I usually rely on W3C Schools screen resolution statistics. Though, here and then we do need to have a precise resolution for a specific device. Of course the resolution can be found on the manufacturer’s website. But it takes some time, and it is the theoretical resolution. In the real world, this data is to be modified according to a lot of system’s elements that are added to the screen, and thus occupy some pixels: web browser address and navigation bars, scroll bars, etc. To be sure about the actual design space available on the device, I use Websitedimension.com’s Live Pixel check. The idea is very simple: a grid with a scale, allowing to easily count how many pixels can actually be displayed in height and width.

Go to: Websitedimension.com’s Live Pixel check →