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TV Mount Height Calculator

Work out exactly how high to mount your TV so the screen sits at eye level when you are seated.

Result

110.0 cm
75.8 cm
144.2 cm
68.5 cm

How it is calculated

The tool assumes a 16:9 screen. Screen height is the diagonal times 9/√337, because the diagonal of a 16:9 rectangle is √(16²+9²) = √337 times the unit width: H = D × 2.54 × 9 / √337, with D in inches and H in cm. The screen centre is placed at your seated eye level E (cm from the floor), so bottom = E − H/2 and top = E + H/2. Results are rounded to one decimal. If the bottom edge would fall below the floor, it is shown as 0.0 cm, but the centre and top are not adjusted.

Worked example

For a 55-inch TV and an eye level of 110 cm: 55 × 2.54 = 139.7 cm diagonal. Multiplying by 9/√337 (about 0.4903) gives a screen height of 68.5 cm. Half of that is about 34.2 cm. The centre sits at 110.0 cm, the bottom edge at 110 − 34.2 = 75.8 cm, and the top edge at 144.2 cm from the floor.

Try this example →

Common mistakes

  • Measuring eye level while standing; the input is your seated eye height measured from the floor, in cm.
  • Entering the diagonal in centimetres; the field is in inches, so 140 would be read as a 140-inch screen.
  • Using the result for an ultrawide or 4:3 screen; the height is computed only for 16:9.
  • Treating the bottom figure as the bracket position; it is the lower edge of the screen, so the mount holes sit higher, depending on the bracket.

About this calculator

This calculator centers your TV screen on your seated eye line — the height ergonomists and home theater installers recommend for comfortable viewing without neck strain. It starts from the screen's diagonal size and aspect ratio to work out the actual screen height, then positions the screen's vertical center at your eye level when seated, which is typically 42–48 inches (107–122 cm) off the floor on a standard sofa, adjusted for your own measurements.

Home theater installers and TV-mounting professionals use this same eye-level rule as their starting point before accounting for glare, wall studs, and viewing distance, and it's the calculation homeowners reach for before drilling into drywall — since a TV mounted too high is one of the most common and hardest-to-fix installation mistakes.

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