Percentage Calculator using javascript

Question

I have the following values

x = 7.81;
y = 178.32;
z = (x/y)*100;

The percentage must be 4% for the above result. How can I calculate the percentage using JavaScript?

Answer 1

You pretty much have valid Javascript there, with the exception of the mixed case X (Javascript is case sensitive)

var x, y, z;

x=7.81;
y=178.32;
z=(x/y)*100;

console.log( z );

To get the result to two decimal places (2DP) you can use .toFixed() :

console.log( z.toFixed(2) );

Answer 2

var x = 7.81;
var y = 178.32;

var z = (x/y)*100;

z stores your percentage then.

Answer 3

Perhaps you're struggling with rounding:

var x = 7.81;
var y = 178.32;

alert( Math.round(x / y * 100) + '%' ); // 4%

Answer 4

Try this:

var a = 7.81;
var b = 178.32;
var c = a/b;

var result = c*100;

alert(result); 

Answer 5

var x,y,z;
x = 7.81;
y = 178.32;

z = (Number(x)/Number(y)) * 100;

console.log(z);
  (or)
alert(z);

Answer 6

You can create a function that you can use in different ways like below

function percentage(x, y)
{
    return (x / y) * 100;
}


console.log(percentage(7.81, 178.32) + '%');
console.log(percentage(7.81, 178.32).toFixed(2) + '%'); // rounded to 2 decimal places
console.log(percentage(7.81, 178.32).toFixed(0) + '%'); // rounded to integer

See fiddle for demo