TV Viewing Distance Calculator
Best seating distance for a screen, or best screen size for your room
Find the recommended seating distance for a TV or projector screen using the SMPTE and THX viewing angles, the distance at which you can no longer see pixels, or the screen size that suits your seat.
Everyday UseUpdated October 21, 2026Checked against 5 reference values
Examples
Recommended seating distance
6.5 to 8.8 ft
2.0 to 2.7 m for a 65-inch screen
- THX (40° view)
- 6.5 ft (2.0 m)
- SMPTE farthest (30°)
- 8.8 ft (2.7 m)
- Pixels blend from
- 4.2 ft (1.3 m)
- 68 pixels per inch, 20/20 vision
- Screen width × height
- 56.7 × 31.9 in
What this calculator does
Enter a screen size to find how far away to sit, or enter your seating distance to find the screen size that suits it. The recommendations come from two widely used viewing angle guidelines, and for TVs the calculator also shows the distance beyond which a person with normal vision can no longer see individual pixels at the chosen resolution. A top-down diagram shows the screen and the recommended seats. It works for TVs, monitors and projector screens with a 16:9 picture.
How the distances are worked out
screen width = diagonal × 16 ÷ √(16² + 9²) ≈ diagonal × 0.872
distance = (width ÷ 2) ÷ tan(viewing angle ÷ 2)
pixel limit = 1 ÷ (pixels per inch × tan(1 arcminute))
SMPTE's engineering guideline for cinemas calls for the screen to fill at least 30° of your horizontal view, which sets the farthest seat. THX recommends about 40° for an immersive, cinema-like picture, which sets a closer seat. The pixel limit uses one arcminute, the detail a person with 20/20 vision can resolve.
Worked example
A 65-inch screen is about 56.7 inches wide. For a 40° view, sit 6.5 feet away; to keep at least 30°, sit no farther than 8.8 feet. At 4K resolution its pixels blend together beyond about 4.2 feet, so at either recommended distance the picture looks fully sharp.
Viewing distances by screen size
| Screen | THX 40° | SMPTE 30° (farthest) | 4K pixels blend | 1080p pixels blend |
|---|---|---|---|---|
| 43 in | 4.3 ft | 5.8 ft | 2.8 ft | 5.6 ft |
| 50 in | 5.0 ft | 6.8 ft | 3.3 ft | 6.5 ft |
| 55 in | 5.5 ft | 7.5 ft | 3.6 ft | 7.2 ft |
| 65 in | 6.5 ft | 8.8 ft | 4.2 ft | 8.5 ft |
| 75 in | 7.5 ft | 10.2 ft | 4.9 ft | 9.8 ft |
| 85 in | 8.5 ft | 11.5 ft | 5.5 ft | 11.1 ft |
Does resolution change where to sit?
Resolution sets how close you can sit before the picture looks grainy. With 1080p, sitting at the THX distance on a large screen can put you close enough to see the pixel structure; with 4K the pixels are a quarter the size, so you can sit much closer. Beyond the pixel limit, extra resolution makes little visible difference, which is why a 4K TV viewed from across a large room can look about the same as 1080p. Content quality, such as streaming bitrate, often matters more than pixel count.
Ultrawide monitors and other shapes
The calculator assumes a 16:9 picture, the shape of nearly all TVs and most monitors. Films shot in wider formats show black bars on a 16:9 screen, so the picture itself is narrower than the screen and you may prefer to sit a little closer. For computer monitors, ergonomics guidance usually puts the screen about an arm's length away, which is much closer than these cinema angles, because you need to read small text rather than take in a whole scene.
Room layout tips
Light matters as much as distance. Avoid placing a screen opposite a bright window, where reflections wash out the picture, and consider dimmable lighting behind or beside the screen. In rooms with several rows of seats, aim the recommendations at the main seat and accept that the back row will see a smaller picture.
Choosing a size
- Measure from your usual seat to where the screen will be, then use the screen size mode.
- For sports and films, the THX end of the range feels more immersive; for mixed family viewing, many people prefer something between the two.
- Mount the screen so its center is near eye level when seated; a high screen is tiring to watch.
- Check the wall or stand width as well as the diagonal: a 75-inch screen is about 65 inches wide.
TV Viewing Distance Calculator: common questions
How far should I sit from a 65-inch TV?
About 6.5 feet for a cinema-like 40° view (THX) and no more than about 8.8 feet to keep the 30° minimum from SMPTE.
What size TV should I get for my room?
Measure from your seat to the screen and use the screen size mode. At 8 feet, a screen of about 59 to 80 inches fills the 30° to 40° viewing angles.
Can I sit too close to a TV?
Sitting close will not damage your eyes, but if you can see pixels or have to turn your head to follow the action, you are closer than ideal for that screen.
Do I need 4K at my distance?
Check the pixels blend figure. If you sit farther than the 1080p distance shown, 4K adds little visible sharpness, though it can still help with HDR and streaming quality.
Does this work for projectors?
Yes. Enter the diagonal of the projected 16:9 image. Projector screens are often large, so the recommended distances are longer.
Sources
- SMPTE EG 18-1994, Design of Effective Cine Theaters (minimum 30° horizontal viewing angle)
- THX, viewing distance and screen size recommendations (about 40° field of view)
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