Screen Pixel Density Calculator
Calculate native display PPI, pixel pitch and active width/height from resolution and a measured diagonal; optionally compare two panels.
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How to use Screen Pixel Density Calculator
Use physical panel geometry with square native pixels. Enter your own diagonal measurement; the tool does not inspect your device or infer its screen size, scaling or browser pixel ratio.
- Enter your own values or load the local synthetic example.
- Run the tool and review the complete result and stated assumptions.
- Copy the output or download the generated file.
Good to know
- Native hardware pixels, CSS reference pixels and operating-system scaling are different concepts. No device APIs or fingerprinting.
- Flat rectangular square-pixel model only. A curved-panel diagonal or advertised case size may not represent active geometry.
- Native sides1–1000000 pixels; active diagonal0.01–1000 inches after conversion. No monitor recommendation or viewing-distance model.
Common questions
Can I use devicePixelRatio as the resolution?
No. Enter the actual native horizontal and vertical hardware pixel counts.
Which diagonal should I measure?
The diagonal of the active display area, excluding bezels and the device enclosure.
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