How to calculate in javascript with %

Question

I've got some Excel formulas. Something like this:

13,7%/(33.3%/6.0%)*100%

How can I do this in Javascript?

Thanx in advance!

Freek

@pimvdb No it doesn't. 100+10% usually isn't evaluated to 100.1 but 110. Personally I don't like that kind of calculation at all and always switch to real numbers. — CodesInChaos
– CodesInChaos, Commented Mar 26, 2011 at 14:14
@CodeInChaos: My bad, but your example returns 10010.00% in Excel. — pimvdb
– pimvdb, Commented Mar 26, 2011 at 14:16
What I said was based on how my old calculator handled it. Excel seems to be even more strange. Just checked and my new calculator calculated it as 100.1. So it seems that adding percentages to real numbers is very dependent on the program. — CodesInChaos
– CodesInChaos, Commented Mar 26, 2011 at 14:18

Nathan Feger · Accepted Answer · 2011-03-26 14:13:26Z

4

just treat the numbers as decimals instead of percentages

var x = .137/(.333/.06)*100

Then format the result with a % to display it.

answered Mar 26, 2011 at 14:13

Nathan Feger

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2 Comments

peirix Over a year ago

Shouldn't that last number be 1, and not 100?

Nathan Feger Over a year ago

@pimvdb That comment made my day

Chris Sobolewski · Accepted Answer · 2011-03-26 14:14:28Z

1

Move the decimal point two places to the left.

answered Mar 26, 2011 at 14:14

Chris Sobolewski

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Comments

pimvdb · Accepted Answer · 2011-03-26 14:28:01Z

0

You could have a regexp replacing all occurences with /100.

var str = "13.7% + 50%/3%",
    regexp = /([0-9]*\.?[0-9]*)\%/;

while(regexp.test(str)) str = str.replace(regexp, "($1/100)")
// "(13.7/100) + (50/100)/(3/100)"

answered Mar 26, 2011 at 14:28

pimvdb

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