Screen PPI calculator
Calculate pixels per inch from resolution and diagonal size.
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Tool guide
Screen PPI calculator: how it works
Practical information to understand the result and use this tool correctly.
About Screen PPI calculator
Pixels per inch measures how densely pixels are packed on a diagonal-specified panel. Higher PPI generally looks sharper at the same viewing distance.
PPI = √(width² + height²) / diagonal_inches using the resolution’s pixel counts.
Marketing “Retina” claims depend on viewing distance; use PPI as a neutral comparison between monitors and phones.
How to use it
- 1Enter width px, height px, and diagonal inches.
- 2Calculate PPI.
- 3Compare panels before buying or designing UI assets.
Frequently asked questions
- Logical vs physical pixels?
- Use the panel’s native resolution, not CSS CSS-px after scaling, for hardware PPI.
- Ultrawide screens?
- The same formula applies; extreme aspect ratios still use the pixel diagonal over the stated inch size.