Tool
PPI calculator: pixel density of any display
Calculate pixels per inch, pixel pitch, physical size and megapixels for any monitor from its diagonal and resolution.
–Pixels per inch
–Width × height (in)
–Width × height (cm)
–Distance where pixels disappear (20/20)
–Pixel pitch (mm)
–Megapixels
–Horizontal field of view at your distance
–Pixels per degree at your distance
How PPI is calculated
Pixels per inch is the number of pixels along the diagonal divided by the diagonal in inches:
PPI = √(width² + height²) ÷ diagonal
For example, Alter Ego Atelier 40 has 5120 × 2160 pixels across 40 inches: √(5120² + 2160²) = 5557 pixels, ÷ 40 = about 139 PPI.
What is a good PPI for a monitor?
- Around 110 PPI is the natural density for desktop monitors used at 100% scaling. A 27-inch QHD display like Solitaire 27 and 49-inch 5120 × 1440 displays like Nocturne 49 sit at about 109 PPI.
- Around 140 PPI gives noticeably crisper text and detail, with slightly smaller interface elements or modest scaling.
- Around 160–220 PPI is designed for 1.5× to 2× scaling and very sharp type.
Pixel pitch
Pixel pitch is the distance between pixel centres: 25.4 ÷ PPI, in millimetres. Smaller pitch means finer detail.