The distance between sofa and television
One to two times the diagonal for a 4K TV, not more
The rule still circulating today, 'two and a half times the diagonal', dates from HD screens. With a 4K TV, you can and should sit closer.

How far should you sit from the television?
For a 4K TV, allow 1.5 to 2.5 times the screen diagonal, measured from the TV wall to the front of the sofa. That means 2.1 to 3.5 m for 55 inches, 2.5 to 4.1 m for 65 inches. The old 2.5 times rule only applies to HD.
§ 01The principle
The classic rule said "two and a half times the screen diagonal". It was valid for old HD televisions whose low resolution required significant distance to avoid seeing pixels.
With modern 4K TVs, this rule is obsolete. The recommended distance for a 4K TV is between 1.5 and 2.5 times the diagonal, even 1.2 to 1.6 times for an immersive cinema experience.
Too far: you lose immersion and the screen appears small. Too close: eye fatigue.
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4K TV, distance = 1.5 to 2.5 × screen diagonal
55 inches (140 cm): 2.1 to 3.5 m. 65 inches (165 cm): 2.5 to 4.1 m.
§ 02Putting it into practice
Identify your screen diagonal in inches, multiply by 2.54 to get centimetres, then multiply by 1.5 and 2.5 for your distance range. Measure from the TV wall to the front of the sofa.
The centre of the screen must be at seated eye level: approximately 95-115 cm from the floor for a standard sofa and average-height person.
Common mistake: TV above the fireplace. Forces the gaze permanently upward, creating neck tension. Avoid absolutely unless the mantel is under 50 cm high.
[VISUAL 3 · BEFORE/AFTER · Type B, comparison] Caption: Left, TV too small for the viewing distance. Right, TV correctly sized.
- 01Calculate the 1.5 to 2.5× diagonal range
- 02Measure the actual distance before buying the TV
- 03Position the screen centre at seated eye level
- 04Choose TV size based on the room
- 01Applying the old 2.5× diagonal rule (obsolete HD)
- 02A 75-inch TV in a room with 3 metres viewing depth
- 03TV above the fireplace, forcing the gaze upward
- 04Choosing the TV first and adapting the room after
§ 03Professional variations
Interior designers often hide the TV behind a sliding panel or treat it as a work of art when on (Samsung The Frame). The principle: the TV must not be the focal point when it is off.
For home cinema enthusiasts, distance can drop to 1.2× the diagonal for stronger immersion (40° viewing angle). Requires a dedicated room.
A sophisticated practice: separating the TV zone from the conversation zone. Main sofa for viewing, secondary seating perpendicular for conversation.
One to two times the diagonal for a 4K screen, never two and a half.
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For this rule
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