1 decametre

To help compare different orders of magnitude this page lists lengths between 10 metres and 100 metres.

Conversions

10 metres (very rarely termed a decametre which is abbreviated as dam) is equal to:

10 metres – wavelength of the highest shortwave radio frequency, 30 M Hz
23 metres – height of the obelisk of the Place de la Concorde, Paris, France.
25 metres – wavelength of the broadcast radio shortwave band at 12 M Hz
29 metres – height of the lighthouse at Savudrija, Slovenia.
31 metres – wavelength of the broadcast radio shortwave band at 9.7 MHz
34 metres – height of the Split Point Lighthouse in Aireys Inlet, Victoria, Australia.
40 metres – average depth beneath the seabed of the Channel tunnel
49 metres – wavelength of the broadcast radio shortwave band at 6.1 MHz
55 metres – height of the Leaning Tower of Pisa
60 metres – height of Pyramid of Djoser^{[citation needed]}
64 metres – wingspan of a Boeing 747-400
70 metres – length of the Bayeux Tapestry
70 metres – width of a typical football field
88.40 metres – wingspan of the Antonov An-225 Mriya transport aircraft
100 metres – wavelength of the lowest shortwave radio frequency, 3 MHz

11 metres – approximate width of a doubles tennis court
15 metres – width of a standard FIBA basketball court
15.24 metres – width of an NBA basketball court (50 feet)
18.44 metres – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches)^[1]
20 metres – length of cricket pitch (22 yards)^[2]
27.43 metres – distance between bases on a baseball field (90 feet)
28 metres – length of a standard FIBA basketball court
28.65 metres – length of an NBA basketball court (94 feet)
49 metres – width of an American football field (53⅓ yards)
59.436 metres – width of a Canadian football field (65 yards)
70 metres – typical width of soccer field
91 metres – length of American football field (100 yards, measured between the goal lines)
105 metres – length of football pitch (UEFA Stadium Category 3 and 4)

10 metres – average length of human digestive tract^{[citation needed]}
12 metres – length of a whale shark, largest living fish
12 metres – wingspan of a Quetzalcoatlus, a pterosaur
13 metres – length of a giant squid and colossal squid, the largest living invertebrates
15 metres – approximate distance the tropical circles of latitude are moving towards the equator and the polar circles are moving towards the poles each year due to a natural, gradual decrease in the Earth's axial tilt
18 metres – height of a Sauroposeidon, the tallest known dinosaur
20 metres – length of a Leedsichthys, the largest known fish ever lived
21 metres – height of High Force waterfall in England
33 metres – longest measured length of a blue whale,^[3] the largest animal on earth, living or extinct, in terms of mass
35 metres – length of a Supersaurus, the longest known dinosaur and longest vertebrate^{[citation needed]}
40 metres – average depth beneath the seabed of the Channel tunnel^{[citation needed]}
52 metres – height of Niagara Falls^[4]

^ "Rule 1.04 The Playing Field" (PDF). Official Baseball Rules. Major League Baseball. 25 January 2010. pp. 1–5. Archived from the original (PDF) on 27 April 2011. Retrieved 1 April 2011. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help) See especially Diagram No. 1, page 3.
^ "Law 7 (The pitch)". Laws of Cricket. Marylebone Cricket Club. October 2010. Archived from the original on 14 May 2011. Retrieved 1 April 2011. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
^ "Animal Records". Smithsonian National Zoological Park. Archived from the original on 25 April 2009. Retrieved 29 May 2007. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
^ "Niagara Falls Geology Facts & Figures". Niagara Parks Commission. Retrieved 29 June 2011.