21 inches

TV & monitor size

16.4 x 13.12 in

Aspect ratio 4:3

Aspect ratio 5:4

Aspect ratio 16:9

Aspect ratio 16:10

Aspect ratio 21:9

Aspect ratio 32:9

Metric

  • Kilometre (km)
    4.17×10⁻⁴ x 3.33×10⁻⁴
  • Metre (m)
    0.42 x 0.33
  • Decimetre (dm)
    4.17 x 3.33
  • Centimetre (cm)
    41.65 x 33.32
  • Millimetre (mm)
    416.52 x 333.21
  • Micrometre (µm)
    416,515.42 x 333,212.34
  • Nanometre (nm)
    416,515,422.96 x 333,212,338.37
  • Angstrom (Å)
    4.17×10⁹ x 3.33×10⁹

British/American

  • League
    8.63×10⁻⁵ x 6.9×10⁻⁵
  • Mile (mi)
    2.59×10⁻⁴ x 2.07×10⁻⁴
  • Furlong
    2.07×10⁻³ x 1.66×10⁻³
  • Chain
    0.02 x 0.02
  • Rod (rd)
    0.08 x 0.07
  • Yard (yd)
    0.46 x 0.36
  • Foot (ft)
    1.37 x 1.09
  • Link
    2.07 x 1.66
  • Hand
    4.1 x 3.28
  • Inch (in)
    16.4 x 13.12
  • Line
    163.98 x 131.19
  • Mil (mil)
    16,398.24 x 13,118.6
  • Thou (thou)
    16,398.24 x 13,118.6

Nautical

  • Nautical mile
    2.25×10⁻⁴ x 1.8×10⁻⁴
  • Fathom
    0.23 x 0.18

Astronomical

  • Parsec (pc)
    1.35×10⁻¹⁷ x 1.08×10⁻¹⁷
  • Light year
    4.4×10⁻¹⁷ x 3.52×10⁻¹⁷
  • Astronomical unit (AE)
    2.78×10⁻¹² x 2.23×10⁻¹²
  • Light minute
    2.32×10⁻¹¹ x 1.85×10⁻¹¹
  • Light second
    1.39×10⁻⁹ x 1.11×10⁻⁹