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How to Calculate On-Base Percentage In Baseball

How to Calculate On-Base Percentage In Baseballthumbnail
An on-base percentage greater than .350 is considered excellent at the Major League level.

On-base percentage is a less-known but vitally important statistic in baseball. Just as it sounds, it measures the frequency with which a player gets on base, excluding the times he reaches on a fielding error. Unlike the better-known batting average, on-base percentage takes into account how much a player walks or gets hit by pitches. A good lead-off man will have a very high on-base percentage.

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    Difficulty:
    Moderate

    Instructions

      • 1

        Calculate the number of times the player has reached base safely. Add up the number of hits, bases on balls and hit-by-pitches. Note that a hit is not recorded when a player reaches on a fielding error or on a fielder's choice

      • 2

        Calculate the player's number of plate appearances. This is not to be confused with at-bats, which count only the number of times a player comes to bat that do not result in a walk, hit-by-pitch or sacrifice fly. Calculate plate appearances by adding at-bats, bases on balls, hit-by-pitches and sacrifice flies.

      • 3

        Divide total number of times the player has reached base safely by plate appearances. Round off to the third digit after the decimal. For example, if a player comes to bat five times and gets one hit, one walk and is out three times, his on-base percentage is 2/5 = .400.

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