Square kilometer

A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. It is the SI unit of area. It is abbreviated m².

A square metre is equal to:

• 0.000 001 square kilometre (km²)
• 10 000 square centimetres (cm²)
• 0.000 1 hectares
• 0.01 ares
• 0.000 247 105 381 acres
• 1.195 990 square yards
• 10.763 911 square feet
• 1 550.003 1 square inches

Square kilometre

1 km² is equal to:

• the area of a square measuring 1 kilometre on each side
• 1 000 000 m²
• 100 hectares
• 0.386 102 square miles (statute)
• 247.105 381 acres

Conversely:

• 1 m² = 0.000 001 km²
• 1 hectare = 0.01 km²
• 1 square mile = 2.589 988 km²
• 1 acre = 0.004 047 km²

Note: "km²" means square kilometre and not kilo–square metre. For example, 3 km² is equal to 3 000 000 m² and not to 3 000 m².

Square megametre

Square megametres are not widely used; however, there are a number of "megametre fans" who think that this unit is very convenient for measuring oceans and continents.

1 Mm² is equal to:

• the area of a square measuring 1 megametre on each side
• 1 000 000 000 000 m²
• 100 000 000 hectares
• 1 000 000 km²

See also

• SI
• SI prefix
• metre
• 1 E0 m²
• Conversion of units
• orders of magnitude