JavaScript (ES2026) reference · Math Methods and Constants

JavaScript Math.atan2() Method

Return the angle in radians between the positive x axis and the point (x, y). Note the argument order: y first.

JavaScript (ES2026) Since ES1

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Syntax

Math.atan2(y, x)

Parameter	Description
`y`	The y coordinate.
`x`	The x coordinate.

An angle between -π and π.

Angle of a pointTry it yourself

const toDeg = (r) => (r * 180) / Math.PI;
console.log(toDeg(Math.atan2(1, 1)), toDeg(Math.atan2(1, -1)));

Output

45 135

Direction in degrees, 0 to 359Try it yourself

const heading = (dx, dy) => (Math.round((Math.atan2(dy, dx) * 180) / Math.PI) + 360) % 360;
console.log(heading(0, 1), heading(-1, 0));

Output

90 180

Version	Change
JavaScript ES1	Added

Math.sin() · Return the sine of an angle given in radians. Convert degrees with deg * Math.PI / 180 first.
Math.cos() · Return the cosine of an angle given in radians. Convert degrees with deg * Math.PI / 180 first.
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