On-base Percentage

The On-Base Percentage calculator computes the on-base percentage based on the number of hits, bases on balls, number time hit by pitch, number of at bats and number of sacrifice flies.

INSTRUCTIONS: Enter the following:

• (H) Number of hits
• (BB) Number of bases on balls
• (HBP) Number of hits by pitch 
• (AB) Number of at bats
• (SF) Number of sacrificed flies 

On-Base Percentage (OBP): The calculator returns the on-base percentage.

The Math / Science

The On-base Percentage is a measure of how often a batter reaches base for any reason other than a fielding error, fielder's choice, dropped/uncaught third strike, fielder's obstruction, or catcher's interference (the later two are ignored as either times-on-base or plate appearances in calculating OBP). The formula for On-base Percentage is : 

`OBP=(H+BB+HBP)/(AB+BB+HBP+SF)`

where:

• OBP = On-base Percentage 
• H = number of hits (times reached base because of a batted, fair ball without error by the defense)
• BB = number of bases on balls (also called a walk, hitter not swinging at four pitches called out of the strike zone and awarded first base)
• HBP = number of hits by pitch (times touched a pitch and awarded first base as a result)
• AB = number of at bats (Plate appearances, not including bases on balls, being hit by pitch, sacrifices, interference, or obstruction)
• SF = number of sacrificed flies (Fly ball hit to the outfield which although caught for an out, allow a baserunner to advance)

OBP is added to the to determine (OPS).

Baseball Stats Calculators

• Stolen Base Percentage
• On-base Percentage
• Slugging Percentage
• On-base Plus Slugging
• Times on Base
• Earned Run Average
• Batting Average
• Equivalent Average
• Defense-Independent Component ERA
• Fielding Independent Pitching
• Total Average
• Batting Average Against
• Range Factor
• Fielding Percentage
• Pythagorean Expectation
• Base Running Speed
• Bases per Plate Appearance

Baseball Base Separation:

• Major League Baseball Base Separation
• College Baseball Base Separation
• High School Baseball Base Separation
• Bronco League Base Separation
• Mustang League Base Separation
• Pinto League Base Separation
• Shetland League Separation
• Little League Base Separation

References

Wikipedia (https://en.wikipedia.org/wiki/On-base_percentage and https://en.wikipedia.org/wiki/Baseball_statistics)