Gross Production Average (GPA) Calculator (Baseball)

LAST UPDATE: March 8th, 2020

Gross Production Average (GPA) Calculator

What is Gross Production Average?

GPA is a baseball metric that combines On Base Percentage (OBP) and Slugging Percentage (SLG) as an alternative to On Base Plus Slugging (OBPS).
GPA gives heavier weight to the On Base component of the combined two metrics compared with On Base Plus Slugging (OBPS).

How to calculate GPA

In Baseball, on GPA is calculated as follows:
GPA = ((1.8 x On Base Percentage) + Slugging Percentage) / 4


If a batter has an On Base Percentage of 0.394 and a Slugging Percentage of 0.455, then:
GPA = ((1.8 x 0.394) + 0.455) / 4
GPA = (0.709 + 0.455) / 4
GPA = 1.164 / 4
GPA = 0.291
This batter’s GPA would be 0.291.

What is On Base Percentage (OBP)?

On-base percentage is a metric that evaluates how often a batter gets on base for each time they are at bat.

What is Slugging Percentage?

Slugging percentage is a metric that evaluates the number of bases a batter achieves for each at bat.

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