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JavaScript Math atan2() Method

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

Definition and Usage

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
NumberPI to -PI.
NaN if the values are empty or not numeric.

Related Pages:

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 IE Edge Firefox Safari Opera
Yes Yes Yes Yes Yes Yes

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