TV viewing distance: how far to sit for every screen size
For a 55-inch TV the usual advice puts your eyes 1.7 to 2.3 m from the screen. This article shows where those numbers come from, so you can also work backwards: given the distance from your sofa, which TV size fits?
The method: how much of your view the screen fills
Home-cinema guidance is usually stated as a viewing angle, the horizontal angle the screen fills from where you sit. Two figures are commonly cited: about 30 degrees as a comfortable minimum and about 40 degrees for a more immersive picture. A smaller angle means sitting farther back.
The distance follows from the screen width: distance = width ÷ (2 × tan(angle ÷ 2)). The width of a 16:9 screen is 87.16% of its diagonal, which how to measure a TV screen explains step by step.
These figures match the simple rule of 1.2 to 1.6 times the diagonal: for a 55-inch TV the diagonal is 139.7 cm, and 1.2 to 1.6 times that is 1.7 to 2.2 m.
Viewing distance by TV size
Working backwards: which TV size fits your sofa distance
Measure from your eyes to the wall or cabinet the TV will stand on, then read across.
| Distance to the screen (m) | Largest size at 40° (inches) | Size at 30° (inches) |
|---|---|---|
| 1.5 | 49 | 36 |
| 2 | 66 | 48 |
| 2.5 | 82 | 61 |
| 3 | 99 | 73 |
| 3.5 | 115 | 85 |
| 4 | 132 | 97 |
How to use the numbers
- Pick a size between the two columns. At 3 m the table gives roughly 73 to 99 inches, so a 65 or 75-inch TV is a safe choice and an 85-inch is at the immersive end.
- If the room is a bedroom, where you sit close and often lie down, lean to the smaller TV in the range.
- Your own comfort matters more than any rule. Sit where you normally sit and picture the screen width: it should be easy to see the whole picture without turning your head.
- The figures describe 16:9 TVs. Ultrawide monitors have a different width for the same diagonal.
Common mistakes
The first is measuring from the wall to the wall. The distance that counts is from your eyes to the screen, which is a little less if you sit forward on the sofa.
The second is choosing by price per inch alone. A 65″ TV at 2 m is 143.9 cm wide and fills a lot of your view, while the same TV at 3 m looks well proportioned.
The third is forgetting that the TV must also fit the furniture: check how wide the stand needs to be and, if you mount it, the right mounting height.
Related guides
Compare any two sizes in the TV size chart, convert a size with the inches to cm converter, or see the popular models in cm: 43″, 50″, 55″, 65″. Planning a purchase? Read the Black Friday 2026 size guide, and for sets above 70 inches see 75 and 85 inch TVs in cm.
Frequently asked questions
How far should I sit from a 55 inch TV?
About 1.7 to 2.3 m, using the 40° and 30° viewing angles.
How do I calculate TV viewing distance?
Divide the screen width by twice the tangent of half the viewing angle. For a 30° angle that is width ÷ 0.536.
What TV size for a 3 meter viewing distance?
Roughly 73 to 99 inches, so a 65 to 85-inch TV fits well.
Is the 1.2 to 1.6 times diagonal rule accurate?
It is a good approximation: it matches the 40° and 30° viewing angles for a 16:9 screen.
Does sitting closer to a TV hurt your eyes?
There is no evidence that normal viewing distances cause lasting harm, but a screen that fills too much of your view is tiring. Choose a distance that lets you see the whole picture comfortably.
Related articles and tools
- What height to mount a TV on the wall (in cm, by TV size) Where to place a wall-mounted TV: the center height, bottom edge and top edge in cm for 43 to 85 inch TVs, plus space for brackets and soundbars.
- 75 and 85 inch TV size in cm: width, height and the space you need A 75 inch TV is 166 cm wide and an 85 inch TV 188 cm wide
- How to measure a TV screen size: diagonal, width and height A 55 inch TV is not 55 inches wide
- How wide should a TV stand be? Width in cm for every TV size Find the minimum TV stand or cabinet width in cm for 32 to 85 inch TVs, plus wall-mount space, foot spacing and the clearance rules most people forget.
- Black Friday 2026 TV size guide: what 55, 65 and 75 inches mean in cm Shopping for a TV before Black Friday on 27 November 2026? See what 43, 55, 65 and 75 inch TVs measure in cm, and a checklist to avoid buying a set that does not fit.
- A4 vs US Letter: exact sizes in inches, mm and cm, and how to print A4 is 210 × 297 mm and US Letter is 8.5 × 11 in
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