Screen PPI Calculator
PPI for this screen, using its device pixel ratio.
CSS pixels are multiplied by this screen’s device pixel ratio (1).
128.8 PPI
Worked example
CSS pixels are multiplied by this screen’s device pixel ratio before the diagonal is applied. A ratio of 2 turns 1512 CSS pixels of width into 3,024 device pixels.
FAQ
- Why multiply by the device pixel ratio?
- CSS pixels are not always physical pixels. On a retina-style screen one CSS pixel is two or more device pixels.
- What should I enter for the diagonal?
- The physical screen size in inches, the same number you would use for a monitor.
- Will two laptops with the same CSS size match?
- Only if the pixel ratio and the physical diagonal match. The page reads the ratio from the browser you are using.