What Is GAA in Hockey?

0.92. That is the lowest goals against average any NHL goalie has ever posted over a full season, set by George Hainsworth in 1928-29, and almost a century later nobody has come close. It is also the perfect trap, because GAA is the oldest and most-quoted goalie number in hockey, and it is the one that quietly lies to you. GAA in hockey measures goals per sixty minutes, a clean little number we will call the 60-Minute Yardstick, and the catch is that it grades the five skaters in front of the goalie almost as much as the goalie himself.

Goals against average is simple to compute and easy to misread. It answers one question, how many goals a goalie surrenders per full game of ice time, and then leaves out everything about how hard those goals were to stop. Here is exactly what GAA is, what it secretly excludes, why a great goalie can post an ugly one, and the record that will almost certainly never fall.

• The formula: goals against times 60, divided by minutes played, the goals a goalie allows per full game.
• The benchmark: under 2.50 is very good, under 2.00 over a full season is excellent.
• The catch: GAA depends on the team in front of the goalie, not just the goalie.
• The record: Hainsworth's 0.92 in 1928-29 is an artifact of a vanished era and is effectively unbreakable.

What GAA in hockey actually measures

The math is grade-school. Take the goals a goalie allows, multiply by 60, and divide by the minutes he played. A goalie who gives up 2 goals over a full 60-minute game has a 2.00 GAA. Give up 2 goals but only play 40 minutes and the rate climbs to 3.00, because GAA is a rate per sixty minutes, not a raw count. That is the whole 60-Minute Yardstick: it puts every goalie on the same per-game scale no matter how much they played.

What surprises people is what the number leaves out. Overtime counts, both the minutes and any goal. But two kinds of goals never touch a goalie's GAA at all.

Empty-net and shootout goals are not counted in a goaltender's goals against average; overtime goals and ice time are. (NHL scoring rules, goals against average)

The empty-net exclusion is the fair one: when a coach pulls the goalie for an extra attacker, the goalie is on the bench, so a goal into the open net is not his to wear. Shootout goals do not count either, because the shootout is a tiebreaker, not part of the run of play. So the 60-Minute Yardstick only measures what happens while the goalie is actually in his net, which sounds airtight until you realize what it still cannot separate.

Why GAA grades the team, not just the goalie

Here is the lie. GAA cannot tell the difference between a goalie and the team bleeding shots in front of him. Put an elite goalie behind a leaky defense that surrenders 38 high-danger chances a night and his GAA will look mediocre, even if he is the only reason the score is not 7-2. Put an average goalie behind a smothering checking team and his GAA will sparkle. The number rewards the sweater, not always the save.

That is why GAA has a smarter cousin: save percentage. Save percentage divides saves by shots faced, so it grades a goalie per shot instead of per game, and it cares a lot less about how many shots the team allows. An elite save percentage sits at .915 or higher. The two numbers usually agree, but when they fight, trust the save percentage, the same way you would trust a skater's underlying play over a raw plus-minus number that swings on his linemates.

The newest layer goes further still. Goals saved above expected, or GSAx, weighs the quality of every shot, so stopping a point-blank chance counts for more than a routine save from the boards. It is the stat that finally isolates the goalie from his defense. Think of the position itself, the most specialized job in the six on the ice, defended inside the crease and out to the trapezoid, and you see why one blunt number was never going to capture all of it.

Both numbers are measured on the same yardstick, yet they describe two different sports almost a hundred years apart, which is the whole story of why the record below cannot fall.

The GAA record that cannot fall

Hainsworth's 0.92 in 1928-29 came with 22 shutouts in a 44-game season for the Montreal Canadiens. Read that again: he shut out the opponent in half his starts. The catch is the era. Forward passing in the offensive zone was barely legal yet, scoring was strangled, and the league changed the passing rules the very next season, which sent goals soaring overnight. Hainsworth's record is not a goaltending feat you can chase so much as a fossil from a game that no longer exists.

That is why every modern goalie is really chasing 2.00, not 0.92. A sub-2.00 season today, against a league built to score, is the real-world ceiling of the 60-Minute Yardstick. The number on the page is the same; the world it is measured in is not.

From a GAA trophy to best goalie

For most of NHL history, GAA was not just a stat, it was an award. The Vezina Trophy originally went to the goalie or goalies on the team that allowed the fewest goals, which made it essentially a GAA prize. That changed in 1981-82. The Vezina became a vote by general managers for the best goalie overall, and a new award, the Jennings Trophy, took over the old job of honoring the fewest goals against. The league had effectively admitted that the lowest GAA and the best goalie are not always the same name, which is the entire argument of this article in trophy form.

You can still see it every spring in the Vezina race and in how teams pay for goaltending: a strong GAA helps a goalie's case and his next contract, like the deals at the heart of the goalie market, but no smart front office stops at the surface number. They check the save percentage, the workload, and how much of that shiny GAA was really the team. A goalie grinding through a brutal penalty kill all night will carry a worse GAA than one who never sees a 5-on-3, and the rate alone will never tell you which had the harder job, the same blind spot the goalie-interference debates expose about judging a crease from the box score.

The 60-Minute Yardstick, read right

GAA is the first goalie number you learn and the last one you should trust on its own. It is a clean rate, goals per sixty minutes, and as a quick gut-check it works fine: under 2.50 is good, under 2.00 is excellent, and 0.92 belongs to a dead era. But the moment it matters, who is actually the better goalie, the 60-Minute Yardstick hands the question to save percentage and GSAx and steps back. So quote GAA all you want at the bar. Just remember it is measuring the team as much as the man, and the next time a goalie's average looks ugly, ask how many shots he was facing before you blame him.

7 min read · ~1,300 words · Sources: NHL scoring rules, Hockey-Reference, NHL.com, The Hockey Writers

How we checked this: the GAA formula and its empty-net and shootout exclusions (overtime included) are verified against the published NHL scoring rules and the goals-against-average definition; the all-time single-season record (George Hainsworth, 0.92 GAA, 22 shutouts, 1928-29 Montreal Canadiens) is verified against Hockey-Reference and Hall of Fame records; the Vezina-to-Jennings change (1981-82) is verified against NHL trophy history.