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.