55" 4K vs 55" Full HD: same size, different resolution.
Verdict
At 55", 4K shows more detail up close; 1080p is still acceptable at typical couch distance. For streaming and broadcast, 4K is the better future-proof choice. Prefer 1080p only if you need a budget option and sit far enough that the difference is minimal.
Physical Size Comparison
Relative physical size of each display at scale (same units as your selection).
55" 4K TV
55" Full HD TV
55" 4K TV
in
DIAG55.0 in
W×H47.9 × 27.0 in
cm
DIAG139.7 cm
W×H121.8 × 68.5 cm
55" Full HD TV
in
DIAG55.0 in
W×H47.9 × 27.0 in
cm
DIAG139.7 cm
W×H121.8 × 68.5 cm
Pixel Workspace Comparison
Effective pixel workspace with 1x/2x scaling. Shows how much logical space you get on each display.