Size for distance / 12 feet
What size TV for 12 feet away?
From 12 feet (144 in, 366 cm), a 89-inch screen fills the SMPTE 30° everyday view and a 120-inch screen fills THX's 40° cinema view. Sizes in that range listed here: 98", 100", 115".
The numbers for 12 feet
| Basis | Screen size | Screen width | Reading it |
|---|---|---|---|
| SMPTE 30° (mixed viewing) | 89" | 77.2 in | The screen fills 30° of your view — the comfortable everyday figure. |
| THX 40° (cinema) | 120" | 104.8 in | The screen fills 40° — immersive for film, a lot for news and sport all day. |
| 4K's own pixels visible from | 185" | 160.8 in | Only screens this big show 4K's pixels to 20/20 eyes from 12 ft — the point where 8K would start to help. |
| 4K looks sharper than 1080p from | 92" | 80.4 in | On smaller screens, 1080p already reaches the limit of 20/20 vision from 12 ft, so 4K adds no visible sharpness. |
At 12 feet the point where 4K looks sharper than 1080p, 92 inches, falls between the SMPTE and THX sizes: at the everyday size the difference is marginal, at the cinema size it is visible. 4K's own pixels only become visible from 12 feet on a 185-inch screen — larger than any TV listed — which is why 8K adds nothing you can see at this distance.
What a 12-foot room usually looks like
Twelve feet is a great room or a long lounge. The standards call for screens most TV lines don't make, so the practical choice is the largest TV that fits the wall and the budget, or moving the seating forward.
12 feet is a big room: a great room, a basement den or a long living room. The THX size of 120 inches is past what most TV lines offer, so this is where very large TVs (98", 100", 115") and projectors meet; a TV gives brightness for a sunny room, a projector the size for a dark one.
Compared with 11 feet, every extra foot of distance adds about 7 inches to the SMPTE size and 10 to the THX size. The SMPTE size is within reach of the largest TVs listed; the THX size is not.
Choosing within the range
The two standards bracket a sensible choice rather than giving one answer. Lean toward 89 inches for a room used for news, sport, gaming at a desk distance, or a bright room where a huge black rectangle dominates when the set is off. Lean toward 120 inches for a room built around films. Your eyes, not the chart, settle it: if you turn your head to follow the action, the screen is past 40° for you; if you lean forward to read captions, it is under 30°.
Measure from where your eyes are when seated to where the screen will be — not from the wall. A TV on a stand sits several inches in front of the wall, and a full-motion mount can bring it forward a foot or more. For comparison, the SMPTE distance for a 55-inch is 7 ft 5 in and the THX distance for a 65-inch is 6 ft 6 in.
TVs to look at for 12 feet
- 98-inch: 8 models, e.g. LG 98NU850BPUB, Samsung QN98QN990FFXZA
- 100-inch: 5 models, e.g. LG 100QNED84BU, Samsung MRN100R85HFXZA
- 115-inch: 4 models, e.g. LG 115QNED92BU, Samsung MRN115MR95FXZA
Sizes are geometry from the viewing angles and the 20/20 acuity limit cited by Wikipedia's Optimum HDTV viewing distance article, for a 16:9 screen. Viewing distances are geometry from published viewing angles: a 16:9 screen's width is 0.8716 x its diagonal, and the distance at which it fills a horizontal angle A is width / (2 x tan(A/2)). Resolution distances use the 20/20 acuity limit of one arcminute per pixel. The same formulas reproduce the reference figures quoted in the source (30 degrees = 1.6264 x diagonal; 31.2 degrees for 1080p; 58.37 degrees for 4K).