JavaScript (ES2026) reference · Math Methods and Constants

JavaScript Math.cos() Method

Return the cosine of an angle given in radians. Convert degrees with deg * Math.PI / 180 first.

JavaScript (ES2026) Since ES1

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Syntax

Math.cos(x)

Parameter	Description
`x`	An angle in radians.

A number between -1 and 1.

Cosine valuesTry it yourself

console.log(Math.cos(0), Math.cos(Math.PI));

Output

1 -1

Cosine of 60 degreesTry it yourself

const deg = 60;
console.log(Math.cos((deg * Math.PI) / 180).toFixed(2));

Output

0.50

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.atan2() · Return the angle in radians between the positive x axis and the point (x, y). Note the argument order: y first.
JavaScript Math · tutorial
JavaScript Numbers · tutorial