Monitor Size Guide: How to Choose the Right Screen Size
Understanding Monitor Sizes
Monitor size is measured diagonally from one corner of the screen to the opposite corner, in inches. A 27-inch monitor does not mean 27 inches wide — the actual width depends on the aspect ratio. For a 27-inch 16:9 monitor, the width is about 23.5 inches and the height is about 13.2 inches. Understanding this relationship between diagonal size, aspect ratio, and actual dimensions is key to choosing the right monitor.
Aspect Ratios Explained
16:9 is the standard widescreen aspect ratio used by most monitors and all 1080p/1440p/4K content. 21:9 ultrawide monitors offer about 33% more horizontal space, making them popular for productivity and immersive gaming. 32:9 super ultrawides are equivalent to two 16:9 monitors side by side. Less common ratios include 16:10 (slightly taller, favored by some professionals), 4:3 (legacy square-ish displays), and 3:2 (used in some laptops like the Surface line).
Resolution and PPI
Resolution determines how many pixels fit on the screen. At the same resolution, a larger monitor has lower pixel density (PPI), which can make text and images look less sharp. For 24-inch monitors, 1080p (92 PPI) looks sharp. For 27 inches, 1440p (109 PPI) is the sweet spot. For 32 inches and above, 4K (138 PPI at 32 inches) provides the best clarity. Running a 32-inch monitor at 1080p (69 PPI) can look noticeably blurry for text-heavy work.
Size Recommendations by Use Case
For competitive gaming, 24-25 inches at 1080p lets you see the entire screen without moving your eyes. For general gaming and productivity, 27 inches at 1440p is the most popular choice. For content creation and video editing, 32 inches at 4K gives you plenty of workspace. For replacing a dual-monitor setup, a 34-inch ultrawide provides seamless horizontal space. For professional trading or development, a 38-inch ultrawide or 49-inch super ultrawide maximizes your visible information.
Viewing Distance
The ideal viewing distance depends on monitor size and resolution. A general rule is to sit 1.5 to 2.5 times the diagonal distance away. For a 27-inch monitor, that means 24-32 inches (roughly arm's length). Sitting too close to a large, low-resolution monitor makes pixels visible. Sitting too far from a small monitor strains your eyes. Our comparison tool can help you visualize how different sizes will look on your desk at your typical sitting distance.
Desk Space Considerations
Before choosing a monitor, measure your desk. A 27-inch 16:9 monitor is about 24 inches wide and needs at least a 30-inch deep desk for comfortable viewing. A 34-inch ultrawide is about 32 inches wide. Dual 27-inch monitors require about 48 inches of desk width. Consider monitor arm mounts to free up desk space and allow more flexible positioning. Our tool lets you set your desk size and see how monitors fit on it.