Use this to calculate the dimensions of a display from the diagonal size (usually the one listed in a product information page) and the aspect ratio of the display. The diagonal screen size MUST be in inches. The width and height will output in mm.
I was designing a portable game console that is disguised as a calculator (Casio fx-85GT PLUS), powered by a Raspberry Pi Zero W and needed a suitable screen. I needed to be able to calculate the width and height of the screen to make sure it fitted, so designed this calculator so I could do it easily, and thought I may as well share it if anyone else wishes to use it.