JavaScript rounding numbers

Question

I know that I can round a number like this

var number = 1.3; Math.round(number);

and the result I'm given is 1.

But how can I round a number to the next highest whole number? So round 1.3 to 2 instead of 1?

also note that Math.round doesn't round down, it rounds to the nearest integer. — Gabi Purcaru
– Gabi Purcaru, Commented Dec 21, 2010 at 16:02

Gabi Purcaru · Accepted Answer · 2010-12-21 16:07:18Z

7

Use Math.ceil() instead. It rounds the number up.

edited Dec 21, 2010 at 16:07

Gabi Purcaru

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answered Dec 21, 2010 at 16:02

simshaun

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Jon · Accepted Answer · 2010-12-21 16:02:18Z

var rounded = Math.ceil(number);

As an aside, in platforms with no ceil method available, and assuming round rounds to the nearest integer, a common trick used to round upwards is:

var rounded = Math.round(number + 0.5);

Community · Accepted Answer · 2017-05-23 11:55:28Z

Don't forget Math.floor(number)!

Although, I would recommend against using javascript to do arithmetic... I don't know the exact reasons (but i just asked a question =P).

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