Goalie Gaa Calculator
Our hockey calculator computes goalie gaa+ instantly. Get accurate stats with historical comparisons and benchmarks.
Reviewed for accuracy by Sher, Sports Science & Nutrition Specialist
Goalie Gaa Calculator
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Formula: GAA+ = (League Average GAA / Goalie GAA) x 100
Worked example — GAA+ = 140.5 (Elite) | 34.8 goals saved above average
Formula
GAA+ = (League Average GAA / Goalie GAA) x 100
GAA+ expresses a goaltender Goals Against Average relative to the league average. A value of 100 means exactly average, above 100 is better than average. GSAA = (League Avg GAA - Goalie GAA) / 60 x Minutes Played.
Worked Examples
Example 1: Elite NHL Goaltender GAA+
Problem:A goaltender has a 2.15 GAA while the league average is 3.02. Calculate their GAA+ and goals saved above average over 2,400 minutes.
Solution:GAA+ = (League Avg GAA / Goalie GAA) x 100 GAA+ = (3.02 / 2.15) x 100 GAA+ = 1.4047 x 100 = 140.5 GSAA = (3.02 - 2.15) / 60 x 2400 GSAA = 0.87 / 60 x 2400 = 34.8 goals saved
Result:GAA+ = 140.5 (Elite) | 34.8 goals saved above average
Example 2: Average Goaltender Comparison
Problem:Goalie A has a 2.90 GAA in a league averaging 2.95. Goalie B has a 3.40 GAA in a league averaging 3.80.
Solution:Goalie A GAA+ = (2.95 / 2.90) x 100 = 101.7 Goalie B GAA+ = (3.80 / 3.40) x 100 = 111.8 Despite Goalie A having a lower raw GAA, Goalie B is performing better relative to their league.
Result:Goalie A GAA+ = 101.7 | Goalie B GAA+ = 111.8 (Goalie B is relatively better)
Frequently Asked Questions
What is GAA+ and how does it improve on standard GAA?
GAA+ (GAA Plus) is a league-adjusted version of Goals Against Average that expresses a goaltender performance relative to the league average. The formula is (League Average GAA / Goalie GAA) multiplied by 100, so a GAA+ of 110 means the goalie is 10% better than league average. This metric solves a major problem with raw GAA by accounting for the scoring environment of each era and league. A goaltender with a 2.80 GAA in a high-scoring era might actually be performing better than one with a 2.50 GAA in a low-scoring era, and GAA+ captures this distinction effectively.
How do you interpret GAA+ values and what numbers are considered good?
GAA+ uses 100 as the baseline, representing exactly league-average performance. Values above 100 indicate better-than-average goaltending, while values below 100 indicate worse-than-average performance. A GAA+ of 115 to 120 is considered excellent and typically places a goaltender among the top starters in the league. Elite Vezina Trophy contenders often post GAA+ values of 125 or higher during their best seasons. Values between 105 and 115 represent solid above-average goaltending, while 95 to 105 is roughly average. Below 90 generally indicates a goaltender who is struggling significantly compared to their peers.
Why is league-adjusted GAA better than raw GAA for comparing goalies?
League-adjusted GAA (GAA+) provides superior comparisons because the scoring environment in hockey changes dramatically over time and between leagues. In the 1980s, NHL goalies routinely had GAAs above 3.50, while in the early 2000s dead-puck era, even average goalies posted sub-2.50 GAAs. Raw GAA makes it impossible to compare Patrick Roy in 1986 to Carey Price in 2015 fairly. GAA+ normalizes for these differences by measuring each goalie relative to their own league average. This same principle applies when comparing goalies between the NHL, AHL, KHL, and other leagues that have different scoring rates.
What is goals saved above average and how is it calculated?
