21 inch TV dimensions
10.3"
(26.2 cm)
(53.3 cm)
Dimensions
| inches | cm | |
|---|---|---|
| Width: | 18.3 | 46.5 |
| Height: | 10.3 | 26.2 |
| Area: | 188 sq in | 1212.9 cm² |
Size and Fit
A 21 inch TV has a width of 18.3 inches (46.5 cm), a height of 10.3 inches (26.2 cm), and a viewing area of 188 square inches (1212.9 square cm). This size works well for close-range desk use, kitchens, small counters, or compact secondary screens.
Recommended Viewing Distance
Based on SMPTE-style viewing angles: 1.5-2.5x diagonal for 1080p content and 0.75-1.5x diagonal for 4K. For 8K screens, the close-range estimate uses 0.375-0.75x diagonal.
Pixel Density (PPI)
PPI compares screen resolution with diagonal size. Higher PPI means a sharper image at close range.
| Resolution | Pixels | PPI on 21" | Perceived quality |
|---|---|---|---|
| HD 720p | 1280 x 720 | 70 | Sharp |
| Full HD 1080p | 1920 x 1080 | 105 | Sharp |
| 4K UHD | 3840 x 2160 | 210 | Sharp |
Recommended Room Size
Room length uses the maximum 1080p viewing distance plus 1 m of seating clearance. Room width uses 3x TV width so the display does not dominate the space.
Compare Nearby Sizes
Neighboring sizes help show how much width, height, and screen area change around 21 inches.
Will It Fit?
Use the screen width as the hard minimum. Extra clearance gives the display 3 inches per side on a stand or 6 inches per side on a wall.