Math.ceil()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The Math.ceil() static method always rounds up and returns the smallest integer greater than or equal to a given number.

Try it

console.log(Math.ceil(0.95));
// Expected output: 1

console.log(Math.ceil(4));
// Expected output: 4

console.log(Math.ceil(7.004));
// Expected output: 8

console.log(Math.ceil(-7.004));
// Expected output: -7

Syntax

Math.ceil(x)

Parameters

x: A number.

Return value

The smallest integer greater than or equal to x. It's the same value as -Math.floor(-x).

Description

Because ceil() is a static method of Math, you always use it as Math.ceil(), rather than as a method of a Math object you created (Math is not a constructor).

Examples

Using Math.ceil()

Math.ceil(-Infinity); // -Infinity
Math.ceil(-7.004); // -7
Math.ceil(-4); // -4
Math.ceil(-0.95); // -0
Math.ceil(-0); // -0
Math.ceil(0); // 0
Math.ceil(0.95); // 1
Math.ceil(4); // 4
Math.ceil(7.004); // 8
Math.ceil(Infinity); // Infinity

Specifications

Specification
ECMAScript® 2026 Language Specification # sec-math.ceil

Browser compatibility

	Desktop					Mobile						Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	Deno	Node.js
`ceil`	1	12	1	3	1	18	4	10.1	1	1.0	4.4	1.0	0.10.0