Goals Saved Above Average (GSAA) measures the total number of goals a goaltender has prevented compared to what a league-average goaltender would have allowed facing the same workload. The formula is: GSAA = (League Avg GAA - Goalie GAA) / 60 multiplied by Minutes Played. A positive GSAA means the goalie saved more goals than average, while a negative GSAA means they allowed more than expected. This cumulative metric rewards goalies who play more minutes while performing well, making it useful for evaluating a goaltender total impact over a season rather than just their rate statistics.
How does team defense affect GAA+ and how can you account for it?
Team defense significantly influences GAA+ because a goaltender behind a strong defensive team faces fewer and lower-quality shots, which naturally leads to a lower GAA and higher GAA+. Conversely, goalies on weak defensive teams face more shots from dangerous areas, inflating their GAA and deflating their GAA+. To account for this, analysts often combine GAA+ with other metrics like Goals Saved Above Expected (GSAx), which adjusts for shot quality using expected goals models. Some advanced models also use situation-adjusted GAA+ that focuses on even-strength play and removes empty-net goals from the calculation for a purer evaluation.
How many games should a goalie play before GAA+ becomes reliable?
GAA+ generally becomes a reliable indicator of goaltender quality after approximately 20 to 25 games or around 1,200 minutes of play. Before this threshold, the metric can be heavily influenced by a few exceptionally good or bad games. For example, a goalie who posts two shutouts in their first three starts might have an outstanding GAA+ that is unsustainable. Most statistical analyses of goaltender performance require a minimum of 1,000 minutes played to include a goalie in any rankings or comparisons. For full-season evaluations, having at least 40 starts provides the most stable and meaningful GAA+ readings.
Can GAA+ be used to compare goalies across different eras of hockey?
Yes, GAA+ is specifically designed to enable cross-era comparisons, which is one of its primary advantages over raw GAA. By expressing performance relative to the league average of each season, GAA+ puts all goalies on a level playing field regardless of when they played. A goaltender with a GAA+ of 120 in the 1985 season was performing at the same relative level as one with a GAA+ of 120 in the 2020 season, even though their raw GAA numbers would be very different. This makes GAA+ invaluable for historical analysis and discussions about the greatest goalies of all time.
How does GAA+ handle different game lengths and overtime situations?
GAA+ inherently handles different game lengths because both the goalie GAA and the league average GAA are calculated using the same regulation game length as the denominator. In the NHL where games are 60 minutes of regulation, both figures use 60 minutes as the standard. Overtime goals and minutes are included in both calculations, so they affect the goalie and league average proportionally. However, some analysts prefer to calculate GAA+ using only regulation time to remove the influence of overtime, which tends to be more open and higher-scoring than regulation play. The standard calculation includes all game situations.
What is the relationship between GAA+ and other adjusted goaltending metrics?
GAA+ belongs to a family of league-adjusted statistics that includes Save Percentage Plus (SV%+), Quality Starts Percentage, and Goals Saved Above Expected (GSAx). While GAA+ adjusts raw GAA for the league scoring environment, SV%+ does the same for save percentage. GSAx goes further by incorporating expected goals models based on shot location, shot type, and game situation. These metrics complement each other because GAA+ captures the overall defensive result, SV%+ isolates shot-stopping ability, and GSAx measures performance against shot quality. Together, they provide a comprehensive picture of goaltender value.
How do you calculate GAA+ when a goaltender plays in multiple leagues?
When a goaltender plays in multiple leagues during the same season, such as splitting time between the NHL and AHL, the best practice is to calculate separate GAA+ values for each league using that league own average GAA. Combining the numbers would be misleading because the scoring environments differ substantially. An AHL goalie with a 2.80 GAA might have a GAA+ of 108 in the AHL context but would need a much lower raw GAA to achieve the same GAA+ in the NHL. Some prospect evaluation systems weight the separate GAA+ values based on minutes played in each league to create a composite evaluation score for developmental purposes.
References
Reviewed for accuracy by Sher, Sports Science & Nutrition Specialist · Editorial policy
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