TV Mounting Height Calculator
Enter your TV screen size, seated eye level, viewing distance, and preferred tilt angle to find the perfect mounting height. The calculator shows center-mount height, the bottom edge height (so you know where to drill), and the top edge, all in real time. Switch between inches and centimetres with one click.
How the formula works
The ideal center-mount height is based on three things: your seated eye level, how far you sit from the screen, and the angle at which your eyes naturally rise toward the TV. The formula is: Center Height = Eye Level + Viewing Distance x tan(Tilt Angle). When the tilt angle is 0 degrees, the TV center sits exactly at eye level. A 10-degree upward gaze - often comfortable for living rooms where the screen is slightly above a media console - shifts the center upward by the horizontal distance times the tangent of 10 degrees (about 18% of the viewing distance). The screen height is calculated from the diagonal using the 16:9 ratio: Screen Height = 9 x diagonal / sqrt(337). The bottom edge is the center height minus half the screen height, and the top edge is the center height plus half the screen height.
SMPTE and THX viewing angle standards
Two widely cited standards govern how much of your field of view the screen should fill. The Society of Motion Picture and Television Engineers (SMPTE) recommends a horizontal viewing angle of 30 degrees, meaning the screen should subtend roughly 30 degrees across your visual field. For a 55-inch TV, this puts the ideal distance at about 8 to 9 feet. The THX standard recommends 40 degrees for home theater setups, producing greater immersion and working out to a shorter distance for the same screen size. The recommended viewing distance formula is: Distance = (Screen Width / 2) / tan(Viewing Angle / 2). Neither standard specifies the vertical mount height directly - that depends on your eye level and how much upward gaze you find comfortable. Combine both calculations for a complete setup.
Common mounting mistakes and how to avoid them
Mounting a TV too high is the most common mistake in home installation. A TV centered at 65 inches or more forces the head into sustained neck extension, and over a two-hour movie this causes real discomfort. The typical culprit is hanging the TV high on the wall "because it looks nice" or placing it above a fireplace where the mantle dictates the height. If a fireplace forces a high position, a full-motion tilting bracket that angles the screen downward can partly compensate: the physical center stays high but the on-screen content tilts toward a better line of sight. A second common error is mounting too close to a corner, which limits the available tilt range and can reflect light. Check the swing radius of the bracket arm before drilling. Finally, always locate the wall studs or use rated anchor bolts for the combined weight of the TV and bracket: most wall mounts specify a stud-mount requirement, and plasterboard anchors alone are rarely sufficient for screens over 40 inches.
Mounting above a fireplace: what you need to know
Placing a TV above a fireplace is popular because the mantle provides a natural visual anchor, but it creates two problems. First, the height is almost always too high for comfortable viewing - most mantles sit at 48 to 56 inches, which pushes the TV center up to 65 to 80 inches. Second, heat and soot from the firebox can shorten the TV's lifespan. For gas fireplaces with top vents, heat concentration directly above the firebox is a real concern. Use the furniture height input in this calculator to see how much clearance your TV bottom would have above the mantle. If the bottom edge is below the mantle, the mount position is physically impossible. If the center height comes out above 65 inches, consider a recessed-wall installation that lets the TV sit lower in the wall, or use a ceiling-tilt mount that can be tilted steeply downward.
TV size to recommended mount height (42-inch seated eye level, 10-degree tilt)
| TV size (diagonal) | Screen height | Center height | Bottom edge | Top edge |
|---|---|---|---|---|
| 32 in | 16 in | 59 in | 51 in | 67 in |
| 40 in | 20 in | 59 in | 49 in | 69 in |
| 43 in | 21 in | 59 in | 49 in | 70 in |
| 50 in | 25 in | 59 in | 47 in | 72 in |
| 55 in | 27 in | 59 in | 46 in | 73 in |
| 65 in | 32 in | 59 in | 43 in | 75 in |
| 75 in | 37 in | 59 in | 41 in | 78 in |
| 85 in | 42 in | 59 in | 38 in | 80 in |
Approximate center-mount heights for common TV sizes assuming a 42-inch seated eye level, 96-inch (8 ft) viewing distance, and 10-degree upward gaze. Adjust with the calculator for your exact setup.
Frequently asked questions
What is the ideal height to mount a 55-inch TV?
For a seated eye level of 42 inches (the common average) and a 10-degree comfortable upward gaze at an 8-foot viewing distance, the center of a 55-inch TV should be at about 59 inches from the floor. The bottom edge lands at around 46 inches and the top at 73 inches. Enter your exact measurements in the calculator above for a result tuned to your room.
Should the TV center be at eye level?
Eye level is the ergonomic ideal when the tilt angle is 0 degrees. In practice, a gentle upward gaze of 5 to 15 degrees is tolerated comfortably and often looks better aesthetically. Angles above 20 degrees, however, cause neck extension and become uncomfortable during long viewing sessions. The calculator lets you set any tilt angle and shows the resulting mount height.
How far should I sit from a 55-inch TV?
The SMPTE standard (30-degree horizontal viewing angle) puts the ideal distance for a 55-inch TV at about 95 to 100 inches (8 feet). The THX standard (40 degrees, more immersive) shortens that to roughly 70 to 75 inches (6 feet). Use the viewing angle dropdown in the calculator to see the recommended distance for your screen size and preferred standard.
Can I mount a TV above a fireplace?
You can, but the height is usually too high for comfortable viewing and heat from a wood-burning or poorly vented gas fireplace can damage the panel. Use the furniture height input to check clearance, and consider a steeply tilting bracket to bring the on-screen image closer to your eye line. If the center height calculation puts the screen center above 65 inches, you are in a zone that most viewers find uncomfortable for sessions longer than an hour.
What does the bottom edge height tell me?
The bottom edge height is the most useful measurement for the person drilling the wall: it tells you exactly where the lowest point of the screen will sit. Use it to check clearance above a media console, fireplace mantle, or baseboard. It also tells you how high the VESA bracket arms need to be, since most mount brackets are specified by where the plate attaches relative to the screen bottom.
What is the difference between the SMPTE and THX standards?
SMPTE (Society of Motion Picture and Television Engineers) recommends a horizontal viewing angle of 30 degrees, calibrated for broadcast and cinema. THX (Tomlinson Holman's eXperiment) recommends 40 degrees for home theater, producing a more immersive picture. At 30 degrees your screen fills less of your field of view and image flaws are less obvious; at 40 degrees you feel more inside the content but screen defects and pixels become more visible. 4K content tolerates the closer distances better because the higher resolution reduces visible pixel structure.
How is screen height calculated from the diagonal?
All modern TVs use a 16:9 aspect ratio, so if the diagonal is d inches, the screen width is 16k and height is 9k where k = d / sqrt(337). The height works out to about 0.49 times the diagonal: a 55-inch TV has a screen height of roughly 27 inches and a width of roughly 48 inches.