# ceil vs floor vs round

Written byPhuoc Nguyen

Created

01 Sep, 2023

Category

JavaScript

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? 🙋

Do you have any questions about front-end development? If so, feel free to create a new issue on GitHub using the button below. I'm happy to help with any topic you'd like to learn more about, even beyond what's covered in this post.

While I have a long list of upcoming topics, I'm always eager to prioritize your questions and ideas for future content. Let's learn and grow together! Sharing knowledge is the best way to elevate ourselves 🥷.

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Phước Nguyễn