Device Reference

Monitor & External Display Screen Sizes

Common monitor sizes, resolutions, and aspect ratios for desktop and laptop external displays.

Desktop monitors are defined by diagonal size, resolution, and aspect ratio. Use this guide when buying a display, matching replacement panels, or using our PPI calculator.

Common monitor sizes

Size Typical resolution Aspect Notes
24" 1920 × 1080 (FHD) 16:9 Office, budget gaming
27" 2560 × 1440 (QHD) 16:9 Sweet spot for sharpness
32" 3840 × 2160 (4K) 16:9 Content creation, gaming
34" ultrawide 3440 × 1440 21:9 Multitasking workflows
49" super ultrawide 5120 × 1440 32:9 Dual-monitor replacement

Laptop external displays

When you connect a monitor, your OS reports the external panel resolution. Run the screen checker on the monitor you are actively using for accurate specs.

MacBook built-in sizes are covered in our MacBook screen sizes guide.

Resolution vs physical size

A 27" 4K monitor has much higher PPI than a 27" 1080p panel. Read resolution vs screen size for the full explanation.

Check your device now

Use our free screen size checker to detect your exact specs instantly.