Screen Size Calculator
Calculates screen width and height from diagonal size and aspect ratio.
Lilu Baba's Screen Size Calculator uses the Pythagorean theorem to work out actual width and height from a screen's advertised diagonal size and aspect ratio.
How to use this calculator
- Enter the screen's diagonal size.
- Enter its aspect ratio (e.g. 16:9).
- Width and height update instantly.
Width (inches)
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Height (inches)
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FAQ
Screen Size Calculator — frequently asked questions
16:9 is standard for virtually all modern TVs and monitors; older displays commonly used 4:3.
No — this calculates the visible screen area only, not the overall device size including bezels.