1 decametre

A clickable mosaic of objects
at scales within direct human experience, from the micrometric (10⁻⁶ m, top left) to the multi-kilometric (10⁵ m, bottom right).

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
• 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

Sports

• 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)

Nature

• 10 metres – average length of human digestive tract
• 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
• 40 metres – average depth beneath the seabed of the Channel tunnel
• 52 metres – height of Niagara Falls^[4]

Astronomical

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

Distances longer than 100 metres

Notes