What is aspect ratio?

Aspect ratio is the proportional relationship between screen width and height, expressed as x:y. Common ratios include 16:9 (HD TV), 4:3 (traditional monitor), 21:9 (ultrawide), and 16:10 (some laptops).

PPI (Pixels Per Inch) measures pixel density. Higher PPI means sharper display. Desktop monitors typically range 100-150 PPI, while phone screens range 300-500 PPI.

What are 1080p and 4K resolutions?

1080p is 1920x1080 (about 2MP). 4K UHD is 3840x2160 (about 8.3MP), 4 times 1080p. 8K resolution is 7680x4320.

How to calculate screen size?

Screen size is the diagonal measurement in inches. Use Pythagorean theorem: diagonal = sqrt(width^2 + height^2). Then convert pixels to inches by dividing by PPI.

📐 Resolution Calculator

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Updated: 2026-07-11