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hectometre ( International spelling as used by the International Bureau of Weights and Measures; SI symbol: hm) or hectometer ( American spelling) is an uncommonly used unit of length in the metric system, equal to one hundred metres. It derives from the Greek word "ekato", meaning "hundred". A regulation football or soccer field is approximately 1 hectometre in length.
area the square hectometer (hm 2) is a common unit. It is more commonly known by the name of hectare (ha), meaning 100 ares (100 a). The are is a measurement of area the size of 1 decametre by 1 decametre, which is 10 metres by 10 metres. Hence 100 ares equals an area with dimensions 100 m by 100 m — 1 hectometre by 1 hectometre, the square hectometre — equalling 10,000 square metres (10,000 m 2) For
volumes the cubic hectometre (hm 3) is also used, 100 m by 100 m by 100 m equalling 1,000,000 cubic metres (1,000,000 m 3).
Click on the thumbnail image to jump to the desired Human-scale
order of length magnitude
article: top-left is 1E-6 m, lower-right is 1E5 m.
The Pyramid of Cheops is 138.8 metres high.
To compare different
orders of magnitude this page lists lengths between 100 metres and 1000 metres (1 kilometre).
Distances shorter than 100 metres
Conversions [ edit ]
100 metres (sometimes termed a hectometre) is equal to:
feet one side of a
1 hectare square a fifth of a modern
li, a Chinese unit of measurement the approximate distance travelled by light in 300
Human-defined scales and structures [ edit ]
100 metres —
wavelength of the highest mediumwave radio frequency, 3 MHz 100 metres — Spacing of
location marker posts on British motorways. 138.8 metres — height of the
Great Pyramid of Giza (Pyramid of Cheops) 139 metres — height of the world's tallest roller coaster,
Kingda Ka [2 ] 187 metres— shortest wavelength of the broadcast
radio AM band, 1600 kHz 202 metres — length of the Széchenyi Chain Bridge connecting
Buda and Pest 320.75 metres — height of the
Eiffel Tower(including antenna) [3 ] 328 metres — height of
Auckland's Sky Tower, the tallest free-standing structure in the Southern Hemisphere 341 metres — height of the world's tallest bridge, the
Millau Viaduct 390 metres — height of the
Empire State Building 400–800 metres — approximate heights of the
world's tallest skyscrapers of the past 80 years. 458 metres — length of the
Knock Nevis, the world's largest supertanker 555 metres — longest wavelength of the broadcast
radio AM band, 540 kHz 630 metres — height of the
KVLY-TV mast, second tallest structure in the world. 646 metres — height of the
Warsaw radio mast, the world's tallest structure until its collapse in 1991. 828 metres — height of
Burj Khalifa, world's tallest structure on 17 January 2009 [4 ] 1000 metres — wavelength of the lowest
mediumwave radio frequency, 300 kHz
Astronomical [ edit ]
Distances longer than 1 kilometre