What Size TV Should I Get? Viewing Distance Explained

“What size TV should I get?” is one of the most common questions before a TV purchase — and one of the most common regrets afterwards. The answer depends mainly on how far you sit from the screen.

Below: a simple rule, a size chart and practical tips. Once you’ve chosen a size, our home theater setup guide covers the rest of the room.

The simple rule

For 4K TVs, a good viewing distance is roughly 1 to 1.5 times the screen’s diagonal.

Or, working backwards from your seat:

Ideal screen size ≈ viewing distance ÷ 1.2 (for an immersive, cinema-like view)

Comfortable screen size ≈ viewing distance ÷ 1.5 (for a more relaxed view)

These guidelines are based on how much of your field of view the screen fills — cinema standards recommend roughly 30–40 degrees for an immersive experience.

Size chart for 4K TVs

Viewing distance	Immersive (≈ 1.2×)	Comfortable (≈ 1.5×)
1.5 m	50”	40”
2.0 m	65”	55”
2.5 m	85”	65”
3.0 m	100”	80”
3.5 m	115” (projector)	90”

Sizes are rounded to common TV sizes.

Why 4K lets you sit closer

With more pixels, 4K stays sharp closer up. With HD (1080p), the individual pixels and compression become visible sooner, so you’d sit a bit further back — roughly 1.5 to 2.5 times the diagonal.

Much streaming content is still HD, but modern 4K TVs upscale it well. If you watch a lot of 4K content, err towards the larger size. For what true 4K needs, see 4K streaming requirements.

How to measure your room

1. Sit where you normally watch.
2. Measure from your eyes to where the screen will be (not to the wall behind it if the TV will stand forward).
3. Note the width available for the TV, including any stand or furniture.
4. Check doorways and stairs for getting a large box in.

Tip: Cut a piece of cardboard (or tape an outline on the wall) to the size of the TV you’re considering. Live with it for a day — it’s the best way to judge.

Screen dimensions for common sizes

Approximate width × height of the screen (16:9), without the frame:

Size	Width	Height
43”	95 cm	54 cm
50”	111 cm	62 cm
55”	122 cm	68 cm
65”	144 cm	81 cm
75”	166 cm	93 cm
85”	188 cm	106 cm

Mounting height

• The centre of the screen should be near seated eye level — often around 100–110 cm from the floor.
• For larger screens, keep the bottom edge low enough that you don’t look up.
• Avoid mounting high above fireplaces unless you use a pull-down mount.

Seating tips

• Put the main seat on the screen’s centre line.
• Avoid steep side angles, especially with LED TVs, where colours and contrast fade off-axis.
• For multiple rows, raise the back row or stagger seats.

What about black bars?

Bigger screens make widescreen films’ black bars more noticeable — they’re normal and keep the picture’s original shape. Our explainer on why there are black bars on movies covers why, and why zooming isn’t a good fix.

Worked examples

A small living room

You sit 2.0 m from the wall where the TV will go, but the TV stand brings the screen forward by 0.1 m, so your real distance is 1.9 m.

• Immersive: 1.9 ÷ 1.2 ≈ 1.58 m diagonal ≈ 62” → a 65” TV.
• Comfortable: 1.9 ÷ 1.5 ≈ 1.27 m ≈ 50” → a 50–55” TV.

If you watch lots of films in the evening, the 65” will feel more cinematic. If the room is also used for other things and the TV is often on in the background, 55” may suit better.

A large open-plan room

Your sofa is 3.2 m from the TV wall.

• Immersive: 3.2 ÷ 1.2 ≈ 2.67 m ≈ 105” — into projector territory.
• Comfortable: 3.2 ÷ 1.5 ≈ 2.13 m ≈ 84” → an 85” TV.

Here, the comfortable figure is already a very large TV. If that’s beyond budget, consider moving the seating closer — it’s free and often transforms the experience.

A bedroom

You watch from bed, 2.5 m away, mostly at night.

• Comfortable: 2.5 ÷ 1.5 ≈ 1.67 m ≈ 65”.

In practice, many people choose 50–55” for bedrooms because of wall space. That’s fine — the guidelines are about immersion, not rules.

Size, resolution and content quality

Bigger screens magnify everything — including weak sources:

Source	On a big screen
4K HDR streaming	Looks superb
HD streaming	Looks good on a TV with strong upscaling
Standard definition / old content	Softness becomes obvious
Low-bitrate live streams	Compression artefacts more visible

If much of what you watch is lower quality, sitting slightly further back (or choosing a size smaller) can make it look cleaner. A stable connection also helps the stream hold its best quality — see internet speed for streaming.

Projectors: when bigger really is better

If your ideal size comes out above 85–100”, a projector may be more practical. Projectors can deliver 100–120” images affordably, but they need a darker room and a suitable wall or screen. For most living rooms with daytime viewing, a large TV is still the more versatile choice.

Common sizing mistakes

• Buying too small — the most common regret.
• Measuring to the wall instead of to the screen.
• Ignoring the furniture — stands must be wide and sturdy enough.
• Forgetting sound — a bigger picture benefits from bigger sound; consider a soundbar.

Budget trade-offs

If your budget forces a choice between bigger and better:

• In a bright room where you sit far back, size often matters more.
• In a dark room for films, a slightly smaller, higher-quality TV (better contrast and HDR) may look more impressive.

Our smart TV buying guide explains the picture-quality features worth paying for.

The bottom line

Measure from your eyes to the screen and divide by 1.2–1.5 to find your ideal 4K TV size. When in doubt, go a size bigger — almost nobody complains their TV is too large after the first week.