The square kilometre (red square) compared to other areas, including a square mile (the entire yellow square)
General information
Unit system
SI units
Unit of
area
Symbol
km2
Conversions
1 km2in ...
... is equal to ...
SI units
1000000 m2
100 ha
Imperial/US
0.3861 sq mi
247.1 acres
The square kilometre (square kilometer in American spelling; symbol: km2) is a multiple of the square metre, the SI unit of area or surface area.
1 km2 is equal to:
1,000,000 square metres (m2)
100 hectares (ha)
It is also approximately equal to:
0.3861 square miles [2]
247.1 acres [3]
Conversely:
1 m2 = 0.000001 (10−6) km2
1 hectare = 0.01 (10−2) km2
1 square mile = 2.5899 km2[4]
1 acre = about 0.004047 km2[5]
The symbol "km2" means (km)2, square kilometre or kilometre squared and not k(m2), kilo–square metre. For example, 3 km2 is equal to 3×(1,000m)2 = 3,000,000 m2, not 3,000 m2.
^ abcd"UnitConversion.org Area Converter". web page. UnitConversion.org. 2009. Retrieved 4 July 2012.
^There are 0.386102159 international square miles in a square kilometer while there are 0.386100614 US Survey square miles in the same measure. This is because the US Survey measures are very slightly larger than the international measures.[1]
^There are 247.105381467 international acres in a square kilometre while there are only 247.104393047 of the very slightly larger US Survey acres.[1]
^An International square mile equals 2.58998811 km2 while the slightly larger US Survey square mile equals 2.58999847 km2.[1]
^1 acre (International) = 0.004046856 km2 while 1 acre (US Survey) = 0.004046873 km2[1]
The squarekilometre (square kilometer in American spelling; symbol: km2) is a multiple of the square metre, the SI unit of area or surface area. 1 km2...
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Global Information