A screen size calculator converts a display's diagonal size (how screens are marketed) into actual width and height dimensions using the aspect ratio. The stated diagonal is the corner-to-corner measurement — a 55-inch TV is not 55 inches wide.
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Pro Tip
For TV size recommendations: sitting distance (cm) ÷ 2.5 = ideal screen diagonal in cm. A 3m viewing distance suggests a 120cm (47") minimum screen.
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