Monitor Dimensions from Diagonal
Find a screen's width, height and area from its diagonal size and aspect ratio, plus recommended viewing distance, free online.
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For diagonal D and aspect ratio a:b, width = D·a ÷ √(a²+b²) and height = D·b ÷ √(a²+b²). A comfortable viewing distance is about 1.5–2× the diagonal for a desktop monitor; for TVs, THX recommends distance ≈ diagonal × 1.2 (for 4K, at which the pixels are no longer visible).