calcs.homes
calcs.homes
Enter your seated eye height and TV screen size to find where the center of the screen should sit — plus the top and bottom mounting edges.
Estimate only — a reclined viewing angle or wall-mounted swivel arm may call for adjustments.
We calculate screen height from the diagonal using the standard 16:9 aspect ratio: height = diagonal × 9 ÷ √(16² + 9²), which isolates the vertical leg of that ratio. The center of the screen is set at your seated eye height, and the top and bottom mounting edges are that screen height split evenly above and below the center point.
16:9 is the aspect ratio used by virtually all modern flat-screen TVs, so deriving height from the diagonal this way works without needing you to look up your specific model's dimensions. Centering the screen at seated eye level is the ergonomic standard for TV placement because it lets you watch with a level, straight-ahead gaze — mounting higher, common over a fireplace, forces your neck to tilt upward for extended periods, a common source of strain.
Center the screen at your seated eye height — commonly around 42 in (107 cm) from the floor for a standard sofa, though this varies with your specific seating. Enter your own eye height above for a tailored answer.
Mounting above eye level is common over a fireplace but causes neck strain during long viewing — a tilting or full-motion mount that angles the screen down can help compensate.