1 rd | 1 perch of length | 1 pole | 16.5 feet | 198 inches | 5.5 yards | 5.029 meters | 502.9 cm (centimeters)

1 perch of length | 1 rd 1 pole | 1 rd 1 ft | 0.06061 rd 1 in | 0.005051 rd 1 yd | 0.1818 rd 1 m | 0.1988 rd 1 cm | 0.001988 rd

length

distance

width

height

thickness

depth

radius

diameter

wavelength

perimeter

characteristic length

circumference

position

breadth

arc length

displacement

radial distance

semi-principal axis length

atomic radius

angular wavelength

mean free path

Cartesian coordinate

displacement vector

UK imperial | UK imperial length | UK imperial linear | US Customary System (USCS) | US customary length | US linear | international yard and pound agreement | Canadian

Light travel time t in vacuum from t = x/c: | 17 ns (nanoseconds)

Light travel time t in an optical fiber t = 1.48x/c: | 25 ns (nanoseconds)

Optical power P from P = 1/f: | 0.2 D (diopters)

Distance to horizon (ignoring topography and other obstructions) from this height: | 4.977 miles | 8.01 km (kilometers) | 8010 meters

Angular wavelength ƛ from ƛ = λ/(2π): | 0.8004 meters

Frequency ν of electromagnetic radiation in a vacuum from ν = c/λ: | 60 MHz (megahertz)

Frequency ν of sound from ν = v/λ: | 68 Hz (hertz) | (assuming speed of sound ≈ 340 m/s)

Spectroscopic wavenumber ν^~ from ν^~ = 1/λ: | 0.002 cm^(-1) (reciprocal centimeters) | 0.002 wavenumbers

Wavenumber k from k = 2π/λ: | 0.01249 cm^(-1) (reciprocal centimeters)

Corrresponding angle θ around the earth's equator from θ = s/a_ earth : | 789 nrad (nanoradians) | 4.518×10^-5° (degrees) | 0.1626" (arcseconds)

Wavelength λ from λ = 2πƛ: | 31.6 meters

Frequency ν of a photon in a vacuum from ν = 2πc/ƛ: | 374.5 MHz (megahertz)

≈ 3 × total length of DNA in a single human cell ( ≈ 2 m )

≈ 6.2 × length of an average human step ( 68.96 to 97.44 cm )

≈ (0.8 to 1.2) × height of a typical adult giraffe ( 13.1 to 19.7 ft )

≈ 1.2 × height of the London Routemaster double-decker bus ( 14.33 ft )

≈ (1.2 to 1.8) × story ( 9 to 14 ft )

≈ (0.3 to 292.9) × wavelength of an audible sound to a human ( 5×10^-5 to 0.05 speed of sound/Hz )

≈ 0.92 × sound wavelength at 63 Hz (first octave) in air at 21 °C ( ≈ 5.46 m )