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Screen PPI Calculator

Find a display's pixels per inch.

Width (px)

Height (px)

Diagonal size

Calculated Output

Pixels per inch (PPI) 91.788

Formula: PPI = √(width² + height²) ÷ diagonal

Step-by-Step Breakdown

1. Values used:

2. Width = 1,920 px

3. Height = 1,080 px

4. Diagonal size = 24

6. Pixels per inch = 91.788PPI

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The math behind it

PPI = diagonal pixel count √(w² + h²) ÷ diagonal size in inches.

1920×1080 on 24 in → 91.8 PPI.

What's 'retina'?

Roughly 300+ PPI at typical viewing distance, where pixels become indistinguishable.