Square kilometer

1 square kilometer is composed of 100 ha (hectareas).

The square kilometer is the unit of surface, or area, that corresponds to a square with a side of one kilometer. It is equivalent to one million square meters. In the International System of Units (SI), its symbol is km²: it does not admit a point, capital letter, or plural (see spelling rules for SI symbols).

Conversions

1 km² is equal to:

• 1 000 000 m2
• 100 ha
• 0.386 102 square miles
• 247,105 381 acres

Reciprocally:

• 1 m2 = 0,000 001 km2 (also) 1×10⁻⁶km2)
• 1 ha = 0.01 km2 (also) 1×10⁻²km2)
• 1 mile square = 2.589 988 km2
• 1 acre = 0.004 047 km2

Order of magnitude

• The Vatican City, the smallest country in the world, measures 0.44 km2.
• Monaco, the second smallest country in the world, measures 1,95 km2.
• Nauru, the third smallest country in the world, measures 21,3 km2.

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  The Vatican City, 0.44 km2.

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  Tromelin Island in the Indian Ocean, 1 km2.

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  Angkor Wat Prison 1 km2.

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  Monaco, 1,95 km2.

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  Retiro Park of Madrid,

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  Kiribati, 810 km2.