1 sq mi
2.59 km²
Square Miles to Square km Converter (Square Miles to Square Kilometers)
1 square mile = 2.58998811 square kilometers. To convert sq mi to km², multiply by 2.58998811.
1 km²
0.3861 sq mi
10 sq mi
25.8999 km²
100 sq mi
258.9988 km²
How to convert Square Miles to Square km
1 square mile equals 2.58998811 square kilometers, so the conversion is a single multiplication.
km² = sq mi × 2.58998811
Example: 2 sq mi × 2.58998811 = 5.18 km².
1 square mile in every area unit
Acres640 ac
Square Feet27,878,400 sq ft
Square Meters2,589,988.11 m²
Hectares258.999 ha
Square Kilometers2.59 km²Square Yards3,097,600 sq yd
Square Inches4,014,489,600 sq in
Square Centimeters25,899,881,103.36 cm²
Square Millimeters2,589,988,110,336 mm²
Ares25,899.881 a
Related conversions
Calculators
Square Miles to Square km FAQ
How many square kilometers are in a square mile?
1 square mile = 2.58998811 square kilometers.
How many square miles are in a square kilometer?
1 square kilometer = 0.3861021585 square miles.
How do I convert sq mi to km²?
Use km² = sq mi × 2.58998811. For example, 10 sq mi = 25.9 km².
Can I print this Square Miles to Square km chart?
Yes. Use "Print / Save PDF" next to the converter for a one-page chart, or "Download CSV" to open it in Excel or Google Sheets.