Square kilometers to Square miles Converter
Convert square kilometers to square miles. The formula used here is 1 square kilometer = 0.386102158542 square miles. The formula is mi² = km² × 0.386102158542; 1 km² is 0.386102 mi².
A metric area unit used for cities, regions, and large parcels.
A US customary and imperial area unit for regions and large land parcels.
Start with your value in square kilometers, then apply the formula below. It stays visible so you can catch rounding mistakes instead of just copying the output.
For property and construction decisions, carry the converted area with the source unit, rounding rule, and any assumptions about measured boundaries.
Area conversions square the underlying length scale, so small changes in length can become larger changes in area for large rooms or parcels. This page displays converted values with up to 6 decimal places by default.
| Square kilometers | Square miles |
|---|---|
| 1 km² | 0.386102 mi² |
| 10 km² | 3.861022 mi² |
| 100 km² | 38.610216 mi² |
Useful for real-estate, land, and property records. Use the same formula with your exact input if the measurement needs to be documented.
Useful for flooring, paint, and construction estimates. Use the same formula with your exact input if the measurement needs to be documented.
Useful for mapping, agriculture, and site planning. Use the same formula with your exact input if the measurement needs to be documented.
How do I convert square kilometers to square miles?
Enter the value in square kilometers and apply mi² = km² × 0.386102158542. Round the square miles result after the conversion, not before.
What is 1 square kilometer in square miles?
1 km² equals 0.386102 mi² with the current rounding setting. Keep more decimal places when the result feeds another calculation.
What is 10 km² in mi²?
10 km² is 3.861022 mi². It appears in the lookup table so you can compare it with nearby amounts.
Can I convert square miles back to square kilometers?
Yes. Use the reverse Square miles to Square kilometers converter if you need to go the other direction.
How accurate is this square kilometers to square miles conversion?
The calculator runs the formula in your browser and rounds results to 6 decimal places by default. Area conversions square the underlying length scale, so small changes in length can become larger changes in area for large rooms or parcels.