I few months ago I developed a simple but effective little web page with some javascipt and jQuery that would allow me to determine, based on a width, a 16:9 aspect ratio. I found myself always having a specific width from a content area and I wanted to determine the video size I could fit in there. Problem was, I didnt want to waste time calculating the all important aspect ratio from the width I had.
I searched the net and couldnt find anything useful, so I built one myself:
This was just whipped together quickly and I found it useful. I’m pretty sure it could be tweaked, but it fits its purpose as is right now. Let me know if this helps you at all. enjoy.
August 27th, 2009

Nice tool! Typically I just open a video in QuickTime Player, show the Movie Inspector palette and then resize the window. The inspector shows the “Normal” and “Current” size.
This is extremely helpful. I just had a client come to me asking us to compress some files in a very odd aspect ratio. Using your jquery tool I demonstrated what 16:9 meant. Nice.