# ceil vs floor vs round

Written byPhuoc Nguyen

Category

JavaScript

Created

01 Sep, 2023

JavaScript provides three methods for rounding numbers:

``Math.ceil()``

, ``Math.floor()``

, and ``Math.round()``

. Each of these methods rounds numbers in a unique way. Let's explore them!## #Math.ceil()

The

``Math.ceil()``

method is used to round up a number to the nearest whole integer.For instance, if you have the number

``4.2``

, ``Math.ceil(4.2)``

will return ``5``

. Similarly, ``Math.ceil(-4.2)``

will return ``-4``

because ``-4``

is the smallest integer that is greater than ``-4.2``

.## #Math.floor()

The

``Math.floor()``

method is used to round a number down to the nearest whole integer.
Here's how it works: If you have the number ``4.2``

, ``Math.floor(4.2)``

will return ``4``

. ``Math.floor(-4.2)``

will return ``-5``

, because ``-5``

is the largest integer that is less than ``-4.2``

.## #Math.round()

The

``Math.round()``

method helps you round a number to the nearest whole integer. If the number has a fractional part that's less than ``0.5``

, it's rounded down; if it's ``0.5``

or greater, it's rounded up.For example, if you have the number

``4.2``

, ``Math.round(4.2)``

will give you ``4``

. Similarly, ``Math.round(4.5)``

will give you ``5``

. While ``Math.round(-4.5)``

will give you ``-4``

.## Questions? 🙋

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Phước Nguyễn