01What this calculator tells you
This calculator answers the one question every wall mount comes down to: how high off the floor should the TV go? Pick your room, enter the TV size and your seated eye height, and it returns the bottom-of-screen height you mark on the wall, plus the screen center, the top edge, and — if you add a viewing distance — a SMPTE viewing-angle check. Most people drill to the bottom edge of the screen, so that is the number the result leads with.
The guiding rule, shared by installers and the Consumer Technology Association, is simple: put the center of the screen at your eye level when seated. Everything else — bottom edge, mount holes, tilt — follows from that and your screen size. Planning the wall behind it too? Our wall stud calculator helps you find solid anchor points, and the full set is on our calculators home page.
02Recommended heights by TV size
The table below assumes the common 42″ seated eye level of a living-room sofa and a 16:9 screen. As the TV gets bigger the screen is taller, so the bottom edge sits lower even though the center stays at eye level. Use it as a sanity check against your own calculated number.
03How high is too high?
Height is limited by comfort, not just taste. The Society of Motion Picture and Television Engineers (SMPTE) recommends the vertical angle from your eyes to the top of the screen stay under about 35°; beyond that you tip your head back and invite the neck and upper-back strain the OSHA ergonomics program warns about for any raised display. This calculator flags a pass or fail on that angle once you enter a viewing distance.
The classic problem spot is a TV over a fireplace, where the mantel pushes the center to 48″–60″. A tilting mount angles the screen down toward your eyes and buys back some comfort, but always check two things: the SMPTE angle, and that the mantel surface stays below the TV’s rated operating temperature. The Consumer Product Safety Commission also stresses anchoring the mount into framing to prevent tip-over, which our stud calculator can help you locate.
- Sit where you normally watch and measure floor-to-eye height — that is your target screen center.
- Enter your TV size and eye height above (add viewing distance for the angle check) and press Calculate.
- Mark the bottom-of-screen height the calculator gives you on the wall with a pencil and level.
- Locate the studs, hold the TV or a paper template to the mark, and confirm it feels comfortable before drilling.
A cheap trick pros use: cut a piece of the TV box to the screen size, tape it to the wall at the calculated height, and live with it for an evening. If it feels high, lower it an inch and re-mark. Want your exact numbers? Enter your details in the calculator and hit Calculate.
- Eye height is personal. The 42″ presets are averages; a low modular sofa or a bar stool can shift your real eye level by several inches.
- Screen height assumes 16:9. Ultrawide or older 4:3 panels are proportioned differently, so the derived screen height will be off.
- Tilt is an approximation. The small upward allowance for a tilting mount is a guide, not a substitute for angling the screen at your eyes on the day.
- Always mount into structure. Drywall anchors alone are not rated for a TV — hit the studs or use a rated backing, per CPSC anti-tip guidance.
- Over a fireplace, check heat. Confirm the mantel surface stays under the TV’s rated operating temperature.
04Related calculators
Working through a related project? Try our Dining Room Table Size Calculator, Board and Batten Calculator, and Barndominium Material Calculator.
01The mounting-height formula
The method has two parts: work out how tall a 16:9 screen is from its diagonal, then place its center at your seated eye level and read off the edges.
Where:
- H= the height of the screen itself, in inches.
- diagonal= the advertised TV size (corner to corner), in inches.
- seated eye height= floor to your eyes when seated in your viewing spot.
- distance= eyes-to-wall viewing distance, used for the SMPTE angle check.
02Worked example
Say you have a 65″ TV, sit with a 42″ eye height on the sofa, and view from 9 ft (108″) away on a flat mount. Work it line by line:
So the 65″ TV’s bottom edge goes about 26″ off the floor, with the top of the screen only 8.4° above your eye line — comfortably inside the SMPTE limit. Raise the center toward a fireplace and that angle climbs fast, which is exactly what the check is for.