operators - How can I round to whole numbers in JavaScript? - Stack Overflow

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I have the following code to calculate a certain percentage:

var x = 6.5;
var total;

total = x/15*100;

// Result  43.3333333333

What I want to have as a result is the exact number 43 and if the total is 43.5 it should be rounded to 44

Is there way to do this in JavaScript?

I have the following code to calculate a certain percentage:

var x = 6.5;
var total;

total = x/15*100;

// Result  43.3333333333

What I want to have as a result is the exact number 43 and if the total is 43.5 it should be rounded to 44

Is there way to do this in JavaScript?

• javascript
• operators
• rounding

Share Improve this question Follow edited Oct 29, 2014 at 19:42 John Washam 4,10344 gold badges3434 silver badges4646 bronze badges asked Aug 6, 2011 at 16:07 idontknowhowidontknowhow 1,52755 gold badges1717 silver badges2323 bronze badges

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5 Answers 5

Sorted by: Reset to default 187

Use the Math.round() function to round the result to the nearest integer.

//method 1
Math.ceil(); // rounds up
Math.floor(); // rounds down
Math.round(); // does method 2 in 1 call

//method 2
var number = 1.5; //float
var a = parseInt(number); // to int
number -= a; // get numbers on right of decimal

if(number < 0.5) // if less than round down
    round_down();
else // round up if more than
    round_up();

either one or a combination will solve your question

total = Math.round(total);

Should do it.

Use Math.round to round the number to the nearest integer:

total = Math.round(x/15*100);

a very succinct solution for rounding a float x:

x = 0|x+0.5

or if you just want to floor your float

x = 0|x

this is a bitwise or with int 0, which drops all the values after the decimal

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