km² to sq miles Converter
Unit Converter
Instant · Precise · Universal
23 units available
6 categories total
How to Convert Square Kilometer to Square Mile
To convert km² to mi²: multiply by 0.3861. To hectares: multiply by 100. To acres: multiply by 247.105.
1 km² = 1,000,000 m² = 100 ha = 247.105 acres ≈ 0.3861 mi².
For example, 1 Square Kilometer (km²) = 0.3861021585 Square Mile (mi²).
Square Kilometer to Square Mile — Common Values
| Square Kilometer (km²) | Square Mile (mi²) |
|---|---|
| 0.1 | 0.03861021585 |
| 0.5 | 0.1930510793 |
| 1 | 0.3861021585 |
| 2 | 0.7722043171 |
| 5 | 1.930510793 |
| 10 | 3.861021585 |
| 25 | 9.652553964 |
| 50 | 19.30510793 |
| 100 | 38.61021585 |
| 500 | 193.0510793 |
| 1000 | 386.1021585 |
About Square Kilometer (km²)
Definition
The square kilometer is a metric unit of area equal to 1,000,000 square meters, or a square with sides of 1 kilometer.
Mathematical Relationship
1 km² = 1,000,000 m² = 100 ha = 247.105 acres ≈ 0.3861 mi².
Conversion Formula
To convert km² to mi²: multiply by 0.3861. To hectares: multiply by 100. To acres: multiply by 247.105.
Practical Applications
Country areas, national park sizes, city footprints, forest coverage, and watershed boundaries.
Interesting Facts
Vatican City = 0.44 km². Manhattan = 59.1 km². Russia = 17,098,242 km² (largest country). Earth's surface = 510,072,000 km².
Common Mistakes
Thinking 1 km² = 1,000 m² (it's actually 1,000,000 m²). Area scales as the square of the linear dimension.
Educational Tips
1 km = 1,000 m, but 1 km² = 1,000² m² = 1,000,000 m². Always square the conversion factor for area.
About Square Mile (mi²)
Definition
The square mile is an imperial unit of area equal to the area of a square with sides of one mile (2.59 km²).
Mathematical Relationship
1 mi² = 640 acres = 27,878,400 ft² = 2.59 km² = 259 ha.
Conversion Formula
To convert mi² to km²: multiply by 2.59. To acres: multiply by 640. To hectares: multiply by 259.
Practical Applications
City areas, county sizes, population density, land surveys, and geographic comparisons.
Interesting Facts
Manhattan is about 22.8 mi². The state of Texas is 268,596 mi². Rhode Island (smallest US state) is 1,214 mi².
Common Mistakes
1 mi ≈ 1.609 km, but 1 mi² ≈ 2.59 km² (not 1.609). Area conversion squares the factor.
Educational Tips
1 mi² = 640 acres. This 'section' (640 acres) is the basis of the US Public Land Survey System grid.