Area
km² to square miles Converter
1 km² = 0.3861 mi². Enter any value and the result updates instantly.
Convert
How to convert km² to square miles
- Type the km² value in the calculator.
- Keep km² selected as the from unit and square miles selected as the to unit.
- Use the instant result, or copy it with the copy button.
km² to square miles chart
| km² | square miles |
|---|---|
| 1 km² | 0.3861 mi² |
| 2 km² | 0.7722 mi² |
| 5 km² | 1.9305 mi² |
| 10 km² | 3.861 mi² |
| 25 km² | 9.6526 mi² |
| 50 km² | 19.3051 mi² |
| 100 km² | 38.6102 mi² |
Formula
mi² = km² x 0.386102158542
Example: 1 km² = 0.3861 mi².
Source
Area units derived from exact length definitions; acre and hectare factors are fixed.
Common questions
How do I convert km² to square miles?
Enter the km² value in the converter, or multiply by the factor shown in the formula. 1 km² = 0.3861 mi².
What is 1 km² = 0.3861 mi²?
1 km² = 0.3861 mi². The chart on this page gives more common km² to square miles values.
Where does this area conversion come from?
Area units derived from exact length definitions; acre and hectare factors are fixed. ConverterBase uses stable definitions and fixed conversion factors, not live or rounded market data.