# How to ceil a number to 16 decimals in JavaScript

## The Easy Way

A common use-case of our beloved front-end language, **JavaScript**, is to ceil a given number. In this short tutorial we will explore how
to do this exactly, in an easy yet keeping the *precision*.

Imagine we fetch the number below from an API, whether it is first- or third-party is not important in this case.

In this case we have gotten the number above, which has
**18 decimals**, but as we very much love to
better the user-experience (*UX*), and actually make the number more
understandable, we would like to *ceil* to
**16 decimals** instead.

## Hick-ups

Yes, it is actually that easy! Although, sometimes we don't care if the number
does up or down, thus using the `Math.round()`

-function is quite handy
as well. We could simply switch the *ceil* for our beloved
*round*, alas, sadly with some numbers, we end up rounding wrong this is
not something we will go into details with, but you can read more
here if you
are curious.

The *TL;DR* is that you can simply add
Epsilon to the original number, before we do anything else with it. The snippet is written
as below.

In our case it doesn't matter as we *ceil*, but if you read
through the stack-overflow question from earlier, you will get some ideas on when
and why to use it. Always remember though, **JavaScript** can be a funny
thing to mess with.