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Calculate the recommended TV installation height based on screen size, viewing distance, and seated eye level for comfortable viewing.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This calculator turns a TV diagonal, screen aspect ratio, seated eye height, viewing distance, viewing angle, and mount offset into screen and mounting measurements. Enter the diagonal in inches. Enter eye height, viewing distance, and mount offset in centimeters; enter the viewing angle in degrees. The three selectable aspect ratios are 16:9, 4:3, and 21:9.
The screen dimensions are derived from the diagonal and the selected ratio. If the ratio is W:H and the diagonal is D, screen height = D × 2.54 × H ÷ √(W² + H²) centimeters, and width uses W in place of H. The center height is seated eye height + viewing distance × tan(angle). The top and bottom edges are the center height plus or minus half the screen height. Mount center height adds the entered offset to the screen center.
Results include the TV’s calculated width and height, screen center, top and bottom edges, and mounting center. The “mount offset” is the distance between the screen center and the mount center; use a positive or negative value according to the mount’s measured position. A displayed center-height range is calculated using angles of −10° and +10° around eye height and the entered viewing distance.
For example, a 65-inch 16:9 screen is about 80.9 cm tall. With eye height 105 cm, distance 280 cm, angle 0°, and offset 0 cm, the screen center and mount center are 105 cm; the bottom is about 64.6 cm and the top about 145.4 cm. These are geometry outputs for the values entered, not a universal placement rule.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Use the manufacturer’s diagonal size in inches, measured corner to corner. Select the screen ratio that matches the display.
Enter eye height in centimeters from the floor to your eyes in your normal viewing position. Enter the approximate horizontal viewing distance in centimeters.
Angle is in degrees and changes the calculated center height through the tangent formula. Offset is in centimeters and shifts only the mount-center result relative to the screen center. Keep both at zero for a level, aligned starting calculation.
Use top and bottom heights to check the screen footprint, then use mount center height to locate the mount’s center. Adjust the inputs and compare again if your planned position or hardware differs.
Use cases
See how the tool fits into real work and everyday tasks.
Measure eye height from the sofa and the distance to the TV wall. The calculated edge heights help you check the screen against a console before drilling.
Keep the diagonal and viewing position fixed, then compare 16:9, 4:3, or 21:9 screen dimensions. This helps reveal how the aspect ratio changes the top and bottom edges.
Measure the mount’s center relative to the TV screen center and enter that offset. The separate mount-center result can then help translate a desired screen position into a hardware reference point.
Q&A
Find concise answers to common questions and confusing cases.
No. The size field is the diagonal in inches. The selected aspect ratio is used to calculate width and height.
It moves the calculated center up because the formula adds distance × tan(angle) to eye height. A negative angle moves it down.
Only when the mount offset is zero. The tool adds the offset to the screen center to calculate mount center.
Notes
Review scope, result limitations, and important precautions before use.
The calculator is a geometric estimate based on the entered dimensions and angle. Its displayed ±10° interval is a calculated range, not a medical or ergonomic standard. It does not check the wall, studs, fasteners, mount compatibility, manufacturer clearance requirements, or electrical work. Verify those separately with the mount and TV instructions and the conditions at your installation site. The output is in centimeters even when TV diagonal is entered in inches.
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