What TV Screen Size Do You Actually Need?
The Definitive UK Guide

The single most common mistake when buying a TV is choosing a screen that's too small. You'll sit a metre and a half away, squinting at a 43-inch screen, and wish you'd gone bigger. Here's how to get it right first time.

The Viewing Distance Rule

For 4K TVs, the optimal viewing distance is roughly 1.5× the screen diagonal. At this distance, you'll be able to resolve all the detail in a 4K image without noticing individual pixels.

For example: a 55-inch TV has a diagonal of 140cm. Multiply by 1.5 and you get 210cm — about 2 metres. That's closer than most people sit. The point: most people can comfortably go larger than they think.

Room-by-Room Recommendations

Room / use case	Typical viewing distance	Recommended size	Our pick
Small bedroom	1.2–1.6m	32"–43"	Samsung Q60D 50"
Master bedroom	1.5–2.0m	43"–55"	LG C4 OLED 55"
Small living room	2.0–2.5m	55"–65"	Hisense U8N 55"
Average living room	2.5–3.0m	65"–75"	TCL C855 65"
Large living room / open plan	3.0m+	75"+	Samsung QN90D 75"

Common Mistakes to Avoid

Buying too small — the most common. A 43-inch TV in a medium living room looks like a monitor. You'll notice it within a week.

Ignoring the room layout — measure your actual viewing position, not an optimistic one. If the sofa is 3 metres away when the room is tidy, it's 3 metres.

Confusing inches and centimetres — TV sizes are measured diagonally in inches. A 65-inch TV is about 145cm wide. Make sure you measure the wall space, too.

Not accounting for screen bezel changes — modern TVs have minimal bezels, so the overall unit is smaller than older TVs at the same screen size.

Our Recommendation

If you're in doubt between two sizes, go bigger. Nobody has ever complained that their TV was too large after a week of watching. The opposite happens regularly.

For most UK living rooms with a viewing distance of 2.0–2.5 metres, a 55-inch TV is the minimum we'd recommend. A 65-inch TV is the sweet spot for anyone whose sofa is 2.5 metres or more from the screen.