How big is a 55 inch TV?

A 55" TV (16:9) is about 121.8cm (47.9") wide and 68.5cm (27") tall. This is the screen size; the actual unit is slightly larger with bezels.

What size TV should I buy?

Sit 1.5-2.5× the screen diagonal away. For 4K TVs, you can sit closer (1-1.5×). Larger rooms need bigger screens.

TV Size (diagonal inches)

Common TV Sizes

Size	Width (in)	Height (in)	Width (cm)	Height (cm)	Min Distance (ft)

4K TVs: Sit 1–1.5× the screen diagonal. For a 55" TV, sit 4.5–7 feet away.

1080p TVs: Sit 1.5–2.5× the screen diagonal for optimal clarity.

General rule: The TV should fill 30–40° of your field of view for a cinematic experience.