How many square kilometers are in 1 square mile?

1 square mile equals 2.58999 km².

How do I convert square kilometers back to square miles?

Use the reverse converter: 1 square kilometer equals 0.386102 mi².

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert square miles to square kilometers, multiply the value by 2.58998811.

km² = mi² × 2.58998811

90 mi² × 2.58998811 = 233.1 km²

Square Mile (mi²): Used for large land areas in the US and UK. Equal to 640 acres.
Square Kilometer (km²): Used for the area of countries, cities and lakes. Equal to one million square metres.

How do I convert square miles to square kilometers?: To convert square miles to square kilometers, multiply the value by 2.58998811.
How many square kilometers are in 1 square mile?: 1 square mile equals 2.58999 km².
How many square kilometers are in 10 square miles?: 10 mi² equals 25.8999 km².
How do I convert square kilometers back to square miles?: Use the reverse converter: 1 square kilometer equals 0.386102 mi².
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.