What is Goals Against Average?
It is intended to give a measure of how many goals the goalie allows per unit of regulation game time.
It is considered one statics among a number of other ones, including win/loss ratio and save percentage that are used to help measure a goalie’s capability.
Goals Against Average = (goals against x game length) / minutes played.
32 goals against times 60 minute game length is 1,920.
1,920 divided by 637 minutes played is 3.01
Therefore, the goalie’s Goals Against Average (GAA) is is 3.01
What counts as a “Goal Against”?
If the goalie is not on the field of play at the time when the goals happens, a goal against the team does not cont against the goalie’s GAA.
Rules for what qualifies as a goal can be found in the Fina rulebook under method of scoring (other leagues with alternative rules may have different scoring regulations).
What counts as a “Minute Played”?
What is “Game Length”?
Olympic and FINA level water polo games have a game length of 32 minutes (4 periods of 8 minutes), while NCAA games have a length of 28 minutes. Other leagues exist with game lengths of 24 and 36 minutes.