MeasureSparkReference dataset · Version 2026-09-13
Screen PPI chart
Direct answer: Pixel density increases when more pixels fit into the same diagonal and decreases when the same resolution is spread across a larger screen. PPI is calculated from the diagonal pixel count divided by the visible diagonal in inches; it is not the same as CSS pixels, operating-system scaling or viewing-distance guidance.
| Display | Resolution | Diagonal | PPI |
|---|---|---|---|
| 24-inch Full HD | 1920 × 1080 | 24 in | 91.8 |
| 27-inch Full HD | 1920 × 1080 | 27 in | 81.6 |
| 27-inch QHD | 2560 × 1440 | 27 in | 108.8 |
| 27-inch 4K UHD | 3840 × 2160 | 27 in | 163.2 |
| 32-inch QHD | 2560 × 1440 | 32 in | 91.8 |
| 32-inch 4K UHD | 3840 × 2160 | 32 in | 137.7 |
| 43-inch 4K UHD | 3840 × 2160 | 43 in | 102.5 |
| 55-inch 4K UHD | 3840 × 2160 | 55 in | 80.1 |
| 65-inch 4K UHD | 3840 × 2160 | 65 in | 67.8 |
How are the values calculated?
PPI = sqrt(horizontal pixels² + vertical pixels²) / diagonal inches. The table assumes the listed resolution is native, the advertised diagonal is visible and pixels are square. PPI is rounded to one decimal place.
Why can a product specification differ?
Manufacturers can round diagonal size, list a product family, or report a different usable panel area. Use the exact model specification for purchasing, calibration and installation decisions.
Download the JSON dataset or calculate another resolution and diagonal.