AB, E2=SF.
Sacrifice flies count as plate appearances where the batter made an out, so they are included in the OBP denominator in the standard definition.