Use below code to Get actual height of scaled transformed element. [jsFiddle
]
user 'outerHeight' instead of 'height'
http://jsfiddle.net/ZvzXJ/8/
//full code here
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<style>
.button{
-webkit-transform: scale( 3 );
margin:100px;
display:block;
}
</style>
<script src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script>
$(document).ready(function($) {
$(window).load(function(){
alert($('.button').outerHeight()+ 'px');
alert($('.button').css('height'));
});
});
</script>
</head>
<body>
<button class="button">Welcome</button>
</body>
</html>