JavaScript Math.atan2()

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Example - atan2(y,x)

Assume you had a point with the (x,y) coordinates of (4,8), you could calculate the angle in radians between that point and the positive X axis as follows:

Math.atan2(8, 4);

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Description

The Math.atan2() method returns the arctangent of the quotient of its arguments, as a numeric value between PI and -PI radians.

The number returned represents the counterclockwise angle in radians (not degrees) between the positive X axis and the point (x, y).

Note: With atan2(), the y coordinate is passed as the first argument and the x coordinate is passed as the second argument.

JavaScript Tangent Methods:

The Math.tan() Method
The Math.tanh() Method
The Math.atan() Method
The Math.atan2() Method
The Math.atanh() Method

Sine and Cosine Methods:

The Math.sin() Method
The Math.cos() Method

Syntax

Math.atan2( y, x)

Parameters

Parameter	Description
y	Required. The y coordinate.
x	Required. The x coordinate.

Return Value

Type	Description
Number	PI to -PI. `NaN` if the values are empty or not numeric.

JavaScript Math

JavaScript Numbers

JavaScript Number Reference

Browser Support

Math.atan2() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes