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JavaScript Math Rounding to a Decimal

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

martinag

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

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

Martin

jbirk

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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martinag

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jbirk

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

aprillougheed

ASKER

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?

jbirk

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

aprillougheed

ASKER

Thanks again Josh.

I really appreciate the extra explanation.

martinag

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