A 55″ TV is 121.7 cm wide and 68.5 cm tall (screen only, 16:9).
A 55-inch TV has a screen diagonal of 139.7 cm. It is the most popular TV size in the world — a practical middle ground between the compact 50-inch and the more commanding 65-inch. The 121.7 cm width fits most standard TV units and most living room walls without difficulty.
The dimensions above are for the screen only. Add 3–5 cm per side for the bezel when planning shelf or wall space. Always check the manufacturer's spec sheet for exact product dimensions if you are cutting a hole in furniture or installing a wall bracket.
Use the calculator below to verify dimensions for any size, or compare with adjacent sizes in the table.
Common sizes:
| Measurement | Centimetres | Inches |
|---|---|---|
| Width | 121.7 cm | 47.9 in |
| Height | 68.5 cm | 27.0 in |
| Diagonal | 139.7 cm | 55.0 in |
| Size (inches) | Diagonal (cm) | Width (cm) | Height (cm) | Min distance |
|---|---|---|---|---|
| 43″ | 109.2 cm | 95.2 cm | 53.5 cm | 1.6 m |
| 50″ | 127.0 cm | 110.7 cm | 62.3 cm | 1.9 m |
| 55″ | 139.7 cm | 121.7 cm | 68.5 cm | 2.1 m |
| 65″ | 165.1 cm | 143.9 cm | 80.9 cm | 2.5 m |
| 75″ | 190.5 cm | 166.0 cm | 93.4 cm | 2.9 m |
| 85″ | 215.9 cm | 188.2 cm | 105.8 cm | 3.2 m |
A 55 inch TV with a 16:9 aspect ratio is 121.7 cm wide and 68.5 cm tall, measured screen only. These figures come from the diagonal measurement (139.7 cm) and the 16:9 width-to-height ratio. The full unit — including the plastic or metal bezel — is typically 125–130 cm wide depending on the model. Always check the manufacturer's specification sheet for exact product dimensions before planning shelf or wall space.
The recommended viewing distance for a 55 inch TV is between 2.1 m and 3.5 m. This range is based on the standard guideline of 1.5× to 2.5× the screen diagonal (139.7 cm). For 4K Ultra HD content you can comfortably sit at 2.1 m — the high pixel density prevents visible pixelation at close range. For HD content or if the room setup means you sit further away, 2.5–3.0 m is a comfortable standard distance. A 55-inch TV at 4–5 metres may feel small; consider a 65 or 75 inch instead.
55 inches equals 139.7 cm. This is the diagonal measurement of the screen panel — the standard way all TV sizes are quoted. The width of a 55-inch 16:9 TV is 121.7 cm (47.9 inches) and the height is 68.5 cm (27.0 inches). To convert any TV size from inches to cm, multiply by 2.54. For example, 55 × 2.54 = 139.7 cm.
A 55 inch TV works well in living rooms where you sit 2–3.5 metres from the screen. It is the most popular TV size sold globally, which reflects how well it fits most standard room sizes. If your sofa is more than 3.5 metres from the TV wall, a 65-inch screen will fill your field of view better. For bedrooms or smaller spaces where you sit less than 2 metres away, a 50 or 43 inch may be more comfortable. The 55-inch size is a reliable default for medium-sized living rooms.