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1 hectometre =
SI units
0.10000 km 100.00 m
US customary / Imperial units
109.36 yd 328.08 ft

The 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.

  • For area the square hectometer (hm2) 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 m2)
  • For volumes the cubic hectometre (hm3) is also used, 100 m by 100 m by 100 m equalling 1,000,000 cubic metres (1,000,000 m3).
1 E-6 m - Click on the relevant thumbnail image to jump to the desired Human-scale order of length magnitude: top-left is 1e-6m, bottom-right is 1e5m. 1 E-5 m 1 E-4 m 1 E-3 m 1 E-2 m 1 E-1 m 1 E0 m 1 E1 m 1 E2 m 1 E3 m 1 E4 m 1 E5 m
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.
British driver location sign and location marker post on the M27 in Hampshire. The location marker posts are installed at 100-metre intervals[1]

To compare different orders of magnitude this page lists lengths between 100 metres and 1000 metres (1 kilometre).

Distances shorter than 100 metres


100 metres (sometimes termed a hectometre) is equal to:

  • 328 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 nanoseconds.

Human-defined scales and structures[edit]




Distances longer than 1 kilometre


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  5. ^ The Laws of The Game
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  7. ^ Fujiwara, Akira; et al (2 June 2006). "The Rubble-Pile Asteroid Itokawa as Observed by Hayabusa". Science 312 (5778): 1330–1334. doi:10.1126/science.1125841. PMID 16741107. Archived from the original on 2 April 2009. Retrieved 2009-04-20.