Goals Against Average Calculator & How It Works

This calculator works out a goaltender’s goals against average (GAA) by dividing the number of goals allowed by the minutes played, then multiplying by 60 (or the regulation game length). You enter goals allowed, minutes played, and optionally the game length, and it returns the GAA rounded to two decimal places, plus the equivalent goals per full game. GAA is the standard stat for comparing goalies across different ice hockey leagues and eras.

Formula

The goals against average formula is:

GAA = (Goals Allowed ÷ Minutes Played) × Game Length

Where:

• Goals Allowed – total goals scored against the goalie while they are on the ice (excluding empty-net goals and shootout goals).
• Minutes Played – the exact number of minutes the goalie was on the ice, including overtime.
• Game Length – the regulation length of a game, usually 60 minutes in the NHL, 60 in international play, and 60 in most professional leagues. Some leagues use different lengths (e.g., 50 minutes in some youth or European leagues).

The result is expressed as goals per full game. For example, a GAA of 2.50 means the goalie allows 2.5 goals per 60-minute game on average.

Worked Example

Using the default values from the calculator:

• Goals allowed = 3
• Minutes played = 60
• Game length = 60 minutes

Step 1: Divide goals by minutes: 3 ÷ 60 = 0.05 goals per minute.

Step 2: Multiply by game length: 0.05 × 60 = 3.00 GAA.

So the GAA is 3.00. That means the goalie allows exactly 3 goals per full game.

The second output, goals per 60 minutes, is the same when game length is 60. If you set game length to 50, the GAA would be 2.50, but goals per 60 would still be 3.00.

Why GAA Is Used

GAA has been the primary goaltending statistic for decades because it is simple and intuitive. It tells you how many goals a goalie gives up on average over a full game, which is easy for fans and coaches to understand. It allows comparison across goalies who have played different numbers of games and different minutes.

However, GAA does not account for the number of shots faced. A goalie facing 40 shots and allowing 2 goals has a GAA of 2.00, same as a goalie facing 15 shots and allowing 2 goals. That is why save percentage and goals saved above average are also used.

How to Read the Result

A lower GAA is better. In the NHL, a GAA around 2.00–2.50 is considered excellent, while 3.00–3.50 is average, and above 4.00 is poor. In lower-scoring leagues, these numbers shift. Always compare GAA within the same league and era, because scoring levels vary.

GAA is also affected by team defense. A goalie on a strong defensive team will naturally have a lower GAA than an equally skilled goalie on a weak team. So GAA measures the goalie plus the team’s defensive performance, not just the goalie alone.

Common Mistakes and Limits

• Forgetting to convert partial minutes: If a goalie plays 59 minutes and 30 seconds, that is 59.5 minutes, not 59. Convert seconds to decimal minutes before calculating.
• Using goals per 60 instead of game length: Some leagues have 50-minute games. Always use the correct game length for that league.
• Including empty-net goals: Official GAA excludes empty-net goals and shootout goals. Only count goals scored while the goalie is on the ice.
• Rounding too early: Keep full precision until the final step. Round only the final GAA to two decimals.

The formula assumes a constant rate of goals against over time. In reality, a goalie might allow goals in bursts, but over a full season the average smooths out.

GAA vs. Save Percentage

Save percentage (SV%) is the number of saves divided by shots on goal. It is not affected by the number of shots faced, so it better isolates the goalie’s individual performance. GAA is heavily influenced by shot volume. A goalie facing 35 shots and allowing 2 goals has a .943 SV% and a 2.00 GAA. A goalie facing 20 shots and allowing 1 goal has a .950 SV% and a 1.00 GAA. The second goalie has a lower GAA but the save percentages are similar.

Most analysts use both stats together. GAA gives a quick sense of scoring impact, while SV% gives a fairer comparison of goalie skill.

Frequently Asked Questions

What is a good goals against average?

It depends on the league and era. In the NHL, a GAA below 2.50 is above average, below 2.00 is elite, and above 3.50 is below average. In junior or European leagues, scoring may be higher, so adjust your expectations.

Does GAA include empty net goals?

No. Official GAA excludes empty-net goals, shootout goals, and goals scored when the goalie is pulled for an extra attacker. Only goals allowed while the goalie is on the ice count.

How do I calculate GAA for a goalie who played only 20 minutes?

Use the same formula. For example, if a goalie allows 1 goal in 20 minutes, GAA = (1 ÷ 20) × 60 = 3.00. The formula scales the rate to a full game.

Why is GAA sometimes shown with three decimal places?

Some stat sites display GAA to three decimals for finer ranking. The traditional standard is two decimals, but three gives a more precise tie-breaker. The calculator rounds to two by default.

Can GAA be negative?

No. Goals allowed and minutes played are always non-negative, so GAA is always zero or positive. A goalie with a 0.00 GAA has not allowed any goals.

What is the difference between GAA and goals per 60?

They are the same when the game length is 60 minutes. If the game length is different (e.g., 50 minutes in some leagues), GAA is scaled to that length, while goals per 60 is always per 60 minutes.

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in goals | Goals allowed | - | 3 | 0
in min | Minutes played | min | 60 | 0
in glen | Game length | min | 60 | 0
out gaa | Goals against average | goals/game | (goals / min) * glen | 2
out gp | Goals per 60 min | goals/60 | (goals / min) * 60 | 2