> ## Documentation Index
> Fetch the complete documentation index at: https://upstash-dx-3089.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# $avg

`$avg` computes the arithmetic mean of a field across matching documents.

If `missing` is provided, documents without the field are treated as if they had the `missing` value.

### Compatibility

| Field Type | Supported |
| - | - |
| TEXT | No |
| U64/I64/F64 | Yes |
| DATE | Yes |
| BOOL | Yes |
| KEYWORD | No |
| FACET | No |

Field must be `FAST`.

### Arguments

| Argument | Type | Required | Description |
| - | - | - | - |
| `field` | `string` | Yes | Field to aggregate. |
| `missing` | `number` | No | Fallback value for missing fields. |

<Tabs>
  <Tab title="TypeScript">
    ```ts theme={null}
    await index.aggregate({
      aggregations: {
        avg_price: { $avg: { field: "price", missing: 0 } },
      },
    });
    ```
  </Tab>

  <Tab title="Python">
    ```python theme={null}
    index.aggregate(
        aggregations={"avg_price": {"$avg": {"field": "price", "missing": 0}}}
    )
    ```
  </Tab>

  <Tab title="Redis CLI">
    ```bash theme={null}
    SEARCH.AGGREGATE products '{}' '{"avg_price": {"$avg": {"field": "price", "missing": 0}}}'
    ```
  </Tab>
</Tabs>

### Output

```json theme={null}
{ "avg_price": { "value": 40 } }
```

`value` is `null` when no values are available after filtering.


## Related topics

- [Aggregations](/redis/search/aggregations.md)
- [SEARCH.AGGREGATE](/redis/commands/search/search-aggregate.md)
- [$stats](/redis/search/aggregation-operators/metric-aggregations/stats.md)
- [Overview](/redis/search/aggregation-operators/metric-aggregations/overview.md)
- [ARINFO](/redis/commands/array/arinfo.md)