How is a goaltender's gaa calculated?

Answer 1

You need two numbers for the calculation - the number of minutes a goalie has played, and the number of goals they've allowed. From there, you use this formula:

GA (goals against) / Minutes played * 60

The "60" is used as the multiplier, because that's the number of minutes used in a "full" game.

Using Hasek as an example this year, the calculation would be:

23 (goals he's allowed) / 782 (minutes he's played) * 60

That gives you 1.764, which is rounded to 1.76, the top average in the league.

Answer 2

the goals against average is how many goals per game a goalie lets in. most of the time, it reflects how good the team is and not necessarily the goalie.
so, now with the math....it is 'goals against' per 'game', so....
simply divide the number of goals allowed by the number of games played (eg. 37 goals allowed in 11 games is 37 divided by 11 = 3.36).

for more accurate stats, divide the minutes played by 60 to achieve exact games, then divide goals by exact games.