PPI Calculator
Compute a screen's pixel density from resolution and size.
Pixel density
109 PPI
Visible pixels up close
Total pixels
3.7 MP
Dot pitch
0.233 mm
Sharpness per inch
PPI divides the diagonal pixel count by the diagonal inches: a 27" 1440p monitor lands at 109 PPI, a phone at 460. Perceived sharpness depends on viewing distance — 110 PPI at 70 cm resolves like 300+ PPI at 30 cm, which is Apple's 'retina' arithmetic.
Choosing by density
For desktop work, ~110 PPI renders text at 100% scaling comfortably; 4K at 27" (163 PPI) wants 150% scaling. TVs get away with 40–80 PPI because sofas are far. Match density to distance rather than chasing resolution alone.
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