What xGA is
Expected Goals Against (xGA) is a metric that estimates the quality of the chances a team concedes. Where Expected Goals (xG) measures the chances a team creates, xGA measures the chances it gives up. It answers the question: based on the shots they allowed, how many goals *should* this team have conceded?
How it works
xGA is built the same way as xG, just from the defending team's perspective. Every shot a team faces is assigned a probability of being scored — based on distance, angle, body part, type of chance and more. Add up the xG of every shot a team concedes over a match or season, and you get their xGA. A team with a low xGA is allowing few and low-quality chances; a high xGA means they are giving up lots of good ones.
Why xGA is useful
- It measures defensive quality better than goals conceded. A team can concede few goals thanks to a hot goalkeeper or luck, while actually allowing many good chances — xGA reveals that.
- It predicts future performance. Over a large sample, xGA is a better guide to how a defence will perform going forward than the raw goals-conceded number.
- It separates the defence from the goalkeeper. If a team concedes far fewer goals than their xGA, it often means the goalkeeper is overperforming — useful for spotting unsustainable results in either direction.
xGA vs goals conceded
Goals conceded is what actually happened; xGA is what "should" have happened based on chance quality. The gap between them is revealing:
- Goals conceded well below xGA: the defence is riding good goalkeeping or luck, and may regress (concede more soon).
- Goals conceded well above xGA: the team is unlucky or has a poor goalkeeper, and may improve.
Used across a season, xGA gives a truer picture of defensive solidity than the scoreline alone.
The limits of xGA
Like all expected-goals models, xGA has caveats. It is noisy over small samples — a single match's xGA means little; it needs many games to be meaningful. It also doesn't capture everything a good defence does, such as preventing dangerous situations from becoming shots at all. A team that stops attacks before they reach a shot may have a low xGA precisely because of good defending that the metric can't directly see.
Related guides
Frequently asked questions
- What is xGA in football?
- Expected Goals Against (xGA) estimates the quality of chances a team concedes — the total expected-goals value of all the shots it allows.
- What is the difference between xG and xGA?
- xG measures the quality of chances a team creates; xGA measures the quality of chances it concedes. xGA is the defensive counterpart to xG.
- Is xGA better than goals conceded?
- For judging defensive quality, often yes. Goals conceded can be skewed by goalkeeping or luck, while xGA reflects the actual quality of chances allowed and predicts future performance better.
- What does it mean if a team concedes fewer goals than their xGA?
- It usually means the goalkeeper is overperforming or the team is riding luck, and the defence may concede more in future as results regress toward the xGA.
- What are the limits of xGA?
- It is unreliable over small samples and doesn't capture defending that prevents shots from happening at all, so a strong defence can post a low xGA that understates its work.