How to Convert Square Miles to Square Kilometers
Converting square miles to square kilometers is useful for US geographic to international metric comparisons.
1.00 Square Miles = 2.5900 Square Kilometers
To convert square miles to square kilometers, multiply by 2.58998811. One square mile equals exactly 2.58998811 square kilometers.
Step-by-Step
- Start with your value: 1.00 Square Miles
- Multiply by 2.58998811
- Result: 2.5900 Square Kilometers
Formula: km² = mi² × 2.58998811
💡 Memory Tip: 1 mi² = 640 acres = 2.59 km². Washington DC is about 68 mi². Manhattan is about 22.8 mi².
Square Miles to Square Kilometers Quick Reference
| Square Miles | Square Kilometers | Common Reference |
|---|---|---|
| 1 | 2.59 | Small town |
| 5 | 12.9499 | Large town |
| 10 | 25.8999 | City district |
| 50 | 129.4994 | Medium suburb |
| 100 | 258.9988 | Large suburb |
Understanding Square Miles and Square Kilometers
What is a Square Mile?
A square mile (mi²) is an imperial unit of area equal to the area of a square with sides of one mile. It equals approximately 2.59 km² or 640 acres. Square miles are used in the US and UK for measuring cities, counties, and large geographic areas.
What is a Square Kilometer?
A square kilometer (km²) is a metric unit of area equal to 1,000,000 square meters or 100 hectares. It is used for measuring large geographic areas such as cities, lakes, national parks, and countries.
Learn more about Square Miles on Wikipedia →
Key Facts
- 1 Square Mile = 2.58998811 Square Kilometers
- 1 Square Kilometer = 0.386102158542 Square Miles
- mi² is the symbol for Square Miles
- km² is the symbol for Square Kilometers
Key Conversion Facts
- 1 Square Mile = 2.58998811 Square Kilometers
- 1 Square Kilometer = 0.386102158542 Square Miles
- Formula: km² = mi² × 2.58998811
- Reverse formula: mi² = km² × 0.386102158542
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Frequently Asked Questions
1 Square Miles equals 2.5900 Square Kilometers. Multiply by 2.58998811.
km² = mi² × 2.58998811
For 1 Square Miles: 1 × 2.58998811 = 2.5900 km²
Multiply your square miles value by 2.58998811. For a quick estimate, use 2.59 as the multiplier. Example: 1 mi² × 2.59 ≈ 2.59 km² (exact: 2.5900).
1 Square Kilometer = 0.386102158542 Square Miles. To convert square kilometers back to square miles, multiply by 0.386102158542.
A square mile (mi²) is an imperial unit of area equal to the area of a square with sides of one mile. It equals approximately 2.59 km² or 640 acres. Square miles are used in the US and UK for measuring cities, counties, and large geographic areas.