Formula
km² to mi² conversion formula
Use this relationship for a direct conversion:
mi² = km² x 0.386102158542
Worked example
2 km² = 0.7722043171 mi².
Values derived from exact metric and international length definitions.
Area conversion
Convert Square kilometer to Square mile
1 square kilometer (km²) equals 0.386102158542 square mile (mi²). Enter any value below to convert from km² to mi².
Enter a value and choose units. Results update instantly.
1 km² = 0.3861021585 mi²
All Area units
From 1 km²| Unit | Value |
|---|---|
| Square meter m² | 1,000,000 |
| Square kilometer km² | 1 |
| Square centimeter cm² | 10,000,000,000 |
| Square millimeter mm² | 1e12 |
| Square inch in² | 1,550,003,100.0062000751 |
| Square foot ft² | 10,763,910.4167097211 |
| Square yard yd² | 1,195,990.0463010804 |
| Square mile mi² | 0.3861021585 |
| Acre ac | 247.1053814672 |
| Hectare ha | 100 |
Recent conversions
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Quick reference
Square kilometer to Square mile table
| Square kilometer (km²) | Square mile (mi²) |
|---|---|
| 0.01 | 0.0038610216 |
| 0.1 | 0.0386102159 |
| 1 | 0.3861021585 |
| 2 | 0.7722043171 |
| 5 | 1.9305107927 |
| 10 | 3.8610215854 |
| 25 | 9.6525539636 |
| 50 | 19.3051079271 |
| 100 | 38.6102158542 |
| 1,000 | 386.1021585424 |
From unit
About the square kilometer
One million square meters.
Symbol: km²
To unit
About the square mile
The area of a square one mile on each side.
Symbol: mi²
Keep converting
Related conversions
Source
Conversion standard
Definitions are checked against NIST SP 811: Area units. Calculations use full internal precision before display rounding.
View the complete area converterQuestions
km² to mi² FAQ
How do you convert square kilometer to square mile?
Use the formula mi² = km² x 0.386102158542. 1 square kilometer (km²) equals 0.386102158542 square mile (mi²).
Is the km² to mi² conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.