The TV Viewing Distance Calculator tells you how far to sit from a television so the picture fills a comfortable, cinema-like portion of your field of view. It works from the screen’s diagonal size and pure geometry — no guesswork.
How the range is worked out
For a 16:9 screen the picture width is diagonal × 16 ÷ √(16² + 9²), about
0.87 of the diagonal. The comfortable distance for a chosen horizontal viewing
angle θ is:
distance = (width ÷ 2) ÷ tan(θ ÷ 2)
The tool uses two widely-cited angle references as the endpoints of its recommended range:
- 40° (THX immersive) — the near end, for a cinema-like field of view.
- 30° (SMPTE minimum) — the far end, the smallest angle recommended for a cinematic image.
Example distances
| TV size | Immersive (40°) | Cinematic (30°) |
|---|---|---|
| 43” | ~4.4 ft | ~5.9 ft |
| 55” | ~5.6 ft | ~7.5 ft |
| 65” | ~6.6 ft | ~8.9 ft |
| 75” | ~7.6 ft | ~10.2 ft |
Which end of the range should I choose?
Sit toward the near end for an enveloping, movie-theatre feel — modern 4K panels have enough pixel density that the image stays sharp up close. Move toward the far end if the screen feels too big to take in comfortably, or if you are watching lower-resolution content where getting closer would reveal the pixel grid.