Convert Square Mile to Square Kilometer
Live bidirectional calculator for Square Miles (sq mi) and Square Kilometers (km²) with verified formula and conversion charts.
Area10 units
How the Calculation Works (Linear Scaling)
Since 1 Square Mile = 2.589988 Square Kilometers, multiply the value in Square Miles by 2.589988.
Square Mile to Square Kilometer Conversion Table
Precomputed values for quick reference and printing.
| Square Mile | Square Kilometer |
|---|---|
| 1 sq mi | 2.59 km² |
| 2 sq mi | 5.18 km² |
| 3 sq mi | 7.77 km² |
| 4 sq mi | 10.36 km² |
| 5 sq mi | 12.9499 km² |
| 6 sq mi | 15.5399 km² |
| 7 sq mi | 18.1299 km² |
| 8 sq mi | 20.7199 km² |
| 9 sq mi | 23.3099 km² |
| 10 sq mi | 25.8999 km² |
| 15 sq mi | 38.8498 km² |
| 20 sq mi | 51.7998 km² |
| 25 sq mi | 64.7497 km² |
| 30 sq mi | 77.6996 km² |
| 40 sq mi | 103.5995 km² |
| 50 sq mi | 129.4994 km² |
| 75 sq mi | 194.2491 km² |
| 100 sq mi | 258.9988 km² |
| Square Kilometer | Square Mile |
|---|---|
| 1 km² | 0.3861 sq mi |
| 2 km² | 0.7722 sq mi |
| 3 km² | 1.1583 sq mi |
| 4 km² | 1.5444 sq mi |
| 5 km² | 1.9305 sq mi |
| 6 km² | 2.3166 sq mi |
| 7 km² | 2.7027 sq mi |
| 8 km² | 3.0888 sq mi |
| 9 km² | 3.4749 sq mi |
| 10 km² | 3.861 sq mi |
| 15 km² | 5.7915 sq mi |
| 20 km² | 7.722 sq mi |
| 25 km² | 9.6526 sq mi |
| 30 km² | 11.5831 sq mi |
| 40 km² | 15.4441 sq mi |
| 50 km² | 19.3051 sq mi |
| 75 km² | 28.9577 sq mi |
| 100 km² | 38.6102 sq mi |
About Square Mile (sq mi)
The area of a square with sides of 1 statute mile, equal to 640 acres (≈ 2.589988 km²).
History: Traditional land survey section unit used throughout the US Public Land Survey System.
Common Uses: County sizes, state and municipal geographic land areas in the US.
About Square Kilometer (km²)
One million square meters (10⁶ m²), representing a square with sides of 1,000 meters (1 km).
History: Adopted worldwide for geographic, geopolitical, and territory mapping.
Common Uses: Country surface areas, national parks, lake sizes, and municipal zoning.
❓ Frequently Asked Questions
How many Square Kilometers are in 1 Square Mile?
There are exactly 2.589988 Square Kilometers in 1 Square Mile (1 sq mi = 2.589988 km²).
What is the formula to convert Square Mile to Square Kilometer?
The formula is: Square Kilometer = Square Mile × 2.589988. Since 1 Square Mile = 2.589988 Square Kilometers, multiply the value in Square Miles by 2.589988.
How do I convert 1 sq mi to km² manually?
To convert 1 sq mi to km²: apply the formula Square Kilometer = Square Mile × 2.589988. Substituting gives: 1 × 2.589988 = 2.59 km².