Square kilometre, symbol km2, is a decimal multiple of the SI unit of surface area, the square metre, one of the SI derived units. 1 km2 is equal to:
- 1,000,000 m2
- 100 ha (hectare)
It is also approximately equal to:
- 0.3861 square miles
- 247.1 acres
Conversely:
- 1 m2 = 0.000001 (10−6) km2
- 1 hectare = 0.01 (10−2) km2
- 1 square mile = 2.5899km2
- 1 acre = about 0.004047km2, 0.4047ha or 4047 m2
2.47 acres/ha
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×(1,000m)2 = 3,000,000 m2, not 3,000 m2.
Note also that if a piece of land, say a large park, is described as five kilometres square, that means it has the shape of a square, each side of the square being five kilometres long. This means that the park has an area of twenty-five square kilometres (and not five square kilometres).
Famous quotes containing the word square:
“After the planet becomes theirs, many millions of years will have to pass before a beetle particularly loved by God, at the end of its calculations will find written on a sheet of paper in letters of fire that energy is equal to the mass multiplied by the square of the velocity of light. The new kings of the world will live tranquilly for a long time, confining themselves to devouring each other and being parasites among each other on a cottage industry scale.”
—Primo Levi (1919–1987)