How Big Is My Browser
Quickly figure out your current browser size.
An easy way to figure out your current browser size, without having to install an extension is to use HowBigIsMyBrowser.com
This is an easy site that gives you the current viewing size of your browser window. It's handy to have when trying to debug an issue. Also useful when creating websites and determining the best default size to target to.
Because you have to allow for the scroll bars and window chrome. If you're specifically targeting mobile browsers, then 320 pixels wide might be a good choice, although mobile browsers typically scale content to fit the view width, so 950 or 960 pixels wide can be great.
Check it out right now to see what you're currently viewing this site as!