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
js
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()
js
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
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