Pixel Density Calculator
Calculate PPI (pixels per inch), dot pitch, and physical dimensions for any resolution and screen size. Understand pixel density vs resolution.
Office comfortable, text mostly clean.
- Aspect ratio
- 16:9
- Dot pitch
- 0.233 mm
- Physical width
- 23.53" (59.8 cm)
- Physical height
- 13.24" (33.6 cm)
- Total pixels
- 3.69 MP
What is pixel density?
Pixel density is the number of pixels per inch (PPI) on your display. It determines perceived sharpness much more than raw resolution. A 27-inch 4K monitor at 163 PPI looks dramatically sharper than a 55-inch 4K TV at 80 PPI, despite having the same pixel count.
Pixel density vs resolution
Resolution is how many pixels a display has (e.g. 3840x2160). Pixel density is how tightly those pixels are packed. Two displays with identical resolution but different panel sizes will look entirely different at the same viewing distance - the smaller panel wins on sharpness.
What PPI is considered Retina?
Apple defines Retina as a density where individual pixels are indistinguishable at normal viewing distance. For phones held at 25 cm, that is roughly 326 PPI. For desktop monitors viewed at 50-60 cm, about 200-220 PPI is Retina-class.
Recommended PPI by use case
- Office / productivity: 90-110 PPI, no UI scaling needed
- Modern desktop: 110-140 PPI, sharp without scaling
- Creative / high-DPI: 140-200 PPI, 125-150% scaling
- Retina-class laptop: 200-260 PPI, 2x scaling standard
- Phones: 300-500 PPI typical
What is dot pitch?
Dot pitch is the distance between pixel centers, measured in millimeters. It is the inverse of PPI. Lower dot pitch means higher density and finer detail. Desktop monitors typically range from 0.17 mm (high-density 4K) to 0.31 mm (low-density large TVs).
For a deeper explanation, read Pixel Density vs Resolution or check Screen Info to see your current display specs.