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Square kilometre
Kilometre

The kilometre , symbol km is a Units of measurement of length in the metric system, equal to one thousand metres.Slang terms for kilometre include click and kay ....
 (U.S.
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 spelling: square kilometer), symbol km2, is a decimal multiple of the SI
Si

Si, si, or SI may refer to :...
 unit
Units of measurement

The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day....
 of surface area
Surface area

Surface area is how much exposed area an object has. It is expressed in square units. If an object has flat Face , its surface area can be calculated by adding together the areas of its faces....
, the square metre
Square metre

The square metre is the SI derived unit of area, with symbol m?. It is defined as the area of a square whose sides measure exactly one metre....
, one of the SI derived unit
SI derived unit

SI derived units are part of the SI system of measurement Units of measurements and are derived from the seven SI base units.Note that while the names of all SI units are in lowercase, the symbols of units named after people are written with an initial capital letter ....
s.






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Square kilometre
Kilometre

The kilometre , symbol km is a Units of measurement of length in the metric system, equal to one thousand metres.Slang terms for kilometre include click and kay ....
 (U.S.
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 spelling: square kilometer), symbol km2, is a decimal multiple of the SI
Si

Si, si, or SI may refer to :...
 unit
Units of measurement

The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day....
 of surface area
Surface area

Surface area is how much exposed area an object has. It is expressed in square units. If an object has flat Face , its surface area can be calculated by adding together the areas of its faces....
, the square metre
Square metre

The square metre is the SI derived unit of area, with symbol m?. It is defined as the area of a square whose sides measure exactly one metre....
, one of the SI derived unit
SI derived unit

SI derived units are part of the SI system of measurement Units of measurements and are derived from the seven SI base units.Note that while the names of all SI units are in lowercase, the symbols of units named after people are written with an initial capital letter ....
s. 1 km2 is equal to:

  • 1,000,000 m
    Metre

    The metre or meter is a Unit of measurement of length. It is the SI base unit of length in the metric system and in the International System of Units , used around the world for general and scientific purposes....
    2
  • 100 ha (hectare
    Hectare

    A hectare is a unit of area equal to , or one square hectometre , and commonly used for surveying.The hectare is used in most countries around the world, especially in domains concerned with land ownership, land planning, and land management, including law , agriculture, forestry, and town planning....
    )
  • 0.386102 square mile
    Square mile

    The square mile is an Imperial system and US customary system of measure for an area equal to the area of a square of one mile. It should not be confused with miles square, which refers to the number of miles on each side squared....
    s
  • 247.105381 acre
    Acre

    The acre is a Units of measurement of area in a number of different systems, including the Imperial unit#Measures of area and United States customary units#Units of area systems....
    s


Conversely:

  • 1 m2 = 0.000 001 (10-6) km2
  • 1 hectare = 0.01 (10-2) km2
  • 1 square mile = 2.589 988 km2
  • 1 acre = 0.004 047 km2, 0.404 7 ha or 4047 m2


Note: "km2" means (km)2, square kilometre or kilometre squared, and not k(m2), kilo–square metre. For example, 3 km2 is equal to 3 × (1,000 m)2 = 3,000,000 m2, not 3,000 m2.

Comparative order


The 106 m2 orders of magnitude page gives comparisons with geographic areas.

A hectare (104 m2) is less than a square kilometer which is less than a square megametre (1012 m2).

Source


See also

  • Conversion of units
    Conversion of units

    Conversion of units refers to conversion factors between different units of measurement for the same quantity....
    .
  • SI prefix
    SI prefix

    An SI prefix is a name or associated symbol that precedes a basic unit of measure to form a decimal multiple . The abbreviation SI is from the French language name Syst?me International d?Unit?s ....
     for the precise meaning of the prefix "k"
 
  • Square Kilometre Array
    Square Kilometre Array

    The Square Kilometre Array is a radio telescope in development which will have a total collecting area of approximately one square kilometre. It will operate over a wide range of frequencies and its size will make it 50 times more sensitive than any other radio instrument....
    , a proposed radio telescope
    Radio telescope

    A radio telescope is a form of Directional antennae radio Antenna used in radio astronomy and in tracking and collecting data from satellites and space probes....

    which is intended to have a collecting area of approximately one square kilometre.
    		•