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The formula
GSAx = sum of xG on shots faced - goals against
Worked example
Shots faced by a goalie total 3.4 expected goals and he allows 2: GSAx = +1.4. Whatever the final score, he had a great night.
It is the fairest way to separate a goalie from his defense: a goalie bombarded with quality chances can allow 4 goals AND post a positive GSAx. RinkLog computes GSAx automatically from shot zones logged during the game, cumulative over the season.
RinkLog measures and computes all of this automatically during your hockey, ball hockey and ringette games.
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Frequently asked questions
What is GSAx in hockey?
GSAx (goals saved above expected) compares the goals a goalie actually allowed to the total expected goals (xG) of the shots faced. A positive GSAx means the goalie prevented goals the shot quality predicted; negative means they allowed more than expected.
Is a higher GSAx always better?
Yes, a higher (more positive) GSAx always means better goaltending relative to shot quality faced. A goalie can allow more goals in raw terms than another and still post a better GSAx if they faced tougher shots.
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Create my free accountOn the same topic
- What is HDSV% (high-danger save percentage)?HDSV% isolates saves on slot shots, the hardest ones: formula, example and why it judges a goalie better than overall SV%.
- What is a quality start for a goalie?A quality start measures whether a goalie gave his team a real chance to win: definition, threshold and why consistency beats highlights.
- How do you calculate save percentage (SV%) in hockey?How to calculate a hockey goalie's save percentage: the SV% formula, a worked example and the benchmarks to interpret it.
- How do you calculate goals against average (GAA)?How to calculate a hockey goalie's goals against average (GAA): formula, worked example and the limits of this statistic.
- What is a good save percentage for a goalie?A good save percentage is .910 in the NHL, around .900 in junior and .850 to .900 in youth hockey. Benchmarks by level and by age group.
