About the TV Viewing Distance Calculator
This TV viewing distance calculator answers the two questions every TV buyer asks: what size TV should I get for the distance to my sofa, and how far away should I sit from the TV I already have. It uses the viewing-angle guidelines from the film and home-cinema industry, where the screen should fill roughly 30° to 40° of your horizontal field of view.
Choose a 30° angle (the SMPTE guideline) for comfortable mixed viewing like news and sport, 36° for a balanced home-cinema feel, or 40° (THX’s immersive recommendation) if you mainly watch films or play games. The calculator also shows the distance within which a normal eye can resolve every pixel at 1080p, 4K or 8K, so you can tell whether a higher resolution is worth paying for at your seat.
Measure from your eyes to the screen, not from the wall. All calculations assume a standard 16:9 widescreen TV. The 30°–40° range is an industry viewing guideline, not a medical rule, and the full-detail distance assumes 20/20 vision (resolving about one arcminute); many people with good eyesight resolve finer detail, so treat it as a conservative estimate.
With the default inputs, the recommended tv size for your seat is 72 in. Change any value above to recalculate instantly.
How to use the tv viewing distance calculator
- 1Measure from where your eyes will be to the TV wall, in feet.
- 2Enter the size of your current or planned TV.
- 3Pick the viewing experience — comfortable, balanced or immersive.
- 4Choose the TV’s resolution to see the full-detail distance.
- 5Use the recommended size and distance range to pick your TV or arrange seating.
Formula and method
A TV fills a horizontal viewing angle θ when you sit at a distance where half its width W subtends θ/2. Rearranging tan(θ/2) = (W/2) ÷ distance gives the ideal distance, and reversing it gives the TV width for a given seat. A 16:9 screen’s width is 0.8716 × its diagonal, which converts width back to the advertised size.
The full-detail distance uses the 20/20 vision limit of about one arcminute (60 pixels per degree): each pixel (screen height ÷ vertical lines) must subtend at least one arcminute for your eye to see it. Beyond that distance, neighbouring pixels blur together for a 20/20 viewer. A recent NIH-indexed study measured an average of about 94 pixels per degree in young observers with healthy eyes, so sharper-sighted viewers can benefit from higher resolution from somewhat farther away.
- θ
- Horizontal viewing angle (30°, 36° or 40°)
- W
- Screen width (inches)
- H
- Screen height (inches)
- lines
- Vertical resolution (1080, 2160 or 4320)
Worked examples
Sofa 8 ft away, 65-inch 4K TV, balanced viewing
At 8 ft (96"), a 36° angle calls for a screen 96 × 2 × tan 18° ≈ 62.4" wide, which is about a 72" TV. A 65" TV is best watched from 6.5–8.8 ft, so an 8 ft seat is within the recommended range. With 20/20 vision you would need to sit within about 4.2 ft to see every 4K pixel.
7 ft room, 55-inch TV, comfortable viewing
Using the SMPTE 30° guideline, 7 ft suits a TV of about 52". A 55" screen fits the 5.5–7.5 ft range, so this setup is well matched.
Immersive movie room, 10 ft, 85-inch TV
For a THX-style 40° angle at 10 ft you would want about a 100" screen. An 85" TV gives that immersion from about 8.5 ft and stays comfortable out to 11.5 ft.
Frequently asked questions
What size TV should I get for my room?+
Measure your seating distance in inches and multiply by about 0.75 for a balanced 36° view (or 0.62 for a relaxed 30° view). At 9 ft (108"), that points to a TV of roughly 65–80 inches.
How far should I sit from a 65 inch TV?+
For a 65-inch 16:9 TV, the 30°–40° guideline puts the ideal seat between about 6.5 and 8.8 feet from the screen, with around 7.3 feet giving a balanced home-cinema view.
Does 4K let you sit closer to the TV?+
Yes. Higher resolution makes pixels smaller, so you can sit closer before the image looks grainy. On a 65-inch 4K TV you see full detail within about 4.2 feet, versus about 8.5 feet for 1080p.
What is the THX recommended viewing angle?+
THX recommends the screen fill about 40° of your horizontal field of view for an immersive cinema experience. SMPTE’s guideline of at least 30° is a more relaxed minimum for everyday viewing.
Can a TV be too big for a room?+
A TV is too big when it fills much more than 40° of your view — you have to move your eyes or head to follow action, which can be tiring. Moving the seat back or choosing a smaller size fixes it.