How to convert square kilometers to square miles
To convert square kilometers to square miles, multiply by 0.386102158542. Area conversions are essential for real estate, flooring, land surveys, farming and map reading.
Square Kilometer to Square Mile conversion table
| Square Kilometer (km²) | Square Mile (mi²) |
|---|---|
| 0.1 km² | 0.0386102158542 mi² |
| 0.5 km² | 0.193051079271 mi² |
| 1 km² | 0.386102158542 mi² |
| 2 km² | 0.772204317085 mi² |
| 3 km² | 1.15830647563 mi² |
| 4 km² | 1.54440863417 mi² |
| 5 km² | 1.93051079271 mi² |
| 10 km² | 3.86102158542 mi² |
| 20 km² | 7.72204317085 mi² |
| 25 km² | 9.65255396356 mi² |
| 50 km² | 19.3051079271 mi² |
| 100 km² | 38.6102158542 mi² |
| 500 km² | 193.051079271 mi² |
| 1,000 km² | 386.102158542 mi² |
About the units
Square Kilometer (km²)
A square kilometer equals 1,000,000 m² and measures cities, lakes and countries.
Square Mile (mi²)
A square mile equals 640 acres, or about 2.59 square kilometers.
How to use this converter
- Type the number of square kilometers (km²) in the input box.
- The result in square miles appears instantly — no button needed.
- See the same value in every other area unit just below.
- Use “Swap units” to convert square miles back to square kilometers.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many square miles are in one square kilometer?
One square kilometer equals 0.386102158542 square miles. 0.386102158542 is the exact factor used by this converter.
How do I convert square kilometers to square miles?
Multiply the value in square kilometers by 0.386102158542. To go the other way, multiply square miles by 2.58998811034.
What is 10 km² in mi²?
10 km² = 3.86102158542 mi². Also, 5 km² = 1.93051079271 mi² and 100 km² = 38.6102158542 mi².
What is the difference between a square kilometer and a square mile?
A square kilometer equals 1,000,000 m² and measures cities, lakes and countries. A square mile equals 640 acres, or about 2.59 square kilometers.
Is this tool free and private?
Yes — the Square Kilometer to Square Mile is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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