Monitor DPI Calculator
Width (px)
Height (px)
Screen Size (inches)
Monitor PPI (pixels per inch) measures screen sharpness. Apple's "Retina" threshold is ~220 PPI, at which individual pixels cannot be seen at normal viewing distance.
- 1PPI = √(Width² + Height²) / Screen diagonal (inches)
- 2Higher PPI = sharper image at same viewing distance
- 3OS scaling (HiDPI/Retina) makes text readable at 144–220+ PPI
- 44K at 27" ≈ 163 PPI; MacBook Pro ≈ 220+ PPI
2560×1440 (QHD), 27 inch screen=PPI = √(2560²+1440²)/27 ≈ 108.8 PPI
| Resolution | Screen size | PPI |
|---|---|---|
| 1920×1080 | 24" | ~92 |
| 2560×1440 | 27" | ~109 |
| 3840×2160 (4K) | 27" | ~163 |
| 3840×2160 (4K) | 24" | ~184 |
References
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