How do you determine monitor size?

Monitor size is typically determined by measuring the diagonal distance across the screen, from one corner to the opposite corner. This measurement is expressed in inches. It is important to note that the size of a monitor is not solely determined by its diagonal measurement, as the aspect ratio (e.g., 16:9 or 4:3) also plays a role in determining the overall dimensions of the screen. When selecting a monitor size, consider the intended use, viewing distance, and resolution requirements to ensure an optimal viewing experience.