1 square mile = 2.58999 square kilometers
Convert square miles to square kilometers.
Both directions on one page — swap the units and the whole thing runs backwards.
Type a value, or “5cm to in”
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The formula
km² = mi² × 2.58999
Worked through with a real value: 10 square miles = 25.8999 square kilometers.
Going the other way: mi² = km² × 0.386102, so 1 square kilometer = 0.386102 square miles.
What each unit is
- square mile mi²
- A million square yards, used for regional areas and maps in countries using imperial units.
- square kilometer km²
- A million square metres, and the unit used to describe land areas and map scales in most countries.
Where these come from
- 1 square mile = 2589988.110336 square meters
- 1 square kilometer = 1000000 square meters
Every other number on this page is computed from those, and each category is pinned to conversions worked out by hand from the units' primary definitions before it ships.
Conversion tables
| square miles (mi²) | square kilometers (km²) |
|---|---|
| 1 | 2.58999 |
| 2 | 5.17998 |
| 3 | 7.76996 |
| 4 | 10.36 |
| 5 | 12.9499 |
| 6 | 15.5399 |
| 7 | 18.1299 |
| 8 | 20.7199 |
| 9 | 23.3099 |
| 10 | 25.8999 |
| 20 | 51.7998 |
| 25 | 64.7497 |
| 50 | 129.499 |
| 75 | 194.249 |
| 100 | 258.999 |
| square kilometers (km²) | square miles (mi²) |
|---|---|
| 1 | 0.386102 |
| 2 | 0.772204 |
| 3 | 1.15831 |
| 4 | 1.54441 |
| 5 | 1.93051 |
| 6 | 2.31661 |
| 7 | 2.70272 |
| 8 | 3.08882 |
| 9 | 3.47492 |
| 10 | 3.86102 |
| 20 | 7.72204 |
| 25 | 9.65255 |
| 50 | 19.3051 |
| 75 | 28.9577 |
| 100 | 38.6102 |
Questions
How many square kilometers are in a square mile?
1 square mile = 2.58999 square kilometers.
How do I convert square miles to square kilometers?
Use km² = mi² × 2.58999. For example, 10 square miles = 25.8999 square kilometers.
How many square miles are in one square kilometer?
1 square kilometer = 0.386102 square miles.
What is 10 square miles in square kilometers?
10 square miles = 25.8999 square kilometers.
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