Hello friends i share to useful information about this topic... The calculator needs three pieces of information. The first is how far you sit from the screen, measured in feet. The second is what shape your screen is, and the third is screen size. You may enter either the diagonal screen size or the screen width. See the sketch below for details. (If you enter screen width, don't forget to check the appropriate radio button)
If you do not specify a viewing distance, the calculator will tell you what the optimal seating distances are for the selected screen size.
