80-inch TV dimensions, viewing distance and mounting height

How big is a 80-inch TV?

TV sizes are measured across the diagonal of the picture. For a 16:9 screen the width is 0.872 times the diagonal and the height 0.490 times, so a 80-inch screen is 69.7 × 39.2 inches (177 cm × 100 cm), with 19 square feet of picture.

Two things make a real set bigger than its screen. The frame (bezel), usually a few tenths of an inch on each side on current models. The stand adds height and, more importantly, depth. Some manufacturers also sell sets as a size “class”, with a measured diagonal slightly under the nominal size; the dimensions they print for the whole set are what matter for fit.

Very few TVs are sold as 80-inch models. Searches for an 80-inch TV usually come from people sizing a space, so this page gives the dimensions of a true 80-inch 16:9 screen and the real sizes on either side of it: 77- and 83-inch OLEDs and 85-inch LCDs.

An 80-inch screen fills the recommended 30–40° of your view from about eight to eleven feet away.

If 80 inches is the most your wall allows, measure it against real models: a 77-inch OLED is about 67.5 inches wide, an 83-inch about 72.5, and an 85-inch about 74.5.

Current 80-inch TVs

How far to sit from a 80-inch TV

The useful measure is the viewing angle: how much of your view the picture fills. SMPTE’s reference viewing distance gives about 31–33°, and THX’s cinema guideline is 40°. For a 80-inch screen, that band runs from about 8 ft (40°) to 10 ft 10 in (30°), measured from your eyes to the screen.

Resolution sets a second, closer limit. ITU-R BT.1845 and BT.2022 design viewing distances so that each pixel spans about one arcminute, roughly the limit of normal vision: 1.6 picture heights for 4K and 3.2 for 1080p. For a 80-inch screen that is about 5 ft 3 in for 4K and 10 ft 6 in for 1080p, so at normal sofa distances a 4K 80-inch set shows no visible pixel structure, while a 1080p set can look slightly soft if you sit at the near end of the band.

How high to mount a 80-inch TV

For a sofa, aim the center of the screen at seated eye height, about 42 inches from the floor (Samsung’s guidance for an average adult on a typical couch). For a 80-inch TV that puts the bottom edge of the picture about 22 inches from the floor and the top about 62 inches.

If the TV has to go higher, THX suggests keeping your line of sight within 15° of the screen center. The further back you sit, the higher it can go:

Over a fireplace, a 80-inch TV usually ends up with its center well above 60 inches, past 15° from typical seats, and manufacturers warn about heat. Our fireplace guide covers both.

Will a 80-inch TV fit your room?

• Wall: the screen is 69.7 inches wide; the set a little under an inch more. Leave some wall either side, especially next to windows or a door frame.
• Console: design guides suggest a console a few inches wider than the TV, roughly 72–76 inches for a 80-inch set. The hard minimum is the stand width: feet near the edges need almost the full width of the TV.
• Room depth: with the sofa against the back wall, your eyes end up about two feet in front of it. Sitting 8 ft to 10 ft 10 in from a wall-mounted screen needs a room about 11 ft to 14 ft deep, more if the TV stands on a console or there is a walkway behind the sofa (36 inches is the usual minimum, from NKBA’s planning guidelines).
• Suits: family rooms where the sofa is about eight to eleven feet away.

The quickest check is to see it: open a room at your size in Room Studio with a 80-inch TV already on the wall, then drag the sofa to where yours sits.

80 inches compared with other sizes