Screen size is the decision people agonize over most and regret least when they go bigger. The useful question isn’t “how big a TV can I afford?” but “how much of my view should the screen fill from where I sit?” This calculator answers that from your seating distance using the same viewing-angle guidelines the film and TV industry uses, then tells you how wide the TV actually is and where to mount it.
TV Size & Viewing Distance Calculator
Measure from your eyes in your usual seat to the wall or stand where the TV will go.
How It Works: Viewing Angle
The calculator works from viewing angle: how wide the screen looks from your seat, in degrees. Two widely used guidelines set the range:
- SMPTE (the Society of Motion Picture and Television Engineers) recommends the screen fill at least 30° of your field of view. For a 16:9 TV that means a seating distance of about 1.6 times the screen diagonal or less.
- THX recommends about 40° for a cinema-like experience, about 1.2 times the diagonal.
The calculator recommends the common screen size closest to the middle of that range, about 1.5 times the diagonal, and rounds up when you are between sizes. 4K matters because at 1080p you can see the pixel structure if you sit closer than about 1.6 times the diagonal, so 1080p results are capped at a smaller size.
TV Size by Viewing Distance (4K)
| You Sit About | Minimum (30°) | Sweet Spot | Immersive (40°) |
|---|---|---|---|
| 6 ft | 44″ | 50″ | 60″ |
| 7 ft | 52″ | 55″ | 70″ |
| 8 ft | 59″ | 65″ | 80″ |
| 9 ft | 66″ | 75″ | 90″ |
| 10 ft | 74″ | 77–83″ | 100″ |
| 12 ft | 88″ | 98″ | 120″ |
Most living rooms we deliver to have the sofa 8 to 10 feet from the TV wall, which is why 65″ and 75″ sets have become the default. If you sit at an angle or the room is used for daytime TV with the lights on, the smaller end of the range is fine.
Actual TV Dimensions
The size on the box is the screen diagonal. The width is about 87% of that and the height about 49%, plus a slim bezel. That is what you need to check against a cabinet, a wall between windows, or a stand.
| Class Size | Approx. Width | Approx. Height (no stand) |
|---|---|---|
| 43″ | 38–39″ | 22–23″ |
| 50″ | 44–45″ | 25–26″ |
| 55″ | 48–49″ | 28″ |
| 65″ | 57–58″ | 33″ |
| 75″ | 66–67″ | 38″ |
| 85″ | 74–75″ | 43″ |
Always confirm on the spec sheet. Also check where the feet go: many TVs now put them near the outer edges, so the stand has to be nearly as wide as the TV even if a center pedestal would have fit.
How High to Mount a TV
For seated viewing, the center of the screen should be close to eye level, which is about 40 to 42 inches from the floor on a typical sofa. The calculator tells you where the bottom edge lands for your size. Mounting over a fireplace usually puts the screen 20 or more inches above that, which is why people end up with sore necks; if you must, a pull-down mount helps. For bedrooms where you watch lying down, a little higher and tilted down is fine.
Frequently Asked Questions
What size TV should I get for 8 feet away?
At 8 feet, a 4K TV between about 59 and 80 inches looks right, and 65 inches is the sweet spot for most people. If you watch a lot of movies in a dim room, 75 inches is not too big.
How far should you sit from a 65-inch TV?
For a 4K 65-inch TV, about 6½ to 9 feet works, with roughly 8 feet being the sweet spot. You can sit as close as about 6½ feet without seeing pixels.
Is a TV too big for my room?
Usually not. If the screen fills more than about 40 degrees of your view, it starts to feel like the front row of a theater, and you have to move your eyes to follow action. For a 75-inch TV that only happens closer than about 7½ feet.
Does 4K let you sit closer?
Yes. A 4K screen has four times as many pixels as 1080p, so you can sit at about 1.2 times the diagonal before the image looks soft, compared with about 1.6 times for 1080p.
How high should a TV be mounted?
Put the center of the screen at about seated eye level, roughly 40 to 42 inches from the floor. For a 65-inch TV that puts the bottom edge around 25 inches off the floor.