PPI Calculator
Calculate the pixel density of any monitor. Higher PPI = sharper text and images at the same viewing distance.
What is PPI?
PPI (pixels per inch) measures pixel density. Formula: PPI = √(width² + height²) ÷ diagonal_inches.
| PPI range | Rating | Typical use |
|---|---|---|
| Below 80 | Low | Large TVs at distance |
| 80–100 | Acceptable | Basic monitors, 27" 1080p |
| 100–130 | Good | QHD 27", 4K 32"+ |
| 130–160 | Very good | 4K 27", 5K 32"+ |
| 160+ | Excellent | 4K/5K 27", Retina |