How can I get width in percentage which I have given in percentage in CSS class using jquery

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jQuery

CSS3

Hi.. I have one css class which is ".xyz" . In this class i have setup width property in "%". So my code is
.xyz {width:3%}
I want the same width which is in percentage using jquery.I have tried following ways so far.
Is there any way by which i can directly get the same width which i have setup.

Let me be more clear about output: I want width in output which is 3%.

What I have tried:

1.
var f1 = $(".xyz").width() / $('.xyz').parent().width() * 100;
alert(f1);

But by this i am getting output width 4.179797.
2.
alert($(".xyz").css('width'));

Output i got is in pixel("px")
3.
alert($(".xyz").width());