PPI Calculator (Pixel Density)
PPI calculator: pixel density of a screen from its resolution and diagonal, plus dot pitch, physical size and aspect ratio.
PPI = √(w² + h²)diagonal (in)
How to use this calculator
- Type your input in the box.
- The result updates as you type.
- Use “Copy result” or “Copy link” to share it.
PPI = √(width² + height²) ÷ diagonal in inches. Above about 110 PPI on a desktop monitor, individual pixels become hard to see at normal distance.
Frequently asked questions
27-inch 4K monitor?
About 163 PPI.
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