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 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”?
Generally, 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.
In hockey, if the goalie is pulled from the net for an offensive player, and they are not on the ice at the time, a goal against the team would not count against that goalie’s GAA.
In soccer (football), if a goalie was acting as an offensive player but still on the field, a goal against the team would count against the goalie’s GAA.
Specific rules of when the goalie is “active” and “not active” depend on each sport and individual league and how statistics are recorded.
What counts as a “Minute Played”?
What is “Game Length”?
In Hockey, and NHL (National Hockey League) and IIHF (International Ice Hockey Federation) both operate 60 minute regulation time games. Junior league games often run a shorter amount of time (30, 36, and 45 minute games are not uncommon).
In Soccer (Football), regulation time at the international level is 90 minutes.
Field Hockey games are typically 70 minutes.
In Lacrosse, professional level games are 60 minutes of regulation time, although junior level leagues may run 48 minute regulation time games.
Water polo at the international level is 32 minutes of regulation time, junior leagues are often 24 or 28 minutes.