How to use Sq Miles to Sq Km
- Type a value in square miles.
- The result in square kilometers appears instantly.
- Type in the second box to convert the other way.
How to convert square miles to square kilometers
Multiply the value in square miles by 2.59. Formula: km² = mi² × 2.59. Example: 10 mi² × 2.59 = 25.8999 km².
Common square miles to square kilometers conversions
5 mi² = 12.9499 km². 25 mi² = 64.7497 km². 50 mi² = 129.4994 km². 100 mi² = 258.9988 km².
Where is mi² to km² conversion used?
Area conversions are common in real estate (flat and plot sizes in square feet or square meters), farming and land records (acres and hectares), flooring and tiling estimates, and painting or construction quotes.
What are square miles?
A square mile is the area of a 1 mile × 1 mile square, equal to 640 acres or about 2.59 km². It is used for city and country sizes in the US and UK.
What are square kilometers?
A square kilometer is the area of a 1 km × 1 km square, equal to 100 hectares. It is used for the size of cities, countries, lakes and parks.
Square miles to square kilometers conversion table
| Square miles (mi²) | Square kilometers (km²) |
|---|---|
| 1 | 2.59 |
| 2 | 5.18 |
| 5 | 12.9499 |
| 10 | 25.8999 |
| 20 | 51.7998 |
| 50 | 129.4994 |
| 100 | 258.9988 |
| 200 | 517.9976 |
| 250 | 647.497 |
| 500 | 1,294.99 |
| 1,000 | 2,589.99 |
| 1,500 | 3,884.98 |
| 2,000 | 5,179.98 |
| 5,000 | 12,949.94 |
| 10,000 | 25,899.88 |
Frequently asked questions
How many square kilometers are in 1 square mile?
1 square mile = 2.59 square kilometers (1 mi² = 2.59 km²).
How many square miles are in 1 square kilometer?
1 square kilometer = 0.386102 square miles (1 km² = 0.386102 mi²).
What is 10 mi² in square kilometers?
10 mi² = 25.8999 km².
What is 100 mi² in square kilometers?
100 mi² = 258.9988 km².
Is the mi² to km² conversion exact?
Yes. Area factors come from exact length definitions (1 ft = 0.3048 m), so square feet, acres and hectares convert exactly. Results are rounded only for display.
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