Everything is worked out in your browser and saved on this device for next time.
About the TV Size Calculator
A TV's size — "55 inches", "65 inches" — is the diagonal of the screen. That does not tell you if it fits your wall, your cabinet or your room. This calculator turns the size into width and height, and shows how far to sit from it.
Or go the other way: type how far your sofa is from the wall, and it tells you the best TV size for that seat.
It runs in your browser. Nothing is uploaded, and your last numbers are saved on this device.
Features
- Width, height and area from the screen size, in inches or centimetres
- Any shape — 16:9 TVs, 21:9 ultrawide, 16:10, 4:3 and 32:9
- Best viewing distance — the cinema (THX) and relaxed (SMPTE) guides
- 4K and 1080p — the closest seat before pixels show
- Seat to size — your distance in, the best TV size out
- Quick sizes — 32" to 98" with one tap, and a table of all of them
TV sizes and dimensions (16:9)
| TV size | Width | Height | Best viewing distance |
|---|---|---|---|
| 32" | 27.9 in (71 cm) | 15.7 in (40 cm) | 3 ft 2 in – 4 ft 4 in (1.0 m – 1.3 m) |
| 43" | 37.5 in (95 cm) | 21.1 in (54 cm) | 4 ft 3 in – 5 ft 10 in (1.3 m – 1.8 m) |
| 50" | 43.6 in (111 cm) | 24.5 in (62 cm) | 5 ft – 6 ft 9 in (1.5 m – 2.1 m) |
| 55" | 47.9 in (122 cm) | 27.0 in (68 cm) | 5 ft 6 in – 7 ft 5 in (1.7 m – 2.3 m) |
| 65" | 56.7 in (144 cm) | 31.9 in (81 cm) | 6 ft 6 in – 8 ft 10 in (2.0 m – 2.7 m) |
| 75" | 65.4 in (166 cm) | 36.8 in (93 cm) | 7 ft 6 in – 10 ft 2 in (2.3 m – 3.1 m) |
| 85" | 74.1 in (188 cm) | 41.7 in (106 cm) | 8 ft 6 in – 11 ft 6 in (2.6 m – 3.5 m) |
| 98" | 85.4 in (217 cm) | 48.0 in (122 cm) | 9 ft 9 in – 13 ft 3 in (3.0 m – 4.0 m) |
How to choose a TV size
- Measure your seat to the wall where the TV will hang or stand.
- Divide by 1.2 to 1.6 (in the same unit): that is the range of good screen sizes. Sitting 9 feet (108 inches) away gives about 68–90 inches.
- 4K helps. With a 4K TV you can sit closer or buy bigger without seeing pixels.
- Check the space. Measure the wall or the cabinet. The TV with its frame is about 1 inch (2–3 cm) wider than the screen.
- Bright room? A slightly smaller screen at the same distance looks less tiring in daylight.
How the numbers are worked out
For a 16:9 screen the width is 0.872 × the diagonal and the height is 0.490 × the diagonal (from Pythagoras: the sides 16 and 9 make a diagonal of 18.36).
Viewing distances follow two common guides: THX recommends a screen that fills about 40° of your view (about 1.2 × the diagonal away), and SMPTE about 30° (about 1.6 × the diagonal). The pixel limits use normal (20/20) eyesight, which sees details of about one minute of arc.
How to use it
- Type the screen size in inches, or tap a size such as 55" or 65"
- Pick the shape if it is not a normal 16:9 TV
- Read the width, height and the best distances
- Or choose My seat → best TV size and type how far you sit from the screen
- Switch inches, feet or cm, m at the top
Frequently asked questions
How do I find the width of a TV from its size?
For a normal 16:9 TV, multiply the size by 0.872. A 65 inch TV is 65 × 0.872 = 56.7 inches wide. The height is the size × 0.490 = 31.9 inches.
What size TV should I get for my room?
Measure from your seat to the screen, then divide by 1.2 (cinema feel) to 1.6 (relaxed). At 8 feet (96 inches) the best size is about 60–80 inches. Choose My seat → best TV size to do it for you.
Is the TV size measured with the frame?
No. The size is the diagonal of the visible screen only. The TV itself is a little bigger.
How close can I sit to a 4K TV?
About 0.78 × the screen size. For a 65 inch 4K TV that is about 4 feet 3 inches (1.3 m). Closer than that, you start to see single pixels.
How many centimetres is a 55 inch TV?
The diagonal is 55 × 2.54 = 139.7 cm. The screen is about 122 cm wide and 68 cm tall. See 55 Inch TV Dimensions.
Related tools
- 55 Inch TV Dimensions — the most popular size, measured
- 65 Inch TV Dimensions — width, height and viewing distance
- 75 Inch TV Dimensions — width, height and viewing distance
- 85 Inch TV Dimensions — width, height and viewing distance
- What Is My Screen Resolution — your screen size in pixels
- Ratio Calculator — aspect ratios like 16:9 and 21:9
- Screen Test — check a new TV for dead pixels
