Square Kilometre (km²)
The square kilometre (km²) is the area of a square with 1 km sides: 1 000 000 m², or 100 hectares.
Symbol: km² (ASCII: km2)
Quantity: area
SI relation: 1 km² = 1000000 m² (exact)
Derivation: 1 km² = (1000 m)² = 10⁶ m² = 100 ha
Exact: yes, by definition
Typical uses
- City, lake and country areas
- Catchment and land-use maps
- Population density (people per km²)
Convert square kilometres to other units
| Conversion | 1 km² equals | Reverse |
|---|---|---|
| square kilometre to square meter | 1000000 m² | square meter to square kilometre |
| square kilometre to square centimeter | 10000000000 cm² | square centimeter to square kilometre |
| square kilometre to square foot | 10763910.42 ft² | square foot to square kilometre |
| square kilometre to square inch | 1550003100 in² | square inch to square kilometre |
| square kilometre to hectare | 100 ha | hectare to square kilometre |
| square kilometre to acre | 247.1053815 ac | acre to square kilometre |
| square kilometre to square millimeter | 1000000000000 mm² | square millimeter to square kilometre |
| square kilometre to square yard | 1195990.046 yd² | square yard to square kilometre |
| square kilometre to square mile | 0.3861021585 mi² | square mile to square kilometre |
Open the Area Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Square Kilometre (km²). Retrieved October 25, 2026, from https://scientificconverters.com/units/square-kilometer/
IEEE
Scientific Converters, "Square Kilometre (km²)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/square-kilometer/