---
title: ES|QL ATAN2 function
description: 
url: https://www.elastic.co/docs/reference/query-languages/esql/functions-operators/math-functions/atan2
products:
  - Elasticsearch
---

# ES|QL ATAN2 function
## Syntax

![Embedded](https://www.elastic.co/docs/reference/query-languages/esql/images/functions/atan2.svg)


## Parameters

<definitions>
  <definition term="y_coordinate">
    y coordinate. If `null`, the function returns `null`.
  </definition>
  <definition term="x_coordinate">
    x coordinate. If `null`, the function returns `null`.
  </definition>
</definitions>


## Description

The [angle](https://en.wikipedia.org/wiki/Atan2) between the positive x-axis and the ray from the origin to the point (x , y) in the Cartesian plane, expressed in radians.

## Supported types


| y_coordinate  | x_coordinate  | result |
|---------------|---------------|--------|
| double        | double        | double |
| double        | integer       | double |
| double        | long          | double |
| double        | unsigned_long | double |
| integer       | double        | double |
| integer       | integer       | double |
| integer       | long          | double |
| integer       | unsigned_long | double |
| long          | double        | double |
| long          | integer       | double |
| long          | long          | double |
| long          | unsigned_long | double |
| unsigned_long | double        | double |
| unsigned_long | integer       | double |
| unsigned_long | long          | double |
| unsigned_long | unsigned_long | double |


## Example

```esql
ROW y=12.9, x=.6
| EVAL atan2=ATAN2(y, x)
```


| y:double | x:double | atan2:double       |
|----------|----------|--------------------|
| 12.9     | 0.6      | 1.5243181954438936 |