The best practice for determining a monitor's size is to measure the length from the top left corner to the bottom right corner of the screen using measuring tape. Please ensure that the bezel is not included in these measurements as monitors are measured by their display panel, not the overall size of the monitor. 

What Is the Best Monitor Size for Office Work?

Looking for a new monitor and are unsure about which size to choose? 27-inch monitors are an ideal option for both work and gaming as the majority of monitors produced today are offered at this size allowing for easy comparison between models.