In order to determine the height that the TV should be mounted, we first need to know the size of the TV, the viewing distance from the TV, the eye level height from the floor and the reclining sitting angle. Let me bring some easy to follow formulas and then I will explain them:
Optimum Viewing Distance (OVD) is the distance from where you should be sitting, to the wall of where the TV will be mounted. You can find the VD if you know your TV Size (TVS) from the following formula:
(1)Optimum Viewing Distance (OVD)=TVS*1.82
For example if your TV size (TVS) is 55in then the Optimum Viewing Distance (OVD) should be 100 inches (55*1.82).
Before we can calculate the TV Installation Height (TVIH) we need to measure your Eye Level Height (ELH) from the floor, while you a sitting down on your couch. Once you measure your ELH we can find the TVIH by the following formula:
(2)TV Installation Height (TVIH) =ELH+(OVD*0.22)–To the Midpoint of the TV.
For example when I sit on my couch my ELH from the floor is 39 inches and the OVD is 100 inches (see previous example) so my TVIH is 39+(100*0.22)=61 inches from the floor to the midpoint of the TV. So here is a table:
TV Size (in) Viewing Distance (in) TV Installation Height (in) at ELH=39in
32 58 (4.8ft) ELH+13 about 52 in
37 67 (5.6ft) ELH+15 about 54 in
42 76 (6.4ft) ELH+17 about 56 in
46 84 (7.0ft) ELH+18 about 57in
55 100 (8.3ft) ELH+22 about 61 in
65 118 (10.0ft) ELH+26 about 65 in
70 127 (10.6ft) ELH+28 about 67 in
Formula 1 is based to about 30 degrees of viewing angle that are within the limits of the Society of Motion Picture and Television Engineers, THX and manufacturers’ recommendations for 16:9 HDTV’s.
Formula 2 is based on the average reclining angle of about 12.5 degrees from vertical ( sitting up straight) for casual sitting. Manufacturers range for casual sitting is 10-15 degrees.
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There is no way so,e of those are correct, especially for 4K sets. I’m probably 8ft away from a 65” set and if it were at the recommended height 65” to the center I’d be looking straining my neck look up lol. The set should be eye height which is pretty easy to measure when sitting down in your couch. Then move to your wall and find that same height. Install the TV so the center is at that height. All done. No formula needed.
If you do not recline in your couch then it is the eye height as you said and as the formula states. But if you do sit back then this is the mounting height:
TV Mounting Height Calculator
Your TV Size is=65inches
Your Eye Level Height from the Floor =40inches
Viewing Distance from TV =96inches
Your Mounting Height to the Middle of the TV should be=61inches