How can I round a decimal up to the nth decimal?

Question

In JavaScript, I would like to round a given number (x) up based on another decimal (y). For example:

x = 8.6333
y = 0.5
result = 9

x = 8.6333
y = 0.2
result = 8.8

x = 8.6333
y = 0.1
result = 8.7

How would I go about doing this?

possible duplicate of [Gaussian/Banker's Rounding in Javascript](http://stackoverflow.com/questions/3108986/gaussian-bankers-rounding-in-javascript) — Diodeus - James MacFarlane, Jun 05 '12 at 15:58

score 3 · Accepted Answer · answered Jun 05 '12 at 15:59

3

Divide x by the y. Round that up, and multiply by y again.

var answer = Math.ceil(x/y)*y;

answered Jun 05 '12 at 15:59

Rene Pot

Great! A friend of mine just provided the same answer and it makes sense now! Thank you – Kyle Hayes Jun 05 '12 at 16:02
1

Mathematically, that should work. But in "real life", it might not. For an explanation, read: http://stackoverflow.com/questions/588004/ – Robert Lozyniak Dec 19 '16 at 20:05

1 Answers1