PPI and Pixel Density Calculator
Works out how densely a screen packs its pixels.
Pixel density
— PPI
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Dot pitch — mm
Screen width —
Screen height —
The formula
PPI = √(width² + height²) ÷ diagonal in inches
Dot pitch is the distance between pixels: 25.4 mm ÷ PPI. Square pixels are assumed.
What to watch out for
The diagonal is the viewable size. The sharpness you see also depends on how far away you sit.
Frequently Asked Questions
What is the PPI of a 27-inch 1440p monitor?
108.8 PPI.
What about 27 inches at 4K?
163.2 PPI.