Float sum with javascript

Question

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Is JavaScript's Math broken?

I'm calculating the sum of several float values using javascript and... I've noticed a strange thing never seen before. Executing this code:

parseFloat('2.3') + parseFloat('2.4')

I obtain 4.699999999999999

So... what sould I do to obtain a correct value? (supposed that this is incorrect...)

I am not saying this will help with this question. But I always like to point out [this article](http://www.codeproject.com/Articles/182416/A-Collection-of-JavaScript-Gotchas) in times like this — musefan, Sep 20 '12 at 10:50
While searching for this, I do not see how this question is duplicate - the problem is not solved on the question marked as duplicate, and still, in the whole SO, I have not found a proper solution for the same problem. — Malavos, Sep 04 '15 at 17:33

score 187 · Accepted Answer · answered Sep 20 '12 at 10:50

187

var result = parseFloat('2.3') + parseFloat('2.4');
alert(result.toFixed(2));

answered Sep 20 '12 at 10:50

Darin Dimitrov

11

Simply use `parseFloat((2.3 + 2.4).toFixed(10))` [Here](https://stackoverflow.com/a/51723472/4344976) is the explanation – Muhammad Musavi Aug 07 '18 at 09:36
5

Pay attention that `toFixed(fractionDigits)` returns a string – Artem Fedotov Sep 05 '20 at 09:21
this is not a real solutions whereas my numbers are different 1+1.2+1.25+4.5=??? – Monzur Sep 11 '21 at 11:04
@Monzur—you can do *toFixed* on the result: `Number((1+1.2+1.25+4.5).toFixed(10))` will return a number. If you need more than 10 decimal places you might need to use [*BigInt*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt) instead. – RobG Dec 28 '21 at 23:16

score 13 · Answer 2 · answered Sep 20 '12 at 10:58

13

(parseFloat('2.3') + parseFloat('2.4')).toFixed(1);

its going to give you solution i suppose

answered Sep 20 '12 at 10:58

2 Answers2