mathjs/docs/reference/functions/ceil.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

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# Function ceil

Round a value towards plus infinity
If `x` is complex, both real and imaginary part are rounded towards plus infinity.
For matrices, the function is evaluated element wise.


## Syntax

```js
math.ceil(x)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | number &#124; BigNumber &#124; Fraction &#124; Complex &#124; Array &#124; Matrix | Number to be rounded

### Returns

Type | Description
---- | -----------
number &#124; BigNumber &#124; Fraction &#124; Complex &#124; Array &#124; Matrix | Rounded value


## Examples

```js
math.ceil(3.2);               // returns number 4
math.ceil(3.8);               // returns number 4
math.ceil(-4.2);              // returns number -4
math.ceil(-4.7);              // returns number -4

var c = math.complex(3.2, -2.7);
math.ceil(c);                 // returns Complex 4 - 2i

math.ceil([3.2, 3.8, -4.7]);  // returns Array [4, 4, -4]
```


## See also

[floor](floor.md),
[fix](fix.md),
[round](round.md)