Enter the height, width, and resolution (in total pixels) of a screen to calculate the dpi of that screen.
DPI stands for dot per inch, or in other words, pixel per inch. There for DPI is a measure of total pixels per inch of screen. The end result of this is the following formula:
DPI = Total Pixels Horizontally /Total Width + Total Pixels Vertically / Total Length
DPI is defined as the total number of dots per inch of a screen.