Square kilometre (U.S. spelling: square kilometer), 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)

Conversely:

• 1 m² = 0.000 001 (10^?6) km²
• 1 hectare = 0.01 (10^?2) km²
• 1 square mile = 2.589 988 km²
• 1 acre = 0.004 047 km², 0.404 7 ha or 4047 m²

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 × (1,000 m)² = 3,000,000 m², not 3,000 m².

Comparative order

The 10⁶ m² orders of magnitude page gives comparisons with geographic areas.

A hectare (10⁴ m²) is less than a square kilometer which is less than a square megametre (10¹² m²).

Source

See also

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