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Pixel Density calculator
Pixel Density
PPI = √(w² + h²) / d · Screen Resolution
PPI = √(w² + h²) / diagonal | Pixels per Inch
About the Pixel Density calculator
Pixel density (PPI) tells you how sharp a screen is. Enter the resolution and screen size to find pixels per inch.
How to use the Pixel Density calculator
- Enter the Width (px) and Height (px) of the screen resolution.
- Enter the Diagonal (inches).
- Press Calculate.
Formula and method
PPI = √(width² + height²) ÷ diagonal in inches
Worked example
A 1920 × 1080 screen that is 27 inches across the diagonal has about 81.6 PPI. The same resolution on a 24-inch screen is about 91.8 PPI.
Tips
- Phones are typically above 400 PPI, monitors between 90 and 160.
- Higher PPI makes text and images look sharper at the same viewing distance.
Frequently Asked Questions
Beyond a certain point, your eyes cannot see the difference at normal viewing distance.