page_title: Square kilometre
section_title: Topographical Map grids
hierarchical_section_title: Square kilometre / Examples of areas of 1 square kilometre / Topographical Map grids
caption_attribution_description: Map of caldey island from 1952 scale one inch to the mile scanned at 600 DPI
context_page_description: Square kilometre or square kilometer, 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
  100 hectares
  It is also approximately equal to:
  0.3861 square miles
  247.1 acres
  Conversely:
  1 m² = 0.000001 km²
  1 hectare = 0.01 km²
  1 square mile = 2.5899km²
  1 acre = about 0.004047km²
  The symbol "km²" means ², square kilometre or kilometre squared and not k, kilo–square metre. For example, 3 km² is equal to 3×² = 3,000,000 m², not 3,000 m².
context_section_description: Topographical map grids are worked out in metres, with the grid lines being 1,000 metres apart.
  1:100,000 maps are divided into squares representing 1 km², each square on the map being one square centimetre in area and representing 1 km² on the surface of the earth.
  For 1:50,000 maps, the grid lines are 2 cm apart. Each square on the map is 2 cm by 2 cm (4 cm²) and represents 1 km² on the surface of the earth.
  For 1:25,000 maps, the grid lines are 4 cm apart. Each square on the map is 4 cm by 4 cm (16 cm²) and represents 1 km² on the surface of the earth.
  In each case, the grid lines enclose one square kilometre.
caption: Part of an Ordnance Survey map, published 1952. The grid lines are at one kilometre intervals giving each square an area of one square kilometre. The map shows that the area of the island is about two square kilometres.
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