TV Mount Height Calculator

How to use this tool

1. Pick the room. Nine presets, each carrying a seated eye height and a typical viewing distance. Living room and home office use the eye-level rule; classroom and bar switch to the sightline rule, where the bottom edge is pinned high enough to see over the row in front instead of being centred on anyone's eye line.
2. Enter your screen size, then correct the eye height. The preset is a starting point. Sit where you actually watch, have someone measure floor to your eyes, and type that number in — it is the single input that most changes the answer. Everything recalculates as you type. There is no Calculate button.
3. Open the bracket-offset panel before you drill. Hang the TV brackets on the wall plate, measure the gap between the two centres, then measure the gap between the bracket centre and the TV's own centre. Those two numbers turn the screen-centre figure into the line you actually pencil on the wall. Then hit Download drill guide for a one-page PDF with every mark and a pre-drill checklist, or Share these numbers to copy a link that reopens with all your settings.

Why this tool is different from other TV mount height calculators

Every calculator on this topic answers a question that stops one step short of the job. They tell you where the centre of the screen goes. Then you stand at the wall holding a mount whose wall plate does not line up with the screen centre, and the number you were given is not the number you can mark. Here is what this one adds:

• The wall-plate mark, for any brand of mount. Two optional measurements convert the screen centre into the line you pencil. The one manufacturer tool that outputs mount holes only works if you bought that manufacturer's mount; the one page that explains the offset problem properly has no calculator at all.
• A comfort verdict scored against published limits. The result is checked against the THX 15° maximum to the screen centre and the SMPTE 35° maximum to the top of the screen, and it tells you which one you broke. Most calculators return a number with no opinion about whether that number is any good.
• Sightline rooms, not just sofas. Classrooms, bars, and conference rooms do not use the eye-level rule at all. This tool switches rules with the preset instead of pretending one formula covers a living room and a lecture hall.
• A live side-view diagram. Floor, eye line, sight line, and the panel drawn at its actual tilt, redrawn on every keystroke. Numbers alone do not tell you that a mount is going to feel wrong; a picture does.
• A printable drill guide. One page with every mark, the tilt call, and a five-step pre-drill checklist. Nobody else ships a printable, and this is the one job where you want paper in your hand rather than a phone balanced on a stepladder.
• An embeddable widget. Installers, AV consultants, facilities managers, and home-theatre bloggers can drop the whole calculator on their own page with one line of HTML. None of the current page-one results offer an embed.

How this tool works (the math)

A screen's panel height follows from its diagonal and aspect ratio by plain trigonometry. A rectangle with diagonal d and ratio W:H is d × H / √(W² + H²) tall, which for a 16:9 TV works out to 0.490261 × d. A 65-inch TV is 31.87 inches tall, and that is why the bottom edge moves as screens get bigger while the centre stays put.

For an ordinary room the screen centre sits at your eye level, adjusted for how far above the horizon your eyes rest when you are relaxed:

C = E + D × tan(θ)

where E is your seated eye height, D is the horizontal distance to the wall, and θ is your resting gaze angle — zero when you sit upright, larger when you recline. Sitting upright the whole second term vanishes and the centre is simply your eye height, which is where the familiar "42 inches" rule of thumb comes from.

Rooms with rows of viewers use a different rule entirely. There the bottom edge is pinned so the back row sees over the front row, and the centre falls out of that:

C = B_min + h/2

The edges, the angles, and the tilt then follow:

B = C − h/2 · T = C + h/2 · ε = atan((C − E) / D) · ε_top = atan((T − E) / D) · tilt = round(ε)

The verdict scores ε against the THX 15° comfort maximum and ε_top against the SMPTE 35° maximum. Both are checked, because a mount can clear one and fail the other — that is exactly what happens above a fireplace in a small room.

Finally, the wall-plate mark:

W = C + n − m

where m is how far the bracket centre sits above the wall-plate centre and n is how far it sits above the TV's centre, both signed. With an aligned mount both are zero and the mark is just the screen centre.

Cross-validated against four independent published sources and matching every one to their own rounding: a major calculator's worked 65-inch example (centre 58.64", bottom 42.71") reproduces exactly, another's default 60-inch readout (bottom 27.29" at a 42" centre) reproduces exactly, an AV integrator's living-room figures for a 65-inch panel land at 26.07" and 57.93" against their published ~26 and ~58, and a professional installer's whole size chart from 43 to 85 inches lands inside their rounding. Twenty-five test fixtures run on every build; if any of them drifts, the site does not build.

Three real mounts, run through the tool

A 65-inch TV over a standard sofa

The default case, and the one most people are actually searching for. A 65-inch 16:9 panel is 31.87 inches tall. Sitting upright on a sofa nine feet back with your eyes 42 inches off the floor, the centre goes at 42 inches, the bottom edge at 26.1, and the top at 57.9. Your eyes look up 8.4° to the top of the screen, comfortably inside both limits, and no tilt is needed — a flat fixed mount is fine. Note the bottom edge: at 26 inches it will sit just above a typical 24-inch media console, which is exactly why the "float it above the furniture" instinct pushes so many installs too high.

The same TV above a fireplace

Put that 65-inch panel at a 68-inch centre because the mantel forces it, and sit 55 inches back in a small room. Your eyes now look up 25.3° to the centre and 37.6° to the top, which is past the SMPTE 35° maximum. The verdict turns red and the tool tells you the centre would have to come down to about 56.7 inches to be comfortable. A 25° down-tilt helps the picture geometry but does not fix the neck angle, which is the honest answer most fireplace guides avoid giving. Moving the seating back is the cheaper fix than a pull-down mount.

