How far to sit from a 55 inch TV?
1.7–2.3 m 5 ft 6 in to 7 ft 5 in
Sit 1.7 m (5 ft 6 in) to 2.3 m (7 ft 5 in) from a 55-inch TV: the screen then fills 40° to 30° of your view, the THX and SMPTE figures. In one lab study, people chose to sit further back, about 2.8 m (9 ft 2 in) from a screen this size.
Those two figures are the cinema industry's, and they describe a screen that fills your view the way a cinema screen does. Most living rooms seat people further back than that, and the lab study suggests many prefer it. Treat the range as the closest you would want to sit, not a target you have missed.
If your sofa is further away than the far figure, nothing is wrong with the room. The screen simply fills less of your view, and the next size up would fill more.
Worked out for A 55-inch screen in the usual wide shape, 122 × 68.5 cm (48 × 27 in). Change the numbers
The working
- A 55-inch 16:9 screen is 122 cm wide and 68 cm tall.
- Seat distance: the screen fills 40° (THX) at 167 cm and 30° (SMPTE) at 227 cm.
In one lab study, people chose to sit about 280 cm from a screen this size: further back than the industry figures.
The rules, and their sources
THX 40°
THX's best seat fills 40° of your view, about 1.2 times the diagonal away. THX's own range runs from 40° (closest) to about 28° (farthest).
An industry guideline Source: Wikipedia, Optimum HDTV viewing distance (checked 31 October 2026).
SMPTE 30°
The screen fills 30° of your view when you sit about 1.6 times its diagonal away. It is widely quoted as the SMPTE figure.
An industry guideline Sources: Wikipedia, Optimum HDTV viewing distance (checked 31 October 2026); Audioholics, How to find the right size TV (checked 15 October 2026).
Other screen sizes
The closest seat fills 40° of your view (THX) and the farthest 30° (SMPTE). Both grow in step with the screen.
| Screen | Closest | Farthest |
|---|---|---|
| 43-inch | 1.3 m (4 ft 3 in) | 1.8 m (5 ft 10 in) |
| 50-inch | 1.5 m (5 ft) | 2.1 m (6 ft 9 in) |
| 55-inch this page | 1.7 m (5 ft 6 in) | 2.3 m (7 ft 5 in) |
| 65-inch | 2.0 m (6 ft 6 in) | 2.7 m (8 ft 10 in) |
| 75-inch | 2.3 m (7 ft 6 in) | 3.1 m (10 ft 2 in) |
| 85-inch | 2.6 m (8 ft 6 in) | 3.5 m (11 ft 6 in) |
Change the numbers
Your sizes will differ. The TV height and distance calculator opens with these numbers filled in: change any of them and the answer, the working and the drawing follow.
Editorial notes
Worked out by the Snuug team on 12 November 2026 with the same code as the TV height and distance calculator, so the two cannot disagree. Every rule cites its source, with the date we last checked it. A rule designers use is a convention, not a study.
Other sources the calculator draws on:
- Acoustic Frontiers, Home theater viewing angles, distances and sightlines (CEDIA, 15°), checked 31 October 2026
- Journal of the ITE of Japan 65 (2011), preferred viewing distance of HD LCD TVs, checked 24 October 2026