How to convert square kilometres to square miles
mi² = km² × 0.3861021585
Example: 5 km² × 0.3861021585 = 1.930510793 mi²
Square Kilometers to Square Miles table
| Square Kilometers (km²) | Square Miles (mi²) |
|---|---|
| 0.5 km² | 0.19305108 mi² |
| 1 km² | 0.38610216 mi² |
| 2 km² | 0.77220432 mi² |
| 3 km² | 1.1583065 mi² |
| 4 km² | 1.5444086 mi² |
| 5 km² | 1.9305108 mi² |
| 6 km² | 2.316613 mi² |
| 7 km² | 2.7027151 mi² |
| 8 km² | 3.0888173 mi² |
| 9 km² | 3.4749194 mi² |
| 10 km² | 3.8610216 mi² |
| 15 km² | 5.7915324 mi² |
| 20 km² | 7.7220432 mi² |
| 25 km² | 9.652554 mi² |
| 30 km² | 11.583065 mi² |
| 40 km² | 15.444086 mi² |
| 50 km² | 19.305108 mi² |
| 75 km² | 28.957662 mi² |
| 100 km² | 38.610216 mi² |
| 250 km² | 96.52554 mi² |
| 500 km² | 193.05108 mi² |
| 1,000 km² | 386.10216 mi² |
About these units
Square Kilometers (km²): A square kilometre is 1,000,000 m² or 100 hectares, used for the area of cities, lakes and countries.
Square Miles (mi²): A square mile is 640 acres, about 2.59 km². It is used for large land areas in the US and UK.
Frequently asked questions
How many square miles are in 1 square kilometre?
1 square kilometre (km²) equals 0.3861021585 square miles (mi²).
How do I convert km² to mi²?
Multiply the value in square kilometres by 0.3861021585. For example, 5 km² × 0.3861021585 = 1.930510793 mi².
How do I convert square miles back to square kilometres?
Multiply by 2.58998811 (or divide by 0.3861021585). 1 mi² = 2.58998811 km².
What is a square kilometre?
A square kilometre is 1,000,000 m² or 100 hectares, used for the area of cities, lakes and countries.
Conversion factors come from exact international definitions (NIST SP 811, BIPM) where they exist. Results show up to 10 significant digits. Need every area unit at once? Use the Area Converter.