Quick answer
The bottom edge of the TV = eye height − screen height ÷ 2. With a seated eye height of 42 in and a 26.96 in tall screen, the bottom edge sits at 28.52 in and the top at 55.48 in.
Enter the diagonal, aspect ratio and seated eye height. The calculator returns the bottom edge and top heights. Use this tv mounting height calculator to check your own figures.
Related tools: TV Height Calculator: Screen height from diagonal and aspect ratio. 16:9 Aspect Ratio Calculator: The missing dimension for a 16:9 frame. Resolution Scale Calculator: Scaled resolution at a percentage.
How to use the TV Mounting Height Calculator
- Enter screen diagonal (in) (above 0).
- Enter aspect ratio width (above 0). It starts at 16.
- Enter aspect ratio height (above 0). It starts at 9.
- Enter seated eye height above the floor (in) (above 0).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Screen diagonal | A number, in in | > 0 |
| Aspect ratio width | A number | > 0, starts at 16 |
| Aspect ratio height | A number | > 0, starts at 9 |
| Seated eye height above the floor | A number, in in | > 0 |
Formula and method
Formula
bottom edge = eye height − screen height ÷ 2
IEEE-754 double precision; shown to the decimals indicated.
Centers the screen on your seated eye level; many people prefer it slightly lower.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Screen diagonal = 55; Aspect ratio width = 16; Aspect ratio height = 9; Seated eye height above the floor = 42.
| Result | Value |
|---|---|
| Bottom edge height | 28.52 in |
| Top of screen | 55.48 in |
Example 2
Inputs: Screen diagonal = 65; Aspect ratio width = 16; Aspect ratio height = 9; Seated eye height above the floor = 40.
| Result | Value |
|---|---|
| Bottom edge height | 24.07 in |
| Top of screen | 55.93 in |
The first line is the headline result (bottom edge height). Below it the tV Mounting Height Calculator lists top of screen, which describe the same case from other angles. IEEE-754 double precision; shown to the decimals indicated.
The logic
Centering the screen on your eye line puts the middle at 42 in. Half the height is 13.48 in, so the bottom edge is 28.52 in.
Preference
Many people prefer the centre slightly below eye level to avoid neck strain. Fireplaces mounts are usually too high for comfort.
How the result changes with screen diagonal
Holding every other input at the first worked example, this table changes only screen diagonal. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Screen diagonal | Bottom edge height | Top of screen |
|---|---|---|
| 27.5 | 35.26 in | 48.74 in |
| 55 | 28.52 in | 55.48 in |
| 110 | 15.04 in | 68.96 in |
| 220 | -11.93 in | 95.93 in |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Screen diagonal: entering "0" shows "Screen diagonal must be greater than 0." beside that field and no result.
- Seated eye height above the floor: entering "0" shows "Seated eye height above the floor must be greater than 0." beside that field and no result.
Choosing between the TV Mounting Height Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [TV Height Calculator](/technology/tv-height-calculator/) | screen diagonal, aspect ratio width and aspect ratio height | Screen height |
| [16:9 Aspect Ratio Calculator](/technology/16-9-aspect-ratio/) | Matching size | |
| [Resolution Scale Calculator](/technology/resolution-scale/) | width, height and scale | Scaled resolution |
| [Screen Size Calculator](/technology/screen-size-calculator/) | diagonal, aspect ratio width and aspect ratio height | Screen size |
| [Aspect Ratio Calculator](/technology/aspect-ratio-calculator/) | width and height | Aspect ratio |
Background: networking and display
Network speeds are quoted in bits per second and file sizes in bytes, and a byte is 8 bits, so a 100 Mbps link moves at most 12.5 megabytes per second; real throughput is usually below the advertised rate. Pixel density is the diagonal in pixels divided by the diagonal in inches: a 1920×1080 display of 24 inches is about 92 pixels per inch, and a 3840×2160 display of 27 inches about 163.
Assumptions and limitations
- Preference varies
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for screen diagonal and seated eye height above the floor to confirm this.
Frequently asked questions
What eye height should I use?
Measure sitting on your sofa.
Should the TV tilt?
Tilt helps when mounted high.
Does a bigger TV go higher?
Its centre stays at eye level.
What does the TV Mounting Height Calculator calculate?
Bottom and top edge height to center the screen at eye level. It returns Bottom edge height and Top of screen.
What formula does the TV Mounting Height Calculator use?
bottom edge = eye height − screen height ÷ 2. Centers the screen on your seated eye level; many people prefer it slightly lower.
What do I need to enter in the tV Mounting Height Calculator?
You enter Screen diagonal (in), Aspect ratio width, Aspect ratio height and Seated eye height above the floor (in).
How is the result rounded or limited?
IEEE-754 double precision; shown to the decimals indicated. Preference varies.
What is an example of a tV Mounting Height result?
With screen diagonal 55, aspect ratio width 16, aspect ratio height 9 and seated eye height above the floor 42, the bottom edge height is 28.52 in.
Where does the method come from?
The method follows: Common ergonomic guidance (screen center near eye level).
Related calculators
- TV Height Calculator — Screen height from diagonal and aspect ratio.
- 16:9 Aspect Ratio Calculator — The missing dimension for a 16:9 frame.
- Resolution Scale Calculator — Scaled resolution at a percentage.
- Screen Size Calculator — Width, height and area of a screen from its diagonal and aspect ratio.
- Aspect Ratio Calculator — Simplest aspect ratio of a width and height.
- TV Viewing Distance Calculator — Viewing distance for a chosen horizontal viewing angle.
Sources
- Common ergonomic guidance (screen center near eye level)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.