PPI Calculator & Screen Sharpness Tool
Enter your screen size, resolution, and desk depth to see if your display will look sharp or grainy at your viewing distance. Uses PPI (pixels per inch) and human vision science to calculate the result.
Calculator
Diagonal measurement
Distance from your eyes to screen
Results
Good
Very good clarity. Most people won't notice individual pixels at this distance.
108.8
PPI (pixels/inch)
31.6"
Retina distance
23.5" × 13.2"
Screen dimensions (W×H)
2560 × 1440
Pixel resolution
At 24" viewing distance, your 27" 1440p (QHD) screen has 108.8 PPI. Pixels become invisible beyond 31.6" (retina distance). You sit 7.6" closer than the retina distance — consider a higher resolution for pixel-perfect clarity.
PPI Quick Reference Table
| Screen | 1080p | 1440p | 4K |
|---|---|---|---|
| 24" | 92 | 122 | 184 |
| 27" | 82 | 109 | 163 |
| 32" | 69 | 92 | 138 |
| 34" | 65 | 86 | 130 |
| 38" | 58 | 77 | 116 |
| 49" | 45 | 60 | 90 |
Green = retina quality (140+) |Blue = good (110+) |Yellow = acceptable (80+) |Red = grainy (<80)