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# Avg Aggregation
> More info about avg aggregation is in the [official elasticsearch docs][1]
A single-value metrics aggregation that computes the average of numeric values that are extracted from the aggregated documents.
## Simple example
```JSON
{
"aggregations": {
"avg_grade": {
"avg": {
"field": "grade"
}
}
}
}
```
And now the query via DSL:
```php
$avgAggregation = new AvgAggregation('avg_grade');
$avgAggregation->setField('grade');
$search = new Search();
$search->addAggregation($avgAggregation);
$queryArray = $search->toArray();
```
[1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-avg-aggregation.html
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