A display in a home office, where this is really a monitor problem

Switch to the home-office preset and the numbers change more than people expect: eye height drops to 40 inches because a task chair sits lower than a sofa, and the distance drops to 60 inches because you sit close. A 43-inch panel then centres at 40 inches with the bottom edge at 29.5. The same eye-level rule governs an ordinary monitor, and most monitors ship on a stand two to four inches too short to reach it — which is what a monitor arm or a monitor stand exists to fix. If your eye height is the thing that is wrong rather than the screen, an office chair with real seat-height travel moves you instead of the display.

Frequently asked questions

How high should a 65-inch TV be mounted?

Centre the screen at your seated eye level, which is about 42 inches from the floor on a standard sofa. For a 65-inch 16:9 panel that puts the bottom edge at roughly 26 inches and the top at roughly 58. The screen size does not change the centre height at all — it only changes where the edges land, which is why a 43-inch and an 85-inch TV in the same room share a centre line but have bottom edges ten inches apart.

Does the TV size change the mounting height?

Not the centre, no. Your eye level sets the centre and your eye level does not care how big the TV is. What changes is the bottom edge, which drops as the panel gets taller: 31.5 inches on a 43-inch set, 26 on a 65, 21 on an 85, all at the same 42-inch centre. On very large panels that bottom edge can end up low enough to sit behind a console, which is the one legitimate reason to nudge the centre up an inch or two.

Why is the wall-plate mark different from the screen centre?

Because on most mounts the brackets that bolt to the TV do not sit level with the plate that bolts to the wall, and the brackets often do not sit level with the TV's own centre either. Both gaps shift the plate relative to the screen. Measure them once with the brackets hooked onto the plate and the tool corrects the mark. If you skip it and mark the screen-centre number, the TV ends up off by the sum of those two offsets, which on common mounts is anywhere from one to seven inches.

How high is too high to mount a TV?

Two published limits bracket it. THX recommends no more than 15° from your eyes up to the centre of the screen. SMPTE recommends no more than 35° up to the top of the screen. This tool checks both and names whichever one you broke. As a rough guide, at ten feet back a 15° elevation is about 32 inches above your eye line, so a centre much past 74 inches is going to be tiring no matter what the room looks like.

Should I tilt the TV instead of mounting it lower?

Tilt fixes the picture, not your neck. Angling the panel down means you see the screen square-on rather than from below, which helps contrast and off-axis colour on most panels. It does nothing about the fact that your head is tipped back. Use tilt for fine adjustment and for mounts that genuinely cannot come lower; do not use it to justify an extra foot of height. The tool recommends a tilt whenever the elevation reaches 5°, and it tells you a fixed bracket will not do it.

Related tools

• Monitor Size Comparison — compare up to three displays visually with real width, height, PPI, and a desk-fit verdict. The same diagonal-to-height geometry, aimed at whether the screen fits rather than how high it goes.
• Printable Graph Paper — eight grid types for sketching a wall elevation before you commit to a layout.
• Daily Schedule Template — hour-by-hour planner PDF in four layouts.
• Browse all free tools by Sarah Chen →

Sarah's picks for getting screens to the right height

A TV goes up once and stays there. The screen you look at every working day is the one worth spending on, and it is governed by the identical eye-level rule:

• Best Monitor Arms — the fastest way to put a display's centre at eye level and keep it there. Gas-spring arms hold position through the full height range instead of sagging, and clamping to the desk edge returns the footprint the stand was eating. The roundup separates single-monitor arms, dual arms rated for 30 lb+, and models with USB passthrough.
• Best Monitor Stands — the simpler fix when you need two to four inches and nothing else. A fixed riser also opens storage underneath for a keyboard, a document holder, or a hub. Covers fixed risers, height-adjustable stands, and dual-monitor decks.
• Best Office Chairs — when the screen is fine and your eye height is the problem. Real seat-height travel plus a seat pan that lets you sit back changes your eye line by several inches, which is often the whole gap. The roundup is organised by body size and price tier.
• Best Standing Desks — the option that moves your eyes rather than the display, and the right answer if one screen has to serve both a seated and a standing eye level. Electric and manual-crank models at three desk widths.

Methodology & sources

• Panel height from diagonal — universal trigonometry. A rectangle with diagonal d and ratio W:H is d × H / √(W² + H²) tall.
• Eye-level mounting height — C = E + D × tan(θ), the published equation from Omni Calculator's TV mounting height calculator, reproduced here including their worked 65-inch example.
• Sightline mounting height — minimum bottom-edge convention for rooms with rows of viewers (classroom ≥ 54", bar and restaurant ≥ 60"), per Key Digital's published room table and reconciled against Express Mounting's room chart.
• Bracket-offset correction — generalised from Kanto Mounts' two-step wall-plate method into one signed equation, W = C + n − m.
• Comfort limits — the THX 15° maximum viewing angle to screen centre and the SMPTE 35° maximum to the top of the screen. Both are checked independently.
• Cross-validated against Omni Calculator, Inch Calculator, Key Digital, and Express Mounting, matching each to their published rounding. Twenty-five test fixtures run on every build via scripts/validate-tool-fixtures.mjs. Drift = build fails.

Before you drill: these heights are a starting point, not a stud location. Always anchor into framing or use hollow-wall hardware rated above the combined weight of the TV and mount, check your mount's own template against these numbers, and confirm the bracket clears any soundbar, console, or mantel before the first hole goes in. About Sarah Chen · Last reviewed September 11, 2026.

Embed this tool on your site

Free for AV installers, home-theatre bloggers, facilities and IT teams, interior designers, and anyone writing a mounting guide. Required attribution is included in the snippet. No fee, no signup, no analytics attached to the embed.

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