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JavaScript Math Rounding to a Decimal

Posted on 1998-09-02
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Last Modified: 2012-08-13
At URL below, I want to round the answer to 2 decimal places.

http://www.netafim-usa.com/calc/shrubclay.htm

Is this possible?

Thanks, April
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Question by:aprillougheed
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Expert Comment

by:martinag
ID: 1270150
Here's how I do:
i *= 100;
i = Math.round(i);
i /= 100;

Maybe there's some better way? I have no idea.

Martin
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Expert Comment

by:jbirk
ID: 1270151
martinag, why didn't you answer this one?  You provided a correct answer!
Of course those three statements can be conbined into one:
i= Math.round(i*100) / 100;

-Josh
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Accepted Solution

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martinag earned 200 total points
ID: 1270152
Was that really the easiest way?
Gosh!

Martin
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Expert Comment

by:jbirk
ID: 1270153
It's the only way that I have seen!
It's actually pretty simple as it is.  They probably figured it wasn't worth implementing a number of decimal places since it's so easy to get around it.
-Josh
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Author Comment

by:aprillougheed
ID: 1270154
I'm sure my question was understood.  I have a formula that returns a value like
4.44444444444
and I want it to return
4.44

How does the formula accomplish this?
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Expert Comment

by:jbirk
ID: 1270155
It translates 4.44444444444 to 444.444444444 by multiplying it by 100.  Then it rounds it normally to the nearest integer: 444, and then it divides by 100: 4.44

-josh
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Author Comment

by:aprillougheed
ID: 1270156
Thanks again Josh.

I really appreciate the extra explanation.


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Expert Comment

by:martinag
ID: 1270157
Note:
55.5555 * 100 = 5555.55

Math.round(5555.55) returns 5556
5556 / 100 = 55.56

Math.round() rounds down if the first decimal is 4 or below, up if it is five or higher.

Martin
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