What this calculator does
Find out how many goals a goalie lets in per full game. That number is the goals against average, or GAA. Goalies get pulled, come in as relief and play overtime. So it isn't just goals divided by games. It's goals divided by the minutes actually played, then scaled up to a 60-minute hockey game. A goalie who allows 2 goals in 30 minutes of relief has a GAA of 4.00 for that game.
Enter the goals against and the time played in minutes and seconds. You get the GAA per 60 minutes. You can also pick 90 minutes for a soccer goalkeeper, or any game length your league uses. The calculator also shows how many full games that time adds up to.
Where it's used
Why this math matters outside the classroom:
- Season goalie stats. A goalie who allows 52 goals in 1,845.5 minutes has a GAA of 52 × 60 ÷ 1,845.5, about 1.69.
- Relief appearances. A backup who allows 2 goals in 30 minutes has a GAA of 2 × 60 ÷ 30, which is 4.00 for that game.
- Soccer keepers. A keeper who concedes 20 goals in 1,800 minutes allows 20 × 90 ÷ 1,800, which is 1 goal per 90 minutes.
- Youth leagues. Coaches in leagues with three 15-minute periods set the game length to 45 to compare their goalies fairly.
- Unit rates in class. Students convert a total over many minutes into a rate per 60 minutes, the same skill as speed or price per unit.
Grade level and standards: Grade 6; Common Core State Standards for Mathematics 6.RP.A.3.b, 6.RP.A.2. © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
How to use it
- Enter the goals allowed while the goalie was in net.
- Enter the time played: minutes, plus any extra seconds.
- Choose 60 minutes for hockey, 90 for soccer, or enter your own game length.
- Read the goals against average and how many full games the time works out to.
What the inputs mean
- Goals against (GA)
- Goals scored against this goalie while they were on the ice. Two kinds don't count: empty-net goals scored after the goalie was pulled, and shootout goals.
- Minutes played
- Total time in net, including overtime. Season stats often list it as minutes:seconds, for example 1845:30.
- Average per
- Hockey GAA is always per 60 minutes, even in overtime games. Soccer's equivalent, goals conceded per 90, uses 90.
- Game length
- The normal length of one game in your league. For example, 45 for three 15-minute periods.
Formula and method
minutes played = minutes + seconds ÷ 60 GAA = GA × 60 ÷ minutes played full games = minutes played ÷ 60
GA is the goals against, and minutes played is the total time in net. GAA is a rate, like miles per hour. Multiply the goals by 60, then divide by the minutes. That gives goals per 60 minutes. So a goalie who played only part of a season is compared fairly with one who played every minute.
For another game length, swap 60 for that length. The result is then the goals allowed per full game of that length. Full games is the time played divided by the game length.
Worked example
A goalie has allowed 52 goals in 1,845 minutes and 30 seconds of play.
- Time played: 1,845 + 30 ÷ 60 = 1,845.5 minutes.
- GAA: 52 × 60 ÷ 1,845.5 = 3,120 ÷ 1,845.5 = 1.690599.
- Full games: 1,845.5 ÷ 60 = 30.758333.
Result: The goals against average is 1.69 over the equivalent of about 30.76 full games.
Understanding the result
In recent pro hockey seasons, a GAA under 2.50 has been very good, and one above 3.20 is poor. The league average moves as scoring rises and falls, though. So compare goalies from the same season.
GAA mixes the goalie's play with the team's defense. Picture two equally good goalies. One faces 35 shots a night and the other faces 25. The first will usually have a higher GAA. Save percentage (the share of shots the goalie stops) separates the two.
Assumptions and limitations
- Time on ice includes overtime. Goals are only the ones charged to this goalie.
- The game length is the normal, regulation length used to scale the rate (60 for hockey).
- GAA says nothing about the number or quality of shots faced.
- Very short appearances give extreme values. One goal in 30 seconds is a GAA of 120.
Frequently asked questions
Why not just divide goals by games played?
Goalies don't always play full games. Dividing by actual minutes, then scaling to 60, treats a relief appearance and an overtime game fairly. Dividing by games would make the GAA look worse for a goalie who was often pulled or brought in late.
Do empty-net goals count against the goalie?
No. Sometimes a team pulls its goalie to add an extra skater. A goal into the empty net then isn't charged to the goalie, and it doesn't count in their GAA.
Is a lower GAA always better?
Lower means fewer goals per game. But the goalie shares that credit with the defense in front of them. Read it alongside save percentage.
How does GAA compare with ERA in baseball?
They're the same idea. ERA (earned run average) scales a pitcher's earned runs to 9 innings. GAA scales goals to 60 minutes. Both turn a total into a per-game rate.
How this calculator is checked
Method: Standard goalie statistic: goals against × 60 ÷ minutes played (per 90 for soccer), with time on ice including overtime and empty-net goals excluded. The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-18. Found a problem? Tell us.
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