PPI Calculator
Calculate the pixels-per-inch (pixel density) of any screen from its resolution and diagonal size.
Pixel density
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Dot pitch —
Sharpness —
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How it works
PPI = √(width² + height²) ÷ diagonal size in inchesFrequently Asked Questions
How is PPI calculated?
Take the diagonal resolution — √(width² + height²) in pixels — and divide by the screen's diagonal in inches. A 1920×1080 display on a 24-inch monitor is about 92 PPI; the same resolution on a 6-inch phone is about 367 PPI.
What is a good PPI?
Around 90–110 PPI is normal for desktop monitors, 200+ for laptops, and 300+ for phones (Apple's 'Retina' threshold at typical viewing distance). Higher PPI means sharper text and images.
Does higher PPI always look better?
Up to a point — beyond what the eye resolves at your viewing distance, extra PPI is invisible but costs battery and performance. Phones are held closer, so they need more PPI than a TV watched across a room.