Square Kilometers to Square Miles Converter
1 square kilometer ≈ 0.386102159 square miles
1 square kilometer equals 0.386102 square miles
How to convert square kilometers to square miles
Area factors are squared length factors: 1 ft² = (0.3048 m)². The acre here uses international feet; historic US survey acres differ slightly.
mi² = km² × 0.3861021585One square kilometer is 0.3861021585 square miles, so a single multiplication converts any value.
3.86102 mi² ≈ 10 × 0.3861021585Square kilometers to square miles conversion table
Common values in square kilometers, converted to square miles.
| Square kilometers (km²) | Square miles (mi²) |
|---|---|
| 1 | 0.38610216 |
| 2 | 0.77220432 |
| 3 | 1.1583065 |
| 4 | 1.5444086 |
| 5 | 1.9305108 |
| 10 | 3.8610216 |
| 20 | 7.7220432 |
| 25 | 9.652554 |
| 50 | 19.305108 |
| 100 | 38.610216 |
| 250 | 96.52554 |
| 500 | 193.05108 |
| 1,000 | 386.10216 |
About these units
square kilometerkm²
One million square metres. Used for land area and geographic regions.
square milemi²
Exactly 640 acres. Used for county and country areas.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.