1 decametre

A Blue whale has been measured as 33 metres long; this drawing compares its length to that of a human diver and a dolphin

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

Distances shorter than 10 metres

Conversions

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

• 10 metres
• 100 decimetres
• 1,000 centimetres
• 10,000 millimetres
• 32.8 feet
• side of square with area 100 m²

Human-defined scales and structures

• 10 metres — wavelength of the highest shortwave radio frequency, 30 MHz
• 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 MHz
• 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 transport aircraft
• 100 metres — wavelength of the lowest shortwave radio frequency, 3 MHz

Sports

• 11 metres — approximate width of a doubles tennis court
• 18 metres — distance between the pitcher's rubber and home plate on a baseball field^{[Citation needed]}
• 20 metres — length of cricket pitch (22 yards)^{[Citation needed]}
• 27.43 metres (90 feet) — distance between bases on a baseball field
• 49 metres — width of an American football field (53 1/3 yards)
• 70 metres — width of soccer field
• 91 metres — length of American football field (100 yards, measured between the goal lines)

Nature

• 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,^[1] 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^{[Citation needed]}

Astronomical

• 30 metres — diameter of 1998 KY₂₆, a rapidly spinning meteoroid

Distances longer than 100 metres

See also

Click on the thumbnail image to jump to the desired Human-scale order of length magnitude article: top-left is 1E-6m, lower-right is 1E5m.

Notes