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Screen Size Calculator

Width, height, and area of a display from its diagonal and aspect ratio.

Compute the width, height, and area of a display from its diagonal length and aspect ratio (e.g. 16:9, 21:9, 4:3).

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

in

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

For aspect ratio w:h with diagonal d: width = d · w / √(w² + h²), height = d · h / √(w² + h²).

In depth

Compute the width, height, and area of a display from its diagonal length and aspect ratio (e.g. 16:9, 21:9, 4:3).