Screen Size Calculator
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Formula
k = diagonal / sqrt(W² + H²). Width = W × k. Height = H × k. Area = width × height. (W:H = aspect ratio).
Frequently Asked Questions
How do I calculate screen width from diagonal?
Using the aspect ratio and Pythagorean theorem: width = diagonal × (W / sqrt(W² + H²)), where W:H is the aspect ratio.
What is the most common aspect ratio?
16:9 is the most common aspect ratio for modern TVs, monitors, and laptops.