jQuery get the rendered height of an element?

How do you get the rendered height of an element?

Let’s say you have a <div> element with some content inside. This content inside is going to stretch the height of the <div>. How do you get the “rendered” height when you haven’t explicitly set the height. Obviously, I tried:

var h = document.getElementById('someDiv').style.height;

Is there a trick for doing this? I am using jQuery if that helps.