Square kilometer (km²)
A square one kilometer on each side.
What is a square kilometer?
- Symbol
- km²
- Quantity
- Area
- Unit system
- SI
- Definition
- A square one kilometer on each side.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for the area of cities, lakes, countries and other large regions.
Square kilometer in other area units
- 1 km² = 1000000000000 mm²Square millimeter
- 1 km² = 10000000000 cm²Square centimeter
- 1 km² = 1000000 m²Square meter
- 1 km² = 100 haHectare
- 1 km² ≈ 1550003100 in²Square inch
- 1 km² ≈ 10763910.42 ft²Square foot
- 1 km² ≈ 1195990.046 yd²Square yard
- 1 km² ≈ 247.1053815 acAcre
- 1 km² ≈ 0.3861021585 mi²Square kilometer to Square mile converter
Square kilometer quick reference
| Square kilometer | Square mile | Square meter | Square foot |
|---|---|---|---|
| 1 km² | ≈ 0.3861021585 mi² | = 1000000 m² | ≈ 10763910.42 ft² |
| 10 km² | ≈ 3.861021585 mi² | = 10000000 m² | ≈ 107639104.2 ft² |
| 100 km² | ≈ 38.61021585 mi² | = 100000000 m² | ≈ 1076391042 ft² |
| 1000 km² | ≈ 386.1021585 mi² | = 1000000000 m² | ≈ 10763910420 ft² |
Where the square kilometer fits
The next smaller area unit is the hectare (ha). 1 km² = 100 ha, and 1 ha = 0.01 km².
The next larger area unit is the square mile (mi²). 1 km² ≈ 0.3861021585 mi², and 1 mi² = 2.589988110336 km².
Frequently asked questions
- How many square miles are in one square kilometer?
- One square kilometer ≈ 0.3861021585 mi² (square miles).
- How many square meters are in one square kilometer?
- One square kilometer = 1000000 m² (square meters).
- How many square feet are in one square kilometer?
- One square kilometer ≈ 10763910.42 ft² (square feet).