Square Kilometers to Square Miles (km² to mi²)
1 square kilometer equals 0.38610216 square miles — multiply the number of square kilometers by 0.38610216 to convert. So 10 km² is 3.8610216 mi² and 100 km² is 38.610216 mi².
The formula
To convert square kilometers to square miles, multiply by the exact factor:
square miles = square kilometers × 0.38610216
For example, 50 km² × 0.38610216 = 19.305108 mi². To reverse it, divide square miles by 0.38610216 (or multiply by 2.589988).
Conversion table
| Square kilometers (km²) | Square miles (mi²) |
|---|---|
| 1 | 0.38610216 |
| 2 | 0.77220432 |
| 5 | 1.9305108 |
| 10 | 3.8610216 |
| 25 | 9.652554 |
| 50 | 19.305108 |
| 100 | 38.610216 |
| 500 | 193.05108 |
| 1000 | 386.10216 |
How to convert online
Live and instant:
- Type the number of square kilometers into the first box.
- Read the square-mile value instantly in the second box.
- Or enter a square-mile value to convert back — it works both ways.
Use the Square Kilometer to Square Mile Converter — free and instant in your browser.
Where this conversion is used
Square kilometers are the metric standard for regional areas, while square miles are used for US and UK land, counties and map scales. This conversion is common when comparing the size of cities, national parks or countries across metric and imperial sources.
FAQ
How many square miles are in a square kilometer?
One square kilometer equals 0.38610216 square miles. Multiply km² by 0.38610216 — 10 km² = 3.8610216 mi².
What is the formula to convert square kilometers to square miles?
Square miles = km² × 0.38610216. The converter applies this exact factor automatically.
How do I convert square miles back to square kilometers?
Divide by 0.38610216, or multiply by 2.589988. So 1 mi² ≈ 2.59 km².
Is the conversion exact?
Yes — it derives from the exact mile-to-kilometer definition, so results are precise to the digits shown.
Related converters
- Square Mile to Square Kilometer Converter
- Square Kilometer to Square Meter Converter
- Square Kilometer to Acre Converter
- Square Kilometer to Hectare Converter
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