How to convert a number 30.006649999999994 to 30.01 in js?

Question

Anyone knows such a function in javascript?

Answer 1

num = 30.006649999999994;
result = num.toFixed(2); // result will equal 30.01

Here's a sample of this code over at JSBin

Answer 2

num = 30.006649999999994;
num2 = num.toFixed(2);

Answer 3

Just choose your desired accuracy and use a multiplication/division together with round function.

In your case, if you want to round to second decimal digit you could do

Math.round(value*100)/100

Answer 4

Use Number.toFixed(digitsAfterPoint).

See description here.

Answer 5

I always use my own round function for that.

function round(value, precision){                   
    if(precision){                                               
        var exponent = Math.pow(10, precision);                  
        return Math.round(value * exponent)/exponent;           
    }else{                                                       
        return Math.round(value);                               
    }                                                            
}                                                                

You can call it like this:

round(30.006649999999994, 2);

Answer 6

Rated up the answer by p.campbell, it doesn't look like I can comment on someone's answer yet.

But all you need to make that a number is add parseFloat();

num = 30.006649999999994; result = parseFloat(num.toFixed(2)); // result will equal 30.01