Monitor size depends on personal preference and location.  A 24-inch monitor is fine for a desk that is around 24 inches deep, or less. Its small size will still be sufficient because the monitor is closer to you. Most people, however, will want to go with a 27-inch monitor. The added size will make the monitor easy to see. This also opens up a wider range of 4K monitor options, as 4K is very rare on a 24-inch monitor. Larger monitors, such as a 32-inch widescreen or 34-inch ultrawide, are great for deep desks and people who want an immersive experience. Monitors this large can serve as a TV replacement in a small room.  Displays of even larger size, such as 42-inch or 48-inch HDTVs, are best for home theater setups or an unusually large office. You’ll want to sit four to six feet away from a display of this size.