How many square miles are in 1 square kilometer?

1 square kilometer equals 0.386102 mi².

How do I convert square miles back to square kilometers?

Use the reverse converter: 1 square mile equals 2.58999 km².

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

To convert square kilometers to square miles, multiply the value by 0.386102159.

mi² = km² × 0.386102159

90 km² × 0.386102159 = 34.75 mi²

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

How do I convert square kilometers to square miles?: To convert square kilometers to square miles, multiply the value by 0.386102159.
How many square miles are in 1 square kilometer?: 1 square kilometer equals 0.386102 mi².
How many square miles are in 10 square kilometers?: 10 km² equals 3.86102 mi².
How do I convert square miles back to square kilometers?: Use the reverse converter: 1 square mile equals 2.58999 km².
